Enhanced photocatalytic N-2 fixation by promoting N-2 adsorption with a co-catalyst

doi:10.1016/j.scib.2019.05.009

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	Enhanced photocatalytic N-2 fixation by promoting N-2 adsorption with a co-catalyst
	X.Gao; L.An; D.Qu; W.S.Jiang; Y.X.Chai; S.R.Sun; X.Y.Liu
	2019
发表期刊	Science Bulletin
ISSN	2095-9273
卷号	64 期号:13 页码:918-925
摘要	Photocatalytic N-2 fixation involves a nitrogen reduction reaction on the surface of the photocatalyst to convert N-2 into ammonia. Currently, the adsorption of N-2 is the limiting step for the N-2 reduction reaction on the surface of the catalyst. Based on the concept of photocatalytic water splitting, the photocatalytic efficiency can be greatly enhanced by introducing a co-catalyst. In this report, we proposed a new strategy, namely, the loading of a NiS co-catalyst on CdS nanorods for photocatalytic N-2 fixation. Theoretical calculation results indicated that N-2 was effectively adsorbed onto the NiS/CdS surface. Temperature programmed desorption studies confirmed that the N-2 molecules preferred to adsorb onto the NiS/CdS surface. Linear sweep voltammetry results revealed that the overpotential of the N-2 reduction reaction was reduced by loading NiS. Furthermore, transient photocurrent and electrochemical impedance spectroscopy indicated that the charge separation was enhanced by introducing NiS. Photocatalytic N-2 fixation was carried out in the presence of the catalyst dispersed in water without any sacrificial agent. As a result, 1.0 wt% NiS/CdS achieved an ammonia production rate of 2.8 and 1.7 mg L (1) for the first hour under full spectrum and visible light (lambda > 420 nm), respectively. The catalyst demonstrated apparent quantum efficiencies of 0.76%, 0.39% and 0.09% at 420, 475 and 520 nm, respectively. This study provides a new method to promote the photocatalytic efficiency of N(2 )fixation. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
关键词	NiS,driven nitrogen-fixation,ammonia-synthesis,visible-light,oxygen,vacancies,water
DOI	10.1016/j.scib.2019.05.009
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收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/63373
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	X.Gao,L.An,D.Qu,et al. Enhanced photocatalytic N-2 fixation by promoting N-2 adsorption with a co-catalyst[J]. Science Bulletin,2019,64(13):918-925.
APA	X.Gao.,L.An.,D.Qu.,W.S.Jiang.,Y.X.Chai.,...&X.Y.Liu.(2019).Enhanced photocatalytic N-2 fixation by promoting N-2 adsorption with a co-catalyst.Science Bulletin,64(13),918-925.
MLA	X.Gao,et al."Enhanced photocatalytic N-2 fixation by promoting N-2 adsorption with a co-catalyst".Science Bulletin 64.13(2019):918-925.

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