Hydrogen Peroxide Production from Solar Water Oxidation

ACS Energy Letters, Journal Year: 2019, Volume and Issue: 4(12), P. 3018 - 3027

Published: Nov. 13, 2019

Propelled by photovoltaic cell and electrolysis research, the photoelectrochemical (PEC) water splitting system has been tuned to produce a high-value-added product be competitive strategy for solar-to-fuel conversion. The hydrogen peroxide (H2O2) produced two-electron pathway from oxidation recently focus of redesigned PEC technologies, which will significant important unassisted systems that use only light, water, oxygen simultaneously electricity H2O2 redox coupling H2O. Moreover, it is expected increase efficiency solar through intermediate as easily disproportionates O2 Here, we present our prospects an exciting new direction production mechanism guiding material design, provide considerable possibility revitalization splitting.

Language: Английский

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Catalyst Design for Electrochemical Oxygen Reduction toward Hydrogen Peroxide

Advanced Functional Materials, Journal Year: 2020, Volume and Issue: 30(35)

Published: June 18, 2020

Abstract Precise electrochemical synthesis under ambient conditions has provided emerging opportunities for renewable energy utilization. Among many promising systems, the production of hydrogen peroxide (H 2 O ) from cathodic oxygen reduction reaction (ORR) attracted considerable interest in past decades due to increasing market demands and vital role ORR electrocatalysis field. This work describes recent advances materials H 2e - ORR. By using Pt as a stereotype, tuning knobs are overviewed, including intrinsic binding strength oxygenated species, intermediate diffusion path isolation Pt–Pt ensembles that enable pathway 4e total reduction. knowledge is successfully applied other transition metal systems leads discovery more efficient alloy catalysts with balanced improvement on both activity selectivity. In addition, mesostructure engineering heteroatoms doping strategies carbon‐based materials, which significantly boost efficiency compared intact carbon sites, also reviewed. Finally, future directions challenges transferring developed lab scale tests pilot plant operations briefly outlooked.

Language: Английский

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Near-Complete Suppression of Oxygen Evolution for Photoelectrochemical H₂O Oxidative H₂O₂ Synthesis

Journal of the American Chemical Society, Journal Year: 2020, Volume and Issue: 142(19), P. 8641 - 8648

Published: March 12, 2020

Solar energy-assisted water oxidative hydrogen peroxide (H2O2) production on an anode combined with H2 a cathode increases the value of solar splitting, but challenge dominant product, O2, needs to be overcome. Here, we report SnO2-x overlayer coated BiVO4 photoanode, which demonstrates great ability near-completely suppress O2 evolution for photoelectrochemical (PEC) H2O H2O2 evolution. Based surface hole accumulation measured by photovoltage, downward quasi-hole Fermi energy at photoanode/electrolyte interface and thermodynamic Gibbs free between 2-electron 4-electron competitive reactions, are able consider photoinduced holes that migrate kinetically favor selectivity reduced band bending. The formation may mediated hydroxyl radicals (OH·), from 1-electron oxidation as evidenced spin-trapping electron paramagnetic resonance (EPR) studies conducted herein. In addition PEC SnO2-x/BiVO4 photoanode can also inhibit decomposition into under either electrocatalysis or photocatalysis conditions continuous accumulation. Overall, achieves Faraday efficiency (FE) over 86% generation in wide potential region (0.6-2.1 V vs reversible electrode (RHE)) rate averaging 0.825 μmol/min/cm2 1.23 RHE AM 1.5 illumination, corresponding ∼5.6%; this performance surpasses almost all previous performances. Because simultaneous splitting cells, our results highlight potentially greener more cost-effective approach "solar-to-fuel" conversion.

Language: Английский

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Electrochemical oxygen reduction to hydrogen peroxide at practical rates in strong acidic media

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: May 24, 2022

Electrochemical oxygen reduction to hydrogen peroxide (H2O2) in acidic media, especially proton exchange membrane (PEM) electrode assembly reactors, suffers from low selectivity and the lack of low-cost catalysts. Here we present a cation-regulated interfacial engineering approach promote H2O2 (over 80%) under industrial-relevant generation rates 400 mA cm-2) strong media using just carbon black catalyst small number alkali metal cations, representing 25-fold improvement compared that without cation additives. Our density functional theory simulation suggests "shielding effect" cations which squeeze away catalyst/electrolyte protons thus prevent further generated water. A double-PEM solid electrolyte reactor was developed realize continuous, selective (∼90%) stable 500 hours) via implementing this effect for practical applications.

Language: Английский

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Approaching a high-rate and sustainable production of hydrogen peroxide: oxygen reduction on Co–N–C single-atom electrocatalysts in simulated seawater

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 14(10), P. 5444 - 5456

Published: Jan. 1, 2021

Sustainable production of H 2 O is boosted by oxygen reduction reaction on Co–N 5 sites in a flow cell simulated seawater.

Language: Английский

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