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题名: High efficient solar hydrogen generation by modulation of Co-Ni sulfide (220) surface structure and adjusting adsorption hydrogen energy
作者: Gao, HB; Zhen, WL; Ma, JT; Lu, GX
收录类别: SCIE
出版日期: 2017-06-05
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
卷号: 206, 页码:353-363
出版者: ELSEVIER
出版地: AMSTERDAM
英文摘要: Low overpotential co-catalyst is a key component for a photocatalyst in photocatalytic hydrogen generation. Dual transition metal sulfide is known as a candidate in replacing noble metal. Its property is highly dependent on its surface structure and chemical state. In this paper, we found that the hydrogen adsorption energy (AGH) on various dual metal sulfide CoxNi(4-x)S(4) co-catalysts could be adjusted by variation of Co and Ni ratio. The hydrogen adsorption energies over Co and Ni sites in Co2Ni2S4 catalyst were 548.7 and 506 kJ mol(-1) respectively, while the corresponding energies over CoNi3S4 and Co3NiS4 catalysts were much higher than the data over Co2Ni2S4 catalyst. It was found that the XRD peaks of (220) facet of CoxNi(4-x)S(4) shifted from 26.27 to 26.53 when Co/Ni ration varied from 3 to 1, while other facet XRD peak location did not changed, indicating surface structure of (220) facet was adjusted and could be artificially controlled. In optimized Co2Ni2S4 co-catalyst surface, the intermediate during hydrogen formation is much more stable than over other CoxNi(4-x)S(4) co-catalyst. The surface chemical state were also controlled by Co and Ni ratio, the corresponding Co 2p(3/2) of CoxNi(4-x)S(4)@MIL-101 samples shifted to higher energy side when the Co/Ni ratio changed from 3:1 to 1:3, while Ni 2p(3/2) shifted to low energy side, which implied the composition and surface structure change leading to subtle Variation of surface chemical state, as a result, it affected the properties of co-catalyst. The electrochemical and fluorescence measurement results indicated that the Co2Ni2S4@MIL-101 exhibited the highest transient photocurrent, the lowest overpotential (-0.33 V) and the longer fluorescence lifetime (1.49 ns). The obtained Co2Ni2S4@MIL-101 catalyst exhibited excellent activity for hydrogen generation (882.7 mu mol H-2 in 2 h), better stability and higher apparent quantum efficiency (AQE) of 48.9% under visible light irradiation (>430 rim). The high photocatalytic efficiency of Co2Ni2S4@MIL-101 catalyst can be attributed to the low AGH over Co2Ni2S4 co-catalyst, stable reaction intermediate during hydrogen formation and better photoelectrochemical properties. (C) 2017 Elsevier B.V. All rights reserved.
关键词: CoNi sulfide cocatalyst ; Low hydrogen adsorption energy ; The (220) facet adjusting ; Low overpotential ; High efficiency for visible photocatalytic hydrogen generation
作者部门: [Gao, Haibo ; Zhen, Wenlong ; Ma, Jiantai] Lanzhou Univ, Coll Chem & Chem Engn, State Key Lab Appl Organ Chem, Lanzhou, Peoples R China ; [Gao, Haibo ; Zhen, Wenlong ; Lu, Gongxuan] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou, Peoples R China
通讯作者: Lu, GX (reprint author), Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou, Peoples R China.
学科分类: Chemistry; Engineering
文章类型: Article
所属项目编号: NSFC [21433007, 21673262] ; 973 Program of China [2013CB632404]
所属项目名称: 国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划)
项目资助者: NSFC ; MOST
语种: 英语
DOI: 10.1016/j.apcatb.2017.01.048
ISSN号: 0926-3373
WOS记录号: WOS:000395602000037
IR记录号: WOS:000395602000037
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/188862
Appears in Collections:化学化工学院_期刊论文

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Recommended Citation:
Gao, HB,Zhen, WL,Ma, JT,et al. High efficient solar hydrogen generation by modulation of Co-Ni sulfide (220) surface structure and adjusting adsorption hydrogen energy[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2017,206:353-363.
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