气候变化领域集成服务门户(CCPortal): Efficient hydrogen peroxide synthesis by metal-free polyterthiophene: Via photoelectrocatalytic dioxygen reduction

CCPortal

DOI	10.1039/c9ee02247c
	Efficient hydrogen peroxide synthesis by metal-free polyterthiophene: Via photoelectrocatalytic dioxygen reduction
	Fan W.; Zhang B.; Wang X.; Ma W.; Li D.; Wang Z.; Dupuis M.; Shi J.; Liao S.; Li C.
发表日期	2020
ISSN	17545692
起始页码	238
结束页码	245
卷号	13 期号:1
英文摘要	Solar hydrogen peroxide (H2O2) produced through the selective two-electron (2e-) oxygen reduction pathway is an ideal alternative to liquid fuel in addition to being a versatile chemical. Up to now, low photocatalytic activity, low selectivity and serious competing reactions have been big hurdles in the production of solar H2O2 in an efficient way. Herein, we report that polyterthiophene (pTTh), a metal-free narrow-bandgap polymeric semiconductor, is an efficient photocathode for H2O2 production in alkaline solution. We found that 2e- selectivity for the ORR is dependent on the pH of electrolytes and approaches 100% at pH ∼ 13. A record-high H2O2 concentration of 110 mmol L-1 is achieved, which is two orders of magnitude higher than the previous photosynthesized H2O2. Furthermore, NiFeOx/BiVO4-pTTh dual-photoelectrodes in photoelectrochemical devices enabled bias-free synthesis of solar H2O2 of concentration ∼90 mmol L-1 for several cycles without any noticeable decay. This extremely high 2e- selectivity is attributed to the intrinsic electrochemical properties of pTTh. Theoretical calculations suggested that the selectivity-determining step in the 2e- process is over ∼200 times faster than that in the 4e- pathway. Our work paves an alternative way of generating liquid solar fuel that is very promising for practical applications. © 2020 The Royal Society of Chemistry.
英文关键词	Alkalinity; Electrolytic reduction; Hydrogen fuels; Hydrogen peroxide; Narrow band gap semiconductors; Oxidation; Peroxides; Photocatalytic activity; Alkaline solutions; Dioxygen reduction; Orders of magnitude; Photo-electrochemical device; Photoelectrocatalytic; Polymeric semiconductors; Polyterthiophenes; Theoretical calculations; Solar power generation; catalysis; chemical alteration; electrochemical method; electrode; hydrogen peroxide; oxygen; photodegradation; reduction
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/189758
作者单位	State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 4116023, China; Key Laboratory of Fuel Cell Technology of Guangdong Province, Key Laboratory of New Energy Technology of Guangdong University, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong, 510641, China; Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, United States
推荐引用方式 GB/T 7714	Fan W.,Zhang B.,Wang X.,et al. Efficient hydrogen peroxide synthesis by metal-free polyterthiophene: Via photoelectrocatalytic dioxygen reduction[J],2020,13(1).
APA	Fan W..,Zhang B..,Wang X..,Ma W..,Li D..,...&Li C..(2020).Efficient hydrogen peroxide synthesis by metal-free polyterthiophene: Via photoelectrocatalytic dioxygen reduction.Energy & Environmental Science,13(1).
MLA	Fan W.,et al."Efficient hydrogen peroxide synthesis by metal-free polyterthiophene: Via photoelectrocatalytic dioxygen reduction".Energy & Environmental Science 13.1(2020).