Bifunctional citrate-Ni0.9Co0.1(OH): Xlayer coated fluorine-doped hematite for simultaneous hole extraction and injection towards efficient photoelectrochemical water oxidation

doi:10.1039/d1nr03257g

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	Bifunctional citrate-Ni0.9Co0.1(OH): Xlayer coated fluorine-doped hematite for simultaneous hole extraction and injection towards efficient photoelectrochemical water oxidation
	Wang, Peng 1; Li, Feng 2; Long, Xuefeng 3; Wang, Tong 1; Chai, Huan 1; Yang, Honglei 1; Li, Shuwen 1; Ma, Jiantai 1; Jin, Jun 1
刊名	Nanoscale
	2021-09-07
卷号	13 期号:33 页码:14197-14206
关键词	Cobalt Electrolytes Fluorine Hematite Internal oxidation Nickel Photocurrents Photoelectrochemical cells Surface reactions Catalytic active sites Hematite photoanode Photocurrent density Photoelectrochemical water oxidation Photoelectrochemicals Reversible hydrogen electrodes Surface trap-states Synergistic effect
ISSN号	20403364
DOI	10.1039/d1nr03257g
英文摘要	Surface modification by loading a water oxidation co-catalyst (WOC) is generally considered an efficient means to optimize the sluggish surface oxygen evolution reaction (OER) of a hematite photoanode for photoelectrochemical (PEC) water oxidation. However, the surface WOC usually exerts little impact on the bulk charge separation of hematite. Herein, an ultrathin citrate-Ni0.9Co0.1(OH)x [Cit-Ni0.9Co0.1(OH)x] is conformally coated on the fluorine-doped hematite (F-Fe2O3) photoanode for PEC water oxidation to simultaneously promote the internal hole extraction and surface hole injection of the target photoanode. Besides, the conformally coated Cit-Ni0.9Co0.1(OH)x overlayer passivates the redundant surface trap states of F-Fe2O3. These factors result in a superior photocurrent density of 2.52 mA cm-2 at 1.23 V versus a reversible hydrogen electrode (V vs. RHE) for the target photoanode. Detailed investigation manifests that the hole extraction property in Cit-Ni0.9Co0.1(OH)x is mainly derived from the Ni sites, while Co incorporation endows the overlayer with more catalytic active sites. This synergistic effect between Ni and Co contributes to a rapid and continuous hole migration pathway from the bulk to the interface of the target photoanode, and then to the electrolyte for water oxidation. This journal is © The Royal Society of Chemistry.
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
出版者	Royal Society of Chemistry
WOS记录号	WOS:000684327200001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/151081]
专题	石油化工学院
作者单位	1.State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Catalytic Engineering of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Gansu, Lanzhou; 730000, China; 2.State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Ningxia, Yinchuan; 750021, China; 3.College of Petrochemical Technology, Lanzhou University of Technology, Langongping Road 287, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Wang, Peng,Li, Feng,Long, Xuefeng,et al. Bifunctional citrate-Ni0.9Co0.1(OH): Xlayer coated fluorine-doped hematite for simultaneous hole extraction and injection towards efficient photoelectrochemical water oxidation[J]. Nanoscale,2021,13(33):14197-14206.
APA	Wang, Peng.,Li, Feng.,Long, Xuefeng.,Wang, Tong.,Chai, Huan.,...&Jin, Jun.(2021).Bifunctional citrate-Ni0.9Co0.1(OH): Xlayer coated fluorine-doped hematite for simultaneous hole extraction and injection towards efficient photoelectrochemical water oxidation.Nanoscale,13(33),14197-14206.
MLA	Wang, Peng,et al."Bifunctional citrate-Ni0.9Co0.1(OH): Xlayer coated fluorine-doped hematite for simultaneous hole extraction and injection towards efficient photoelectrochemical water oxidation".Nanoscale 13.33(2021):14197-14206.