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REVIEW 4 major objections 5 minor 51 references

Mixed platinum and zirconia powder as electrocatalyst for hydrogen evolution and oxidation reaction

T0 review · 4 major / 5 minor · reviewed 2026-08-07 · deepseek-v4-flash

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Pith's one-line read A platinum-zirconia composite matches pure platinum for alkaline hydrogen reactions.

desk verdict Useful empirical data on Pt@ZrO2 for alkaline HER/HOR, but the mechanistic claim that ZrO2 stabilizes a partially oxidized Pt active state is contradicted by the paper's own CV. read the letter →

arxiv 2506.14819 v1 pith:VXYE7WVU submitted 2025-06-09 physics.chem-ph cond-mat.mtrl-sci

Simone Minelli , Manuel Iozzia , Claudio Piazzoni , Alberto Vertova , Cristina Lenardi , Alessandro Minguzzi This is my paper · ORCID
classification physics.chem-phcond-mat.mtrl-sci
keywords hydrogenevolutionreactionoxidationplatinum-zirconiacompositealkalinewaterelectrolysiselectrochemicalimpedancespectroscopyionbeamsputteringdepositionpartialplatinumchargetransferresistance
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

The paper claims that a mixed platinum and zirconia film, made by ion-beam sputtering and containing less noble metal than a pure platinum film, performs as well as pure platinum for the hydrogen evolution and hydrogen oxidation reactions in alkaline solution, and clearly better than the palladium-zirconia analogue it replaces. The authors report charge-transfer resistances of about 4.0 and 1.5 ohms for Pt@ZrO2 in 0.1 M and 1 M KOH, compared with 3.4 and 1.7 ohms for Pt/FTO and 21.9 and 11.9 ohms for Pd@ZrO2. If true, this would give alkaline electrolysers and fuel cells a cheaper way to use platinum's activity without its full loading.

What carries the argument

The load-bearing object is the Pt/ZrO2 interface produced by co-sputtering a platinum foil and a zirconium wire target. The mechanism the paper proposes is a synergistic metal-oxide interaction in which ZrO2 keeps a fraction of surface platinum in oxidized states, and the resulting partially oxidized platinum sites speed up the Volmer step, the water-dissociation step of the alkaline HER. The diagnostic that carries the argument is the impedance spectrum: two resolved semicircles for pure Pt/FTO, assigned to the Volmer and Heyrovsky steps, collapse to one smaller semicircle for Pt@ZrO2, which is interpreted as a Volmer step too fast to resolve.

What would settle it

Measure EIS on Pt@ZrO2 electrodes with deliberately varied porosity or on a ZrO2-only film with comparable roughness; if the single semicircle persists without platinum, the fast-Volmer interpretation is not supported. Alternatively, run operando XPS at -0.275 V vs RHE in 0.1 M KOH: if the PtO/PtO2 fraction disappears under hydrogen-evolving conditions, the proposed partially oxidized active state is not the one operating.

Watch

Extended reading notes

Core claim

The central claim is that a 50 nm Pt@ZrO2 film on FTO is a high-performance bifunctional electrocatalyst for HER and HOR in alkaline media, outperforming the previously studied Pd@ZrO2 and matching Pt/FTO's charge-transfer resistance while using less platinum. X-ray photoelectron spectroscopy shows zirconium fully oxidized as ZrO2 and platinum partially oxidized, with PtO and PtO2 together making up roughly 28-33 percent of the platinum across the four film thicknesses. The proposed mechanism is that the oxyphilic ZrO2 shares oxygen with platinum, stabilising a partially oxidized state that accelerates the Volmer step of the alkaline HER, so much so that impedance spectroscopy can no longer resolve it as a separate semicircle and the composite shows one smaller arc.

Load-bearing premise

The load-bearing premise is that a single semicircle in the Pt@ZrO2 impedance spectrum means the Volmer step became too fast to resolve; a porous or rough film, or a parallel conductive path through ZrO2, could also produce one time constant, and the mechanistic conclusion rests on that assignment.

Editorial extensions

If this is right

  • Alkaline water electrolysers could use a lower platinum loading while keeping HER and HOR kinetics close to pure platinum.
  • Pt@ZrO2 is a direct improvement over Pd@ZrO2 for the same application, with roughly five to eight times lower HER charge-transfer resistance.
  • The composite survives 5000 fast voltammetric cycles in 0.1 M KOH with no change in electrochemical response, with only a slight HER current loss in 1 M KOH attributed to partial ZrO2 loss.
  • A single-semicircle impedance signature could serve as a quick screening criterion for identifying fast-Volmer composite catalysts in alkaline HER.

Reading between the lines

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

  • A testable extension is to measure the impedance at lower temperature or over a wider potential range; if a second semicircle reappears, the fast-Volmer assignment would need revision.
  • The ex situ XPS finding of PtO and PtO2 is assumed to persist at the operating potential, so operando XPS or X-ray absorption spectroscopy at -0.275 V vs RHE under hydrogen evolution would settle whether the partially oxidized state is the active one.
  • The same co-sputtering recipe could be tried with other oxyphilic ceramics such as titania or ceria to see whether the partial-oxidation effect is specific to zirconia or generic to metal-oxide supports.
  • The comparison with pure Pt is made at equal nominal thickness rather than equal mass, so a per-gram activity comparison would directly quantify the platinum-saving advantage.
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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

4 major / 5 minor

Summary. The manuscript reports the synthesis of Pt@ZrO2 composite films on FTO by ion beam sputtering deposition at four thicknesses (25, 50, 100, 200 nm) and characterizes their activity for the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) in 0.1 M and 1 M KOH using cyclic voltammetry and electrochemical impedance spectroscopy. The central claims are that the 50 nm Pt@ZrO2 electrode has lower HER charge-transfer resistance than the previously reported Pd@ZrO2 electrode, comparable HER Rct to a pure Pt/FTO film despite lower Pt loading, and improved mass activity relative to Pt/FTO; the authors attribute these improvements to a synergistic Pt–ZrO2 interaction that stabilizes Pt in a partially oxidized state and accelerates the Volmer step. Stability is assessed through 5000-cycle stress tests.

Significance. If the empirical activity comparison is accepted, the paper provides a useful data point toward reducing noble-metal loading in alkaline HER/HOR electrocatalysts. The EIS analysis is reported with fitting uncertainties and directly benchmarks Pt@ZrO2 against both Pd@ZrO2 from the authors' prior work and a Pt/FTO control, which is a strength. The reported Rct values (4.03 and 1.51 Ω for Pt@ZrO2 versus 21.87 and 11.91 Ω for Pd@ZrO2 in 0.1 M and 1 M KOH, respectively) make the comparative performance claim quantitatively grounded. However, the mechanistic conclusion that the Pt–ZrO2 interaction stabilizes partially oxidized Pt as the active HER state is not supported by the presented data and is in tension with the paper's own CV results, so the novelty claim currently rests on an unverified premise.

major comments (4)
  1. [XPS (Figure 2B, Table 2) and CV (Figure 4)] The claim that the Pt–ZrO2 interaction 'stabilizes Pt in a partially oxidized state' and that this state accelerates the Volmer step is internally inconsistent with the presented electrochemistry. The XPS evidence for PtO and PtO2 (28–33% of Pt, Table 2) was obtained on pristine, as-deposited films, whereas the EIS and CV measurements are performed at -0.275 V vs RHE. The CVs in Figure 4 show a substantial PtOx reduction feature between 0.8 and 0.5 V vs RHE, which means any surface oxide present initially is electrochemically reduced on the first cathodic sweep before reaching the HER potential. Consequently, the electrode at the operating potential should be predominantly metallic Pt, not partially oxidized Pt. The authors do not address this contradiction, and the mechanistic conclusion in the abstract and in the EIS section therefore rests on an unsupported premise. Operando or post-electrolysis XPS, or a clear statement that the oxidized state is not the operating state, is needed.
  2. [Electrochemical impedance spectroscopy (EIS), Figure 6B] The interpretation of the single semicircle for Pt@ZrO2/FTO as evidence that the Volmer step is 'too fast to be resolved by EIS' is not uniquely determined. A single time constant could equally arise from a porous or rough composite film, from a distributed constant-phase-element response, or from a parallel conductive pathway through the ZrO2 phase. Since the equivalent circuit in Figure 6D is adopted specifically because a second semicircle is absent, the assignment of the single Rct to an accelerated Volmer step is circular without a control experiment that rules out these alternative physical origins. The mechanistic claim that ZrO2 accelerates the Volmer step is therefore not established by the EIS data alone.
  3. [Cyclic voltammetry (CV), Figures 3 and 4] The CV-based activity claims, such as mass activity increases of 'more than 3 times' in 0.1 M KOH and '6 times' in 1 M KOH, are presented without replicate measurements, error bars, or statistics. No iR correction is described, and no electrochemically active surface area normalization is provided, which is particularly important when comparing a composite film against a pure Pt film. The EIS Rct values provide more quantitative support, but the CV-derived enhancement factors as stated should be treated as indicative rather than quantitative.
  4. [Stability test, Figure 5] The stability claim is stronger than the data support. In 1 M KOH, the authors report 'notable changes' and 'significant modifications' after 5000 cycles, including a decrease in HER current density from 3 to 2.7 mA/cm² at -0.05 V vs RHE. The attribution to 'partial loss of ZrO2' is speculative because no post-stress compositional analysis (e.g., XPS or SEM-EDX) is provided. The abstract's statement of 'remarkable electrochemical stability' is not supported by the observed changes in 1 M KOH; the conclusion should be qualified or the post-test characterization added.
minor comments (5)
  1. [Title and Experimental] The title refers to 'mixed platinum and zirconia powder,' but the work describes IBSD-deposited thin films on FTO. Consider adjusting the title to reflect the film morphology.
  2. [Conclusions] There are typographical errors: 'increase in Pt/ZrO2 ration' should be 'ratio,' and 'synergist effect' should be 'synergistic effect.'
  3. [EIS section] In the sentence discussing Table 3, 'the tree samples' should be 'the three samples.'
  4. [Figure 6] The Nyquist plots would benefit from explicit axis labels and units, as well as a legend identifying the electrolyte concentration for each curve.
  5. [References] Reference 15 is incomplete; it lacks a journal or source and appears truncated after '2025;'.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the performance claims rest on directly measured EIS, CV, and XPS data, with self-citations used only as contextual baselines.

full rationale

The paper's load-bearing empirical claims—higher HER/HOR mass activity, lower charge transfer resistance, and stability over 5000 CV cycles—are reported as measured quantities (Figures 3-6, Tables 3-5), not as predictions derived from fitted parameters. No parameter is fitted to a subset of data and then relabeled as a prediction of the same data; the EIS Rct values are fits to the measured spectra, and the comparison between Pt@ZrO2/FTO, Pt/FTO, and Pd@ZrO2/FTO is presented as a direct experimental comparison. The mechanistic interpretation (ZrO2 stabilizes partially oxidized Pt and accelerates the Volmer step) is an inference from ex situ XPS and the presence of a single EIS semicircle; this may be an evidence-quality concern, but it is not circular in the formal sense because the conclusion is not equivalent to the input by construction. Self-citations to the authors' prior Pd@ZrO2 paper [31] are used to motivate the thickness choice and to provide a Pd@ZrO2 baseline, but the current article's central comparison is supported by new electrochemical measurements on Pt@ZrO2 and Pt/FTO reported in this manuscript. The external citation [47] on Pt-O bonds as active sites provides independent literature context. No equation reduces to itself, and no self-citation chain is the sole support for the central claim. Therefore, no circular step meeting the required evidence standard is present.

Assumptions & free parameters 3 free parameters · 5 assumptions · 1 invented entities

The core empirical result of lower Rct for Pt@ZrO2 depends on EIS fitting parameters and on the comparison to the authors' prior Pd@ZrO2 data. The mechanistic claim adds non-operando XPS assumptions and an ad hoc interpretation of a single EIS semicircle. No new physical entities are introduced.

free parameters (3)
  • EIS equivalent circuit parameters (Rct, CPE-T, CPE-P) = See Tables 3-5; e.g., HER Rct 3.40 to 4.03 ohms in 0.1 M KOH and 1.51 to 1.65 ohms in 1 M KOH
    These are fit outputs from ZView and are the central evidence for the lower charge-transfer resistance claim; they are not independently measured constants.
  • XPS Voigt peak-fit abundances for Pt(0), PtO, and PtO2 = Pt(0) 67-72%, PtO 22-26%, PtO2 6-9% across the four thicknesses
    The partial-oxidation mechanism depends on quantitative peak fitting after Shirley background subtraction; the detailed fitting constraints are not provided.
  • Composite target exposed-area ratio = 36% Pt and 64% Zr exposed area
    Chosen to reach a target 50:50 Pt:Zr film based on sputtering-yield estimates; this design parameter underpins the reduced-precious-metal claim and is not independently verified by metal loading measurements.
assumptions (5)
  • domain assumption Equivalent-circuit models with RC parallel elements separate Volmer and Heyrovsky contributions in alkaline HER (following refs [50,51]).
    Used to assign the high-frequency arc to H-UPD/Volmer and the low-frequency arc to HER/Heyrovsky in Pt/FTO and to interpret a single arc as a fast Volmer step in Pt@ZrO2.
  • domain assumption Ex situ XPS oxidation states measured at room temperature in UHV represent the surface state under cathodic HER potentials.
    The partial-oxidation mechanism rests on PtO/PtO2 fractions measured before electrochemistry; no operando or post-test XPS is shown.
  • standard math Scofield relative sensitivity factors and Shirley background subtraction yield accurate atomic concentrations for Pt and Zr.
    The XPS composition and oxidation-state quantification depend on this standard analysis pipeline, cited as ref [40].
  • domain assumption Cyclic voltammetry current densities at 20 mV/s without iR correction and without ECSA normalization are comparable across electrodes.
    The 3x and 6x mass-activity comparisons treat geometric or calculated-mass currents as intrinsic activity; electrode roughness and uncompensated resistance are not controlled.
  • ad hoc to paper The single EIS semicircle on Pt@ZrO2 indicates a faster Volmer step rather than a porous-electrode artifact or an alternative pathway.
    This is the key interpretive step in the EIS section; the paper presents no experiment that rules out other sources of a single time constant.
invented entities (1)
  • None
    purpose: No new particles, forces, mediators, dimensions, or conserved quantities are introduced.
    The partially oxidized Pt state is a measured chemical state, not a postulated new entity.

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Cite this review

Pith. "Pith review of Mixed platinum and zirconia powder as electrocatalyst for hydrogen evolution and oxidation reaction." pith.science (2026). https://pith.science/paper/VXYE7WVU

@misc{pith2026250614819,
  author       = {Pith},
  title        = {Pith review of: Mixed platinum and zirconia powder as electrocatalyst for hydrogen evolution and oxidation reaction},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/VXYE7WVU}},
  note         = {Machine review of arXiv:2506.14819}
}
read the original abstract

The development of efficient and cost-effective bifunctional electrocatalysts for hydrogen-related technologies is crucial for the transition to sustainable energy. In this work, we present Pt@ZrO2 as a high-performance ceramic-based electrocatalyst for the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR), demonstrating superior activity and stability in alkaline conditions. Compared to Pd@ZrO2, previously investigated in our earlier work, Pt@ZrO2 exhibits significantly lower charge transfer resistance and enhanced HER/HOR kinetics, as confirmed by electrochemical impedance spectroscopy. The synergistic interaction between platinum and ZrO2 stabilizes Pt in a partially oxidized state, facilitating the Volmer step and improving charge transfer kinetics. Cyclic voltammetry further confirms the remarkable electrochemical stability of Pt@ZrO2 under stress conditions. Importantly, Pt@ZrO2 offers a cost-effective alternative to pure platinum by reducing noble metal loading while maintaining excellent catalytic performance. These findings establish Pt@ZrO2 as a better alternative to Pd@ZrO2 and a promising candidate for next-generation hydrogen energy applications.

Figures

Figures reproduced from arXiv: 2506.14819 by the authors.

Figure 1
Figure 1. Pt and Zr composite sputtering target composed of a Platinum foil, an aluminium frame and a Zirconium wire [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Normalized XPS spectra of pristine samples at (A) Zr 3d and (B) Pt 4f energy regions for the four different [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Comparison between CVs recorded with 50 nm Pt/FTO (black curve) and 50 nm Pt@ZrO [PITH_FULL_IMAGE:figures/full_fig_p009_3.png] view at source ↗
Figures from the paper (3 more)
Figure 4
Figure 4. Figure 4: Comparison of the CVs recorded with 50 nm Pd@ZrO [PITH_FULL_IMAGE:figures/full_fig_p009_4.png]
Figure 5
Figure 5. Figure 5: stability test - comparison between CVs recorded on 50 nm Pt@ZrO2/FTO before the 5000 cycles CVs stress [PITH_FULL_IMAGE:figures/full_fig_p010_5.png]
Figure 6
Figure 6. Figure 6: Nyquist Plot of: (A) IBSD 50 nm Pt/FTO and (B) 50 nm Pt@ZrO [PITH_FULL_IMAGE:figures/full_fig_p011_6.png]

Discussion (0). Continue with ORCID to comment.

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Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.