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Photoreforming of plastic waste into valuable products and hydrogen using a high-entropy oxynitride with distorted atomic-scale structure

T0 review · 3 major / 5 minor · reviewed 2026-08-11 · deepseek-v4-flash

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Pith's one-line read A high-entropy oxynitride with nitrogen-distorted atomic bonds outperforms its oxide counterpart for sunlight-driven conversion of PET plastic into hydrogen, formic acid, and acetic acid.

desk verdict The HEON/HEO activity gap is a genuine new result, but the EXAFS-based vacancy mechanism is underdetermined and needs a revision. read the letter →

arxiv 2412.18722 v1 pith:7EDZV5GZ submitted 2024-12-25 cond-mat.mtrl-sci physics.chem-ph

Ho Truong Nam Hai , Thanh Tam Nguyen , Maiko Nishibori , Tatsumi Ishihara , Kaveh Edalati This is my paper · ORCID
classification cond-mat.mtrl-sciphysics.chem-ph
keywords high-entropyoxynitridephotoreformingPETplasticwastehydrogenproductionformicacidhigh-pressuretorsionoxygenvacanciesX-rayabsorptionspectroscopy
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

Plastic waste can be split by sunlight and water into hydrogen and small organic acids if a photocatalyst does its job well. This paper argues that a high-entropy oxynitride — a ceramic built from five metals (titanium, zirconium, hafnium, niobium, tantalum) plus oxygen and nitrogen — is such a catalyst for polyethylene terephthalate (PET). Adding nitrogen to the corresponding high-entropy oxide roughly doubles the hydrogen produced in four hours (1.63 versus 0.84 mmol per gram) and also yields formic acid and acetic acid, while the oxide gives only formic acid. The authors attribute the improvement to nitrogen-induced distortion of the local atomic structure, which narrows the optical bandgap from 3.2 eV to about 1.5 eV and suppresses electron-hole recombination. The catalyst retains nearly all of its activity after four cycles, so the work points to entropy-stabilized oxynitrides as durable low-bandgap photoreforming materials.

What carries the argument

The load-bearing object is the high-entropy oxynitride (HEON), a five-cation Ti-Zr-Hf-Nb-Ta ceramic with mixed O/N anions, made by arc melting, high-pressure torsion, oxidation, and ammonia nitriding. The mechanism that carries the argument is nitrogen-induced local atomic distortion: X-ray absorption spectroscopy shows that nitrogen changes the coordination environment of Ti and Nb, expands Zr and Ta bonds, contracts Hf bonds, and lowers the binding energy of Ti, Nb, and Ta, while reduced first-shell EXAFS amplitudes are interpreted as additional oxygen vacancies around Ti, Nb, and Ta. These distortions, combined with N-$2p$/O-$2p$ hybridization, narrow the bandgap and suppress photogenerated electron-hole recombination, so more electrons reach the surface to reduce water to H$_2$ and more holes oxidize PET to formic and acetic acid. The dual-phase monoclinic/face-centered-cubic microstructure, with dislocation-like defects, supplies additional strain and defect sites.

What would settle it

Quantitative EXAFS fitting of the Ti, Nb, and Ta first shells in both materials, with Debye-Waller factors treated explicitly, would settle the vacancy question: unchanged coordination numbers with larger disorder would falsify the vacancy interpretation, while genuinely lower coordination numbers would support it. An independent oxygen-vacancy probe, such as positron annihilation or O K-edge X-ray absorption, would give a second test.

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Extended reading notes

Core claim

This work reports the first use of a high-entropy oxynitride for photoreforming plastic waste. The central claim is that nitrogen incorporation into a Ti-Zr-Hf-Nb-Ta high-entropy oxide creates a distorted local structure around titanium and niobium — the elements that dominate the conduction-band minimum — while lengthening Zr-O/N and Ta-O/N bonds, shortening Hf-O/N bonds, and lowering the binding energy of Ti, Nb, and Ta. These changes, together with hybridization of O-$2p$ and N-$2p$ orbitals and oxygen vacancies around Ti, Nb, and Ta, narrow the bandgap from 3.2 eV to about 1.5 eV and reduce radiative electron-hole recombination. On PET in strongly alkaline solution under a xenon lamp, the oxynitride releases 1.63 mmol/g H$_2$ versus 0.84 mmol/g for the oxide in 4 h, produces 0.814 mmol/g formic acid and 0.215 mmol/g acetic acid (the oxide produces 0.38 mmol/g formic acid and no acetic acid), and retains about 99% of its hydrogen evolution after four cycles. The authors conclude that high-entropy oxynitrides combine low bandgap, high stability, and useful activity for converting plastic waste into fuels and chemicals.

Load-bearing premise

The paper's mechanism rests on reading the smaller first-shell X-ray absorption peaks around titanium, niobium, and tantalum as extra oxygen vacancies, but those peaks also shrink when atoms become more disordered, and the paper does not separate the two effects; if disorder is the real cause, the vacancy-based explanation weakens even though the activity gap between oxide and oxynitride remains.

Editorial extensions

If this is right

  • PET photoreforming over the HEON produces 1.63 mmol/g H$_2$ in 4 h, about twice the 0.84 mmol/g produced by the corresponding HEO.
  • The HEON oxidizes PET to 0.814 mmol/g formic acid and 0.215 mmol/g acetic acid, whereas the HEO gives 0.38 mmol/g formic acid and no detectable acetic acid.
  • Nitrogen incorporation narrows the bandgap from about 3.2 eV to 1.5 eV and removes the photoluminescence peak seen for the HEO, indicating much weaker radiative electron-hole recombination.
  • Scavenger tests indicate that electrons and holes, rather than free hydroxyl radicals, are the essential reactive species: electrons reduce water to H$_2$ and holes drive PET oxidation.
  • The catalyst keeps about 99% of its hydrogen yield over four reaction cycles with no detectable change in XRD, Raman, or SEM, indicating stability under strongly alkaline photoreforming conditions.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the vacancy/distortion mechanism is right, other anion substitutions in five-cation oxides — sulfur, phosphorus, or different N/O ratios — should also reshape the conduction band and could be screened with the same XAS-plus-bandgap workflow.
  • The material's surface area is only 2.3 m2/g, so nanostructuring or porous versions of the same composition are a direct test of whether the measured yields are surface-limited; higher surface area could push rates well above the reported values.
  • Because precipitated terephthalate is filtered out before NMR, the reported carbon balance is incomplete; a mass-balance experiment that accounts for the solid terephthalate would show whether formic and acetic acid are the dominant soluble products or only a fraction.
  • A cleaner mechanistic test would compare the HEON against an oxide with the same ~1.5 eV bandgap obtained by a different chemical route; if the oxide matched the H$_2$ yield, bandgap narrowing would be the key factor, and if not, the nitrogen-induced distortion would be.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The paper reports the synthesis of a Ti-Zr-Hf-Nb-Ta high-entropy oxynitride (HEON) by nitriding the corresponding high-entropy oxide (HEO), and evaluates both materials for the photoreforming of polyethylene terephthalate (PET) into H2, formic acid, and acetic acid. Under identical conditions, the HEON yields 1.63 mmol/g H2 versus 0.84 mmol/g for the HEO after 4 h, with higher formic and acetic acid production, and retains ~99% activity over four cycles. The authors attribute the improved performance to nitrogen-induced lattice distortion, a narrowed bandgap (1.5 eV vs 3.2 eV), and reduced electron-hole recombination, supported by XRD, TEM, XANES/EXAFS, UV-Vis, photoluminescence, and photocurrent measurements. The paper presents a plausible empirical advance but the mechanistic chain connecting nitrogen substitution to oxygen vacancies to enhanced activity is not uniquely established by the data.

Significance. If the activity difference is robust, this is a valuable demonstration of high-entropy oxynitrides for plastic-waste photoreforming, and the direct HEO-versus-HEON comparison under identical conditions is a clean experimental benchmark that does not reduce to prior fits or simulations. The stability test over 16 h and the quantitative NMR-based product analysis with an internal standard are additional strengths. However, the central mechanistic claim—that nitrogen-induced oxygen vacancies and lattice distortion create the active sites—rests on an underdetermined EXAFS interpretation, and the headline quantitative comparison lacks error bars. The paper is therefore significant but currently overclaims the causal explanation.

major comments (3)
  1. [Section 3.2, sixth point; Section 4] The interpretation of the reduced first-shell FT-EXAFS amplitudes at the Ti K-, Nb K-, and Ta L3-edges as evidence for increased oxygen-vacancy concentrations is not uniquely determined. Because the HEON contains 20.6 at% N, the first coordination shell is an O/N mixture, and N substitution alone lowers the backscattering amplitude even at constant coordination number; static and thermal disorder (Debye-Waller factors) also reduce FT amplitudes. No shell-by-shell EXAFS fits, coordination numbers, Debye-Waller parameters, or uncertainty estimates are reported, so 'increased oxygen vacancies' is one of several equally consistent explanations. Since Section 4 uses these vacancies as the structural origin of the active sites, the mechanistic chain is not established by the data as presented.
  2. [Section 3.4, Fig. 7a] The central quantitative claim—1.63 mmol/g H2 for the HEON versus 0.84 mmol/g for the HEO—is presented without replicate experiments, error bars, or a statistical test. Given that this factor-of-two difference is the headline result, at least triplicate runs with standard deviations (or an explicit statement of the number of runs) are needed to support the claim that the HEON is more active than the HEO.
  3. [Sections 3.4 and 4] The specific surface area of the HEO is not reported, while that of the HEON (2.3 m2/g) is given and used in the literature comparison. If the two materials differ substantially in surface area, the mass-normalized activity comparison is not a clean test of the electronic-structure advantage; the per-surface-area activities could rank differently. Please report BET surface areas for both materials or otherwise rule out a surface-area effect.
minor comments (5)
  1. [Table 1, first row] The listed 'Reaction time: 3 h' and the derived rates (0.543 mmol/h.g H2, 0.271 mmol/h.g formic acid, 0.072 mmol/h.g acetic acid) are inconsistent with the 4 h reaction time used in Figs. 7 and 8 and with the reported total yields (1.63, 0.814, and 0.215 mmol/g); the table should be corrected or the discrepancy explained.
  2. [Section 3.1, Fig. 1b] The Rietveld refinement is reported only as phase fractions and lattice parameters; adding reliability factors (Rwp, χ2) would allow readers to judge the quality of the fit.
  3. [Section 3.3, Fig. 6e] The authors state that the comparison of photocurrent intensity is 'hard due to the difference in their behavior in bonding to the FTO glass,' yet the shape differences are used to support the reduced-recombination claim. A more controlled photocurrent measurement (e.g., normalized loading) would strengthen this inference, or the claim should be softened.
  4. [Section 4] In the phrase 'the replacement of O2 sites with N3 sites,' the anion charges should be written as O2- and N3-.
  5. [Section 3.1] The particle size distribution '0.3 to 205.0 μm with a mean particle size of 20.6 ± 0.5 μm' would benefit from a statement of the number of measurements or the distribution width, since DLS mean values without distribution parameters are difficult to interpret.

Circularity Check

0 steps flagged · score 2.0 of 10

No significant circularity: the HEO-versus-HEON activity comparison is an independent experimental benchmark; self-citations are contextual, not load-bearing.

full rationale

The central claim is a direct head-to-head experiment reported in Section 3.4: 'The H2 production of the HEON is two times higher than that of the HEO (1.63 mmol/g versus 0.84 mmol/g), confirming that the addition of nitrogen to the HEO and the production of the HEON is effective.' This is an independent experimental benchmark under identical conditions, not a quantity derived from any fitted parameter or from the authors' prior work. The optical and electronic claims are likewise supported by measurements made in this paper (Section 3.3): the HEON bandgap of about 1.5 eV versus 3.2 eV for the HEO, the XPS VBM values, the photocurrent response, and the photoluminescence data. Self-citations [15, 35, 53, 69] are used to rationalize why nitrogen narrows the bandgap and why Ti/Nb influence the conduction band, but these citations are contextual support rather than the source of the present activity result or band-structure measurements. No uniqueness theorem is invoked, and no external benchmark is replaced by a self-citation. The paper also honestly notes a limitation in the photocurrent comparison ('the comparison of photocurrent intensity for these two materials is hard due to the difference in their behavior in bonding to the FTO glass'), which weakens a sub-claim but is not circularity. The weakest point is mechanistic rather than circular: the decreased EXAFS first-shell amplitudes around Ti, Nb, and Ta are interpreted as increased oxygen vacancies (Section 3.2, sixth point), but static/thermal disorder and O/N backscattering changes could also contribute; this is an underdetermined interpretation of measured data, not a fitted input renamed as a prediction. Because self-citations appear in the interpretation but the central HEO-versus-HEON comparison does not reduce to them, the circularity score is low.

Assumptions & free parameters 0 free parameters · 4 assumptions · 0 invented entities

No numerical model is fitted and no new physical entities are introduced. The paper relies on standard spectroscopy interpretation rules, a direct-gap assumption, and a correlational mechanistic chain from XAS features to catalytic activity.

assumptions (4)
  • domain assumption XANES and EXAFS peak shifts and amplitude changes are interpreted using standard coordination and bonding rules from cited references.
    Used throughout Section 3.2 to convert spectral features into bond-length, symmetry, and oxygen-vacancy statements without independent structural fitting.
  • domain assumption The bandgap is assumed to be direct and is analyzed by Kubelka-Munk extrapolation of (alpha*h*nu)^2.
    Section 3.3 and Fig. 6b; no Tauc analysis for indirect transitions or explicit justification of the direct-gap model.
  • domain assumption Photocurrent and photoluminescence differences are attributed to carrier lifetime and recombination despite the acknowledged different FTO adhesion behavior.
    Section 3.3, Fig. 6e-f; the authors state the comparison is difficult due to adhesion differences, making the recombination conclusion less secure.
  • domain assumption The lower average oxidation state inferred from XANES white-line and edge shifts is linked to favorable adsorption strength via Sabatier-type reasoning.
    Section 4; plausible but not directly measured, and no adsorption experiments are provided.

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Pith. "Pith review of Photoreforming of plastic waste into valuable products and hydrogen using a high-entropy oxynitride with distorted atomic-scale structure." pith.science (2026). https://pith.science/paper/7EDZV5GZ

@misc{pith2026241218722,
  author       = {Pith},
  title        = {Pith review of: Photoreforming of plastic waste into valuable products and hydrogen using a high-entropy oxynitride with distorted atomic-scale structure},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/7EDZV5GZ}},
  note         = {Machine review of arXiv:2412.18722}
}
read the original abstract

The persistent existence of plastic waste causes serious problems for the environment, directly and indirectly affecting the health of organisms and humans. Photoreforming is a nature-friendly method that only uses solar energy to convert plastic waste into green hydrogen (H2) and valuable organic products. This study shows that a high-entropy oxynitride (HEON) photocatalyst, synthesized by the addition of nitrogen to a Ti-Zr-Hf-Nb-Ta-containing high-entropy oxide (HEO), exhibits a higher potential for the production of H2, formic acid and acetic acid from polyethylene terephthalate (PET) photoreforming compared to the relevant HEO. Examination of X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) by synchrotron light shows that, in addition to hybridization of 2p orbitals from oxygen and nitrogen, nitrogen atoms distort the structure and completely change the neighborhood of niobium and titanium (a main contributor to the conduction band), expands the atomic bonds of zirconium and tantalum, contracts the atomic bonds of hafnium and decreases the binding energy of titanium, niobium and tantalum. These electronic structure changes lead to a narrower bandgap and diminished electron-hole recombination, enhancing the photoreforming performance. This study introduces HEONs with distorted atomic bond structures as efficient low-bandgap and stable catalysts for transforming plastics into high-value organic chemicals and H2 by photocatalysis.

Figures

Figures reproduced from arXiv: 2412.18722 by the authors.

Figure 1
Figure 1. Structural characterization and particle size distribution of high-entropy oxynitride photocatalyst with dual monoclinic and face-centered cubic phases. (a) XRD profile of HEA and HEO, (b) XRD profile of HEON and corresponding Rietveld analysis, (c) particle size distribution by DLS analysis of HEON, and (d) Raman spectra of HEON taken at four different positions. An HR image by TEM is shown in Fig. 2a, confirming t… view at source ↗
Figure 2
Figure 2. Formation of two phases and significant lattice distortion in high-entropy oxynitride photocatalyst. (a) TEM high-resolution images of nanograins, and (b, c) lattice images of distorted regions containing dislocation-like defects. The elemental distribution in the HEON, shown in Fig. 3a and Fig. 3b using SEM- and STEM￾EDS mappings, indicates that there is a reasonably homogenous distribution of elements at both micr… view at source ↗
Figure 3
Figure 3. Homogeneous distribution of elements in high-entropy oxynitride photocatalyst in micro/nanometer sizes. (a) SEM with EDS mappings, and (b) HAADF image taken by STEM and related EDS mappings for HEON [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figures from the paper (7 more)
Figure 4
Figure 4. Figure 4: Full oxidation states for metals and full reduction states for oxygen and nitrogen in high￾entropy oxynitride photocatalyst. XPS spectra and relevant peak deconvolution analysis for (a) Ti2p, (b) Zr3d, (c) Hf4f, (d) Nb3d, (e) Ta4f, (f) O1s and (g) N1s of HEON [PITH_FU…
Figure 5
Figure 5. Figure 5: The difference in the local atomic structure and vicinity of metals in high-entropy oxynitride and oxide photocatalysts. (a, c, e, g, i) XAS data and (b, d, f, h, j) Fourier-transformed extended X￾ray absorption fine structure spectra for (a, b) Ti K-edge, (c, d) Zr K-…
Figure 6
Figure 6. Figure 6: Wide wavelength light absorbance, low bandgap, proper band structure, high photocurrent generation and small electron-hole recombination of high-entropy oxynitride photocatalyst. (a) UV￾Vis light absorption spectroscopy, (b) Kubelka-Munk bandgap determination graph ( 𝛼…
Figure 7
Figure 7. Figure 7: Catalytic H2 evolution from PET plastic degradation over high-entropy oxynitride and oxide photocatalysts, and the role of reactive species in photoreforming reaction. (a) H2 production versus irradiation time for HEON compared to HEO including blank test. (b) The effe…
Figure 8
Figure 8. Figure 8: Determination of oxidation products from PET plastic photoreforming using high-entropy oxynitride photocatalyst in 10 M NaOD in D2O. 1H NMR spectra (a) without and (b) with maleic acid addition, and (c) concentration of oxidation products from PET degradation after 4 h…
Figure 9
Figure 9. Figure 9: Stability and reusability of high-entropy oxynitride photocatalyst for simultaneous hydrogen evolution and PET plastic photoreforming. (a) Reusability of HEON for H2 production from PET photoreforming in four cycles. (b) XRD profiles and (c) Raman spectra of HEON befor…
Figure 10
Figure 10. Figure 10: The proposed pathway for PET plastic degradation by photoreforming high-entropy oxynitride photocatalyst [PITH_FULL_IMAGE:figures/full_fig_p021_10.png]

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    Introduction The consumption of fossil fuel resources and increasing the level of carbon dioxide ( CO2) emissions worldwide are leading to energy and environmental crises [1]. Hydrogen (H2) is a clean fuel with high energy density (122 kJ/g) which does not emit CO 2 or any other toxic substances, meeting the criteria for a green and sustainable energy car...

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    Reagents Five metals with high purity, titanium 99.9%, zirconium 99%, hafnium 99.7%, niobium 99.9% and tantalum 99.9%, were purchased from Furuuchi Chemical Cooperation, Japan

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Pith tools

Reviewed August 11, 2026 · model on record in the stance chip above.