气候变化领域集成服务门户(CCPortal): Electrochemical surface charge-inversion from semi-insulating Sb2Se3 photoanodes and abrupt photocurrent generation for water splitting

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DOI	10.1039/c8ee00923f
	Electrochemical surface charge-inversion from semi-insulating Sb2Se3 photoanodes and abrupt photocurrent generation for water splitting
	Kim Y.B.; Kim J.S.; Baek S.K.; Yun Y.D.; Cho S.W.; Jung S.H.; Cho H.K.
发表日期	2018
ISSN	17545692
起始页码	2540
结束页码	2549
卷号	11 期号:9
英文摘要	Binary chalcogenide Sb2Se3 shows dominantly p-type electrical conductivity and poor photocathodic performance; however, its narrow band gap and low work function suggest satisfactory conditions for the generation of the inversion state at the surface if used as a photoanode. We propose a fabrication design for the synthesis of n-type Sb2Se3 by suppressing the formation of antisite SbSe defects, where excessively thick Se layers deposited on the electrodeposited Sb-Se precursors and high N2 pressure are introduced during the annealing step. Surprisingly, the linear sweep voltage (LSV) measurement from the n-type Sb2Se3 shows remarkably enhanced photocurrent density (up to approximately 5 mA cm-2 at 1.23 V vs. a reversible hydrogen electrode) under light illumination, which is the highest performance among pristine binary photoelectrodes yet recorded. In addition, the LSV curve exhibits non-typical behavior with a significant increase of the photocurrent at the specific potential. The measured current density under light illumination and no dark current indicate a vigorous photoactive reaction from photogenerated carriers. Here, the abrupt increase in photocurrent density is attributed to the conduction path of hole carriers originating from the charge inversion state with p-type conductivity at the surface, allowing significant carrier injection into the electrolyte. Based on electrochemical analyses, the mechanism that results in outstanding photocurrent gain from the novel n-type Sb2Se3 photoanodes was proposed and their further development possibilities via additional improvements were presented. © 2018 The Royal Society of Chemistry.
英文关键词	Electrodes; Electrolytes; Energy gap; Photocurrents; Semiconducting films; Electrical conductivity; Electrochemical analysis; Electrochemical surfaces; P type conductivity; Photocurrent density; Photocurrent generations; Photogenerated carriers; Reversible hydrogen electrodes; Antimony compounds; annealing; electric field; electrical conductivity; electrochemistry; experimental design; hydrogen; insulation; lead; selenium; Lily symptomless virus
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/190122
作者单位	School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu Suwon Gyeonggi-do, 16419, South Korea
推荐引用方式 GB/T 7714	Kim Y.B.,Kim J.S.,Baek S.K.,et al. Electrochemical surface charge-inversion from semi-insulating Sb2Se3 photoanodes and abrupt photocurrent generation for water splitting[J],2018,11(9).
APA	Kim Y.B..,Kim J.S..,Baek S.K..,Yun Y.D..,Cho S.W..,...&Cho H.K..(2018).Electrochemical surface charge-inversion from semi-insulating Sb2Se3 photoanodes and abrupt photocurrent generation for water splitting.Energy & Environmental Science,11(9).
MLA	Kim Y.B.,et al."Electrochemical surface charge-inversion from semi-insulating Sb2Se3 photoanodes and abrupt photocurrent generation for water splitting".Energy & Environmental Science 11.9(2018).