气候变化领域集成服务门户(CCPortal): Highly durable photoelectrochemical H2O2production: Via dual photoanode and cathode processes under solar simulating and external bias-free conditions

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DOI	10.1039/c9ee03154e
	Highly durable photoelectrochemical H2O2production: Via dual photoanode and cathode processes under solar simulating and external bias-free conditions
	Jeon T.H.; Kim H.; Kim H.-I.; Kim H.-I.; Choi W.; Choi W.
发表日期	2020
ISSN	17545692
起始页码	1730
结束页码	1742
卷号	13 期号:6
英文摘要	This study demonstrated efficient solar-to-H2O2 conversion through a photoelectrochemical (PEC) cell that maximizes the utilization of solar energy by having double side generation of H2O2 on both the photoanode and cathode. This work was accomplished by preparing (i) efficient BiVO4 (BVO) photoanodes modified with various metal dopants (Mo, W, or Cr), (ii) surface-treatment with phosphate on the as-synthesized photoanodes, and (iii) single-walled carbon nanotube (CNT) electrodes with anchored anthraquinone (AQ-CNT), a reversible H2O2-evolving catalyst that has been widely used in the H2O2 production industry. The introduction of Mo into BVO and surface phosphate treatment on BVO (P-Mo-BVO) enhanced the faradaic efficiency (FE) of H2O2 production from water oxidation and slowed the H2O2 decomposition kinetics with achieving highly durable PEC reactions over 100 h (90% photocurrent remained), while bare Mo-BVO experienced the rapid decline of the photocurrent during irradiation with the dissolution of BiVO4. The utilization of AQ on the cathode made the H2O2 production by oxygen reduction highly selective and suppressed competing H2 production completely. Consequently, the optimized configuration of a BVO photoanode modified with Mo (10 atom%) and phosphate and an AQ-CNT cathode enabled H2O2 production on both electrodes, yielding H2O2 production with FE values of 40-50% and ∼100%, respectively, across a broad range of potentials (0.75 to 2 VRHE) and a net H2O2 production rate of 0.66 μmol min-1 cm-2 at 1.0 VRHE. This dual electrode system also successfully demonstrated H2O2 production under an external bias-free condition with a net H2O2 production rate of 0.16 μmol min-1 cm-2 and FE value of ∼43% and ∼100% for photoanodic and cathodic production, respectively. To the best of our knowledge, this is the most durable PEC system for H2O2 production obtained using a BiVO4-based photoanode that enabled the simultaneous photoanodic and cathodic production of H2O2. © The Royal Society of Chemistry.
英文关键词	Cathodes; Electrolytic reduction; Hydrogen production; Ketones; Photoelectrochemical cells; Single-walled carbon nanotubes (SWCN); Solar energy; Surface treatment; Decomposition kinetics; Faradaic efficiencies; Optimized configuration; Oxygen Reduction; Phosphate treatment; Photoelectrochemicals; Production industries; Production rates; Bismuth compounds
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189638
作者单位	Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea; Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, South Korea; Future City Open Innovation Center, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea; Institute for Convergence Research and Education in Advanced Technology, Yonsei University, Seoul, 03722, South Korea
推荐引用方式 GB/T 7714	Jeon T.H.,Kim H.,Kim H.-I.,et al. Highly durable photoelectrochemical H2O2production: Via dual photoanode and cathode processes under solar simulating and external bias-free conditions[J],2020,13(6).
APA	Jeon T.H.,Kim H.,Kim H.-I.,Kim H.-I.,Choi W.,&Choi W..(2020).Highly durable photoelectrochemical H2O2production: Via dual photoanode and cathode processes under solar simulating and external bias-free conditions.Energy & Environmental Science,13(6).
MLA	Jeon T.H.,et al."Highly durable photoelectrochemical H2O2production: Via dual photoanode and cathode processes under solar simulating and external bias-free conditions".Energy & Environmental Science 13.6(2020).