Identifying the electrocatalytic sites of nickel disulfide in alkaline hydrogen evolution reaction

Qiuyu Ma; Chengyi Hu; Kunlong Liu; Sung Fu Hung; Daohui Ou; Hao Ming Chen; Gang Fu; Nanfeng Zheng

doi:10.1016/j.nanoen.2017.09.036

Identifying the electrocatalytic sites of nickel disulfide in alkaline hydrogen evolution reaction

Qiuyu Ma, Chengyi Hu, Kunlong Liu, Sung Fu Hung, Daohui Ou, Hao Ming Chen^*, Gang Fu, Nanfeng Zheng

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摘要

Transition-metal chalcogenides have attracted great attention for their superior catalytic activity towards hydrogen evolution reaction (HER) as an alternative to platinum. Here we report a facile method for synthesizing two-dimensional nickel disulfide (NiS₂) by using Ni(OH)₂ on nickel foam as substrate. The as-synthesized NiS₂ displayed an activation period during HER with a remarkable structural and compositional change under alkaline conditions. Electrochemical in situ X-ray absorption spectroscopy revealed that metallic Ni acted as catalytic active species with superior activity of 67 mV to reach 10 mA cm⁻². The in situ generated metallic Ni were easily oxidized to large-area ultrathin Ni(OH)₂ when exposed to air. The overall water splitting device was fabricated by using NiS₂-derived metallic Ni and Fe doped NiS₂-derived hydroxide as HER and OER electrode with a potential of 1.52 V to reach 10 mA cm⁻².

原文	English
頁（從 - 到）	148-153
頁數	6
期刊	Nano Energy
卷	41
DOIs	https://doi.org/10.1016/j.nanoen.2017.09.036
出版狀態	Published - 11月 2017

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@article{ac4850c3c82d41f0a2d8fbeef09b713c,

title = "Identifying the electrocatalytic sites of nickel disulfide in alkaline hydrogen evolution reaction",

abstract = "Transition-metal chalcogenides have attracted great attention for their superior catalytic activity towards hydrogen evolution reaction (HER) as an alternative to platinum. Here we report a facile method for synthesizing two-dimensional nickel disulfide (NiS2) by using Ni(OH)2 on nickel foam as substrate. The as-synthesized NiS2 displayed an activation period during HER with a remarkable structural and compositional change under alkaline conditions. Electrochemical in situ X-ray absorption spectroscopy revealed that metallic Ni acted as catalytic active species with superior activity of 67 mV to reach 10 mA cm−2. The in situ generated metallic Ni were easily oxidized to large-area ultrathin Ni(OH)2 when exposed to air. The overall water splitting device was fabricated by using NiS2-derived metallic Ni and Fe doped NiS2-derived hydroxide as HER and OER electrode with a potential of 1.52 V to reach 10 mA cm−2.",

keywords = "2D material, Electrocatalysis, Electrocatalytic site, HER, Metal chalcogenides, Nickel disulfide",

author = "Qiuyu Ma and Chengyi Hu and Kunlong Liu and Hung, {Sung Fu} and Daohui Ou and Chen, {Hao Ming} and Gang Fu and Nanfeng Zheng",

year = "2017",

month = nov,

doi = "10.1016/j.nanoen.2017.09.036",

language = "English",

volume = "41",

pages = "148--153",

journal = "Nano Energy",

issn = "2211-2855",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Identifying the electrocatalytic sites of nickel disulfide in alkaline hydrogen evolution reaction

AU - Ma, Qiuyu

AU - Hu, Chengyi

AU - Liu, Kunlong

AU - Hung, Sung Fu

AU - Ou, Daohui

AU - Chen, Hao Ming

AU - Fu, Gang

AU - Zheng, Nanfeng

PY - 2017/11

Y1 - 2017/11

N2 - Transition-metal chalcogenides have attracted great attention for their superior catalytic activity towards hydrogen evolution reaction (HER) as an alternative to platinum. Here we report a facile method for synthesizing two-dimensional nickel disulfide (NiS2) by using Ni(OH)2 on nickel foam as substrate. The as-synthesized NiS2 displayed an activation period during HER with a remarkable structural and compositional change under alkaline conditions. Electrochemical in situ X-ray absorption spectroscopy revealed that metallic Ni acted as catalytic active species with superior activity of 67 mV to reach 10 mA cm−2. The in situ generated metallic Ni were easily oxidized to large-area ultrathin Ni(OH)2 when exposed to air. The overall water splitting device was fabricated by using NiS2-derived metallic Ni and Fe doped NiS2-derived hydroxide as HER and OER electrode with a potential of 1.52 V to reach 10 mA cm−2.

AB - Transition-metal chalcogenides have attracted great attention for their superior catalytic activity towards hydrogen evolution reaction (HER) as an alternative to platinum. Here we report a facile method for synthesizing two-dimensional nickel disulfide (NiS2) by using Ni(OH)2 on nickel foam as substrate. The as-synthesized NiS2 displayed an activation period during HER with a remarkable structural and compositional change under alkaline conditions. Electrochemical in situ X-ray absorption spectroscopy revealed that metallic Ni acted as catalytic active species with superior activity of 67 mV to reach 10 mA cm−2. The in situ generated metallic Ni were easily oxidized to large-area ultrathin Ni(OH)2 when exposed to air. The overall water splitting device was fabricated by using NiS2-derived metallic Ni and Fe doped NiS2-derived hydroxide as HER and OER electrode with a potential of 1.52 V to reach 10 mA cm−2.

KW - 2D material

KW - Electrocatalysis

KW - Electrocatalytic site

KW - HER

KW - Metal chalcogenides

KW - Nickel disulfide

UR - http://www.scopus.com/inward/record.url?scp=85029696764&partnerID=8YFLogxK

U2 - 10.1016/j.nanoen.2017.09.036

DO - 10.1016/j.nanoen.2017.09.036

M3 - Article

AN - SCOPUS:85029696764

SN - 2211-2855

VL - 41

SP - 148

EP - 153

JO - Nano Energy

JF - Nano Energy

ER -

Identifying the electrocatalytic sites of nickel disulfide in alkaline hydrogen evolution reaction

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