气候变化领域集成服务门户(CCPortal): Light-assisted electrochemical water-splitting at very low bias voltage using metal-free polythiophene as photocathode at high pH in a full-cell setup

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DOI	10.1039/c7ee03669h
	Light-assisted electrochemical water-splitting at very low bias voltage using metal-free polythiophene as photocathode at high pH in a full-cell setup
	Oka K.; Tsujimura O.; Suga T.; Nishide H.; Winther-Jensen B.
发表日期	2018
ISSN	17545692
起始页码	1335
结束页码	1342
卷号	11 期号:5
英文摘要	We report the use of polyterthiophenes (PTTh) as a rare, combined light-harvester and catalyst for the hydrogen evolution reaction at high pH. Illuminated PTTh in combination with a MnOx anode in a two-electrode setup exhibited stable water-splitting at a bias-potential of only 0.3 V at pH 12. This confirms that PTTh used as photocathode can produce photovoltages of at least 900 mV for the hydrogen evolution reaction at high pH and is therefore a suitable match for traditional water-oxidation catalysts such as MnOx, CoOx, and RuOx. Films of PTTh were fabricated using a novel, metal-free method where iodine vapor is used as oxidant; thus, previously observed interference from metal residuals was omitted and thereby a gravimetric photo electrocatalytic conversion rate of 330 mmol(H2) h-1 g-1 was achieved in phosphate buffer (pH 7) at 0 V vs. RHE. A striking property of this new strand of polythiophene was an "inverse" correlation (compared to that predicted using the Nernstian relationship) between the onset potential for the light-assisted water reduction reaction and pH: the potential (vs. RHE) required for a given current was more positive at higher pH, which is not observed for other (photo-) electrocatalytic materials, and indicates that the charge neutralization of PTTh (rather than the pH) guides the onset potential. © 2018 The Royal Society of Chemistry.
英文关键词	Catalysts; Hydrogen production; Manganese compounds; Photocathodes; Thorium compounds; Charge neutralization; Conversion rates; Electrocatalytic materials; Hydrogen evolution reactions; Low bias voltage; Phosphate buffers; Polyterthiophenes; Water oxidation catalysts; Phosphorus compounds; catalyst; electrochemical method; electrode; hydrolysis; light effect; metal; neutralization; pH
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/190248
作者单位	Department of Applied Chemistry, Waseda University, Tokyo, 169-8555, Japan; Department of Advanced Science and Engineering, Waseda University, Tokyo, 169-8555, Japan
推荐引用方式 GB/T 7714	Oka K.,Tsujimura O.,Suga T.,et al. Light-assisted electrochemical water-splitting at very low bias voltage using metal-free polythiophene as photocathode at high pH in a full-cell setup[J],2018,11(5).
APA	Oka K.,Tsujimura O.,Suga T.,Nishide H.,&Winther-Jensen B..(2018).Light-assisted electrochemical water-splitting at very low bias voltage using metal-free polythiophene as photocathode at high pH in a full-cell setup.Energy & Environmental Science,11(5).
MLA	Oka K.,et al."Light-assisted electrochemical water-splitting at very low bias voltage using metal-free polythiophene as photocathode at high pH in a full-cell setup".Energy & Environmental Science 11.5(2018).