Low electronegativity Mn bulk doping intensifies charge storage of Ni2P redox shuttle for membrane-free water electrolysis

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	Low electronegativity Mn bulk doping intensifies charge storage of Ni2P redox shuttle for membrane-free water electrolysis
	Liu, Zichen; Zhang, Gong; Zhang, Kai; Lan, Huachun; Liu, Huijuan; Qu, Jiuhui
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2020-02-21
卷号	8 期号:7 页码:4073-4082
ISSN号	2050-7488
英文摘要	A high efficiency electrochemical energy storage and high areal capacitance solid-state mediator can act as an energy vector to solve the key problem in mixtures of H-2 and O-2 in electrically driven water splitting architectures. It is believed that introducing foreign metal atoms into a monometallic compound could promote the energy storage capacity of the mediator. Herein, based on the theoretical prediction that partial substitution of low electronegativity Mn in the Ni2P structure could enhance the local charge density around Ni and lower the rate-determining Gibbs free energy difference (Delta G(OOH)-Delta G(O)) compared to Fe substitution or the pure compound, a supercapacitor-type transition metal phosphide (TMP) mediator Ni-Mn-P with an areal capacitance of 12.25 F cm(-1) is fabricated. Benefitting from the enhanced energy storage activity and high exposure of active sites, the charge storage in the H-2 generation step in a 1 cm(2) Ni-Mn-P mediator electrode when coupled with Ni2P/NF bifunctional electrodes maintains >500 s O-2 evolution (10 mA), similar to 4 times longer than that of an unsubstituted Ni-P mediator. In addition, the superior stability for >20 000 s cycle operation at 20 mA further demonstrates its operational flexibility and potential for practical application.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44957]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Liu, Zichen,Zhang, Gong,Zhang, Kai,et al. Low electronegativity Mn bulk doping intensifies charge storage of Ni2P redox shuttle for membrane-free water electrolysis[J]. JOURNAL OF MATERIALS CHEMISTRY A,2020,8(7):4073-4082.
APA	Liu, Zichen,Zhang, Gong,Zhang, Kai,Lan, Huachun,Liu, Huijuan,&Qu, Jiuhui.(2020).Low electronegativity Mn bulk doping intensifies charge storage of Ni2P redox shuttle for membrane-free water electrolysis.JOURNAL OF MATERIALS CHEMISTRY A,8(7),4073-4082.
MLA	Liu, Zichen,et al."Low electronegativity Mn bulk doping intensifies charge storage of Ni2P redox shuttle for membrane-free water electrolysis".JOURNAL OF MATERIALS CHEMISTRY A 8.7(2020):4073-4082.