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arxiv: 2606.25282 · v1 · pith:4KI6LLRPnew · submitted 2026-06-24 · ⚛️ physics.chem-ph

Sustainable photocatalytic CO2 conversion using microalgae as a carbon-negative scavenger

Ho Truong Nam Hai , Augusto Ducati Luchessi , Makoto Arita , Qixin Guo , Kaveh Edalati This is my paper

Pith reviewed 2026-06-25 20:41 UTC · model grok-4.3

classification ⚛️ physics.chem-ph
keywords photocatalytic CO2 conversionmicroalgaehigh-entropy oxidesacrificial agentCO productionCH4 productioncarbon-negative process
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The pith

Microalgae boost photocatalytic CO2-to-CO and CH4 production by 10- and 4-fold over high-entropy oxide alone.

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

The paper investigates the use of microalgae to enhance the efficiency of solar-driven photocatalytic conversion of CO2 into CO and CH4. By comparing systems with microalgae, microplastics, and no sacrificial agent, it finds that microalgae provide the largest increase in product yields. This is achieved with a specially designed high-entropy oxide catalyst that aids CO2 adsorption and charge handling. The combination suggests a way to make CO2 reduction both more efficient and more sustainable by leveraging biological CO2 scavenging.

Core claim

The central discovery is that the utilization of microalgae during photocatalytic reactions leads to a remarkable enhancement in CO2 conversion compared to catalysis with or without using microplastics, with CO and CH4 production increasing by 10- and 4-fold, respectively, compared to the system using only the high-entropy oxide.

What carries the argument

Microalgae serving as a sustainable sacrificial agent in photocatalytic CO2 reduction using a bi-polymorphic AB2O6-type high-entropy oxide.

If this is right

  • The microalgae system achieves higher CO2 conversion than microplastics or catalyst alone.
  • The HEO incorporates specific metals to improve surface basicity, polarization, and charge transport for better performance.
  • This offers a carbon-negative approach by combining microalgae photosynthesis with photocatalysis.
  • The polymorphic structure of the HEO enables new applications in photocatalysis.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The approach might be extended to other photosynthetic organisms or mixed cultures for optimized performance.
  • Industrial implementation could involve coupling with existing microalgae farms to simultaneously treat CO2 emissions and produce fuels.
  • The enhancement may depend on the specific interaction between microalgae byproducts and the catalyst surface, suggesting targeted experiments on metabolite effects.

Load-bearing premise

The measured increases in CO and CH4 production are due to the microalgae acting as an effective sacrificial agent without introducing artifacts or side reactions.

What would settle it

A control experiment showing identical product yields when microalgae are omitted or replaced with an inert substance would indicate that the enhancement is not caused by the microalgae.

Figures

Figures reproduced from arXiv: 2606.25282 by Augusto Ducati Luchessi, Ho Truong Nam Hai, Kaveh Edalati, Makoto Arita, Qixin Guo.

Figure 1
Figure 1. Figure 1: Schematics of the CO2 conversion experiment using microalgae as sacrificial agent. Materials and methods Reagents Five metal oxides, including cesium tantalum oxide (CsTaO3, 99.9 %), barium peroxide (BaO2, 99 %), bismuth trioxide (Bi2O3, 99.9 %), niobium pentoxide (Nb2O5, 99 %), and tantalum pentoxide (Ta2O5, 99.9 %), were obtained from Mitsuwa Pure Chemical, Kojundo, and Fujifilm, Japan. Sodium bicarbonat… view at source ↗
Figure 2
Figure 2. Figure 2: a describes the crystal structure of the material at different stages of synthesis. The XRD profile shows the transformation of the crystal structure from the initial mixture of oxides to new phases. It can be observed that after the first processing stage, where the sample was treated by HPT twice and subsequently calcinated, the resulting material (HPT + HPT + C) exhibits new diffraction peaks that diffe… view at source ↗
Figure 3
Figure 3. Figure 3: Homogeneous arrangements of elements in HEO. (a) SEM micrograph with EDS mappings and (b) HAADF micrograph by STEM with corresponding EDS mappings for HEO [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Chemical state of metals and oxygen in HEO. XPS spectra for (a) cesium, (b) barium, (c) bismuth, (d) niobium, (e) tantalum, and (f) oxygen in HEO. Nanostructure and atomic structure [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Formation of nanograins and dislocation cells in HEO. (a) BF, (b) DF, (c) SAED, and (d-f) HR analyses of HEO taken by TEM [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: The transformation in local electronic structure and neighbourhood of cations in HEO compared with relevant binary and ternary oxides. (a, c, e, g) XANES spectra and (b, d, f, h) Fourier-transformed EXAFS spectra in R-space for (a, b) Cs L3-edge, (c, d) Ba L3-edge, (e, f) Bi L3-edge, (g, h) Ta L3-edge of HEO and relevant binary and ternary oxides. Optical and spin characterizations Fig. 7a depicts the UV-V… view at source ↗
Figure 7
Figure 7. Figure 7: Optical characterization and appropriate band structure of HEO for CO2 conversion. (a) UV-Vis light absorbance analysis, (b) direct bandgap estimation based on Kulbelka-Munk method, (c) UPS analysis (He I, bias −4 V, VBM: valence band maximum, SECO: secondary electron cut-off), (d) band structure with valence band and conduction band values versus normal hydrogen electron and versus vacuum, and (e) ESR spe… view at source ↗
Figure 8
Figure 8. Figure 8: Enhanced CO2 conversion process efficiency using HEO as photocatalyst and microalgae as sacrificial agent. (a) H2, (b) CO, and (c) CH4 production from photocatalysis reactions under various conditions. (d) Average product concentration from photocatalysis and microalgae degradation. (e) Photocatalytic production rates for three cycles by using HEO and microalgae. (f) FT-IR spectra of microalgae before and … view at source ↗
read the original abstract

Photocatalytic CO2 conversion driven by solar energy is a highly promising approach in addressing rising atmospheric CO2 levels; however, its practical application remains limited by low conversion efficiency. In this study, a new strategy to enhance CO2 reduction toward CO and CH4 is proposed through the employment of microalgae as a sacrificial agent, and the efficiency is compared with conventional CO2 conversion without and with the use of microplastics as sacrificial agents. To realize this strategy, an AB2O6-type high-entropy oxide (HEO), (Cs1/7Ba4/7Bi2/7)(Nb1/2Ta1/2)2O6, with bi-polymorphy of layered perovskite and pyrochlore, is rationally designed. The HEO incorporates alkali metal cesium and alkaline earth metal barium to increase surface basicity for CO2 chemisorption, bismuth with its stereochemically active lone pairs for localized polarization and charge separation, and tantalum and niobium to form octahedral crystalline frameworks for charge transport. The utilization of microalgae during photocatalytic reactions leads to a remarkable enhancement in CO2 conversion compared to catalysis with or without using microplastics, with CO and CH4 production increasing by 10- and 4-fold, respectively, compared to the system using only HEO. These findings not only demonstrate a new family of polymorphic AB2-type HEOs for photocatalysis but also show the potential of microalgae as a sustainable sacrificial agent, offering an environmentally friendly pathway for efficient CO2 capture (through photosynthesis by microalgae) and CO2 conversion (through photocatalysis by HEOs).

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 0 minor

Summary. The manuscript proposes a strategy for photocatalytic CO2 reduction using a rationally designed bi-polymorphic AB2O6-type high-entropy oxide (HEO), (Cs1/7Ba4/7Bi2/7)(Nb1/2Ta1/2)2O6, in combination with microalgae as a sacrificial agent. It claims that this yields 10-fold and 4-fold increases in CO and CH4 production, respectively, relative to the HEO catalyst alone, while also comparing performance against systems using microplastics; the work positions microalgae as a sustainable, carbon-negative scavenger via combined photosynthesis and photocatalysis.

Significance. If the reported yield enhancements are substantiated, the approach could advance integrated biological-photocatalytic systems for CO2 conversion and introduce a new family of polymorphic HEO materials with tailored basicity, polarization, and charge transport properties. The component selection rationale (Cs/Ba for basicity, Bi for lone-pair effects, Nb/Ta for octahedral frameworks) aligns with established design principles in oxide photocatalysis.

major comments (1)
  1. [Abstract] Abstract: The central claim of 10-fold and 4-fold enhancements in CO and CH4 production is stated quantitatively but without any reference to raw data, error bars, replicate counts, or explicit controls for confounding variables (e.g., catalyst stability, side reactions, or measurement artifacts from the microalgae addition). This absence prevents verification that the observed increases arise specifically from microalgae functioning as an effective sacrificial agent.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the detailed review and constructive feedback on our manuscript. We address the major comment point-by-point below.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The central claim of 10-fold and 4-fold enhancements in CO and CH4 production is stated quantitatively but without any reference to raw data, error bars, replicate counts, or explicit controls for confounding variables (e.g., catalyst stability, side reactions, or measurement artifacts from the microalgae addition). This absence prevents verification that the observed increases arise specifically from microalgae functioning as an effective sacrificial agent.

    Authors: We acknowledge that the abstract presents the enhancement factors without accompanying statistical details. This is standard for abstracts due to length constraints, but the full manuscript reports the underlying data: production rates with error bars from triplicate experiments, replicate counts, and controls for catalyst stability and side reactions (including blank tests without microalgae and with microplastics) are provided in the Results section, Figure 3, and the Supplementary Information. To address the concern directly, we will revise the abstract to include a short clause noting that the reported enhancements are based on triplicate measurements with statistical analysis detailed in the main text. revision: partial

Circularity Check

0 steps flagged

No circularity; purely experimental comparisons with no derivations or self-referential steps

full rationale

The paper reports direct experimental yield measurements (10-fold CO, 4-fold CH4 increase with microalgae vs. HEO alone) under controlled conditions with/without microplastics. No equations, models, fitted parameters, predictions, or self-citations appear in the abstract or described content. The central claim rests on observable product ratios from independent runs, satisfying the default expectation of no circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 1 invented entities

The central claim depends on the performance of a newly composed high-entropy oxide and the assumption that microalgae serve as an effective sacrificial agent; the material design choices are introduced specifically for this study.

axioms (1)
  • domain assumption Sacrificial agents improve photocatalytic CO2 reduction efficiency by supplying electrons or suppressing charge recombination
    The paper invokes this standard photocatalysis concept to account for the role of microalgae.
invented entities (1)
  • Bi-polymorphic AB2O6-type high-entropy oxide (Cs1/7Ba4/7Bi2/7)(Nb1/2Ta1/2)2O6 no independent evidence
    purpose: To increase surface basicity for CO2 chemisorption, enable localized polarization via bismuth, and support charge transport via Nb/Ta octahedra
    The exact composition and bi-polymorphy are rationally designed for the study with no independent prior evidence cited in the abstract.

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