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题名: From water reduction to oxidation: Janus Co-Ni-P nanowires as high-efficiency and ultrastable electrocatalysts for over 3000 h water splitting
作者: Li, Wei1; Gao, Xuefei2; Wang, Xiaoguang1; Xiong, Dehua1; Huang, Pei-Pei2; Song, Wei-Guo2; Bao, Xiaoqing1; Liu, Lifeng1
关键词: Co-Ni-P nanowire ; Water splitting ; Oxygen evolution ; Hydrogen evolution ; Bifunctional electrocatalyst
刊名: JOURNAL OF POWER SOURCES
发表日期: 2016-10-31
卷: 330, 页:156-166
收录类别: SCI
英文摘要: Vertically-aligned cobalt nickel phosphide nanowires (Co-Ni-P NWs) are synthesized on Ni foam by phosphorizing cobalt carbonate hydroxide precursor NWs in red phosphorous vapor at an elevated temperature. The as-fabricated self-supported integrated electrode (Ni@Co-Ni-P) exhibits outstanding electrocatalytic activity for the hydrogen evolution reaction (HER) in alkaline solution, delivering a cathodic current density of 100 mA cm(-2) at a small overpotential of 137 mV and a Tafel slope of 65.1 mV dec(-1). Furthermore, the electrode shows remarkable catalytic performance towards the oxygen evolution reaction (OER), affording an anodic current density of 90.2 mA cm(-2) at an overpotential of 350 mV, superior to many other transition metal based OER catalysts. Given the well-defined bifunctionality, an alkaline electrolyzer is assembled using two symmetrical Ni@Co-Ni-P as the cathode and anode, respectively, which demonstrates outstanding catalytic performance for sustained water splitting at varying current densities from 10 to 240 mA cm(-2). Significantly, the Ni@Co-Ni-P electrolyzer is able to operate for 3175 h (ca. 132 days) without degradation at an industry-relevant current density of 100 mA cm(-2), leading to exceptionally high H-2 production rate of 311 mmol h(-1) catalyst cm(-2) with an energy efficiency of 76% at ca. 1.9 V. (C) 2016 Elsevier B.V. All rights reserved.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35472
Appears in Collections:分子纳米结构与纳米技术实验室_期刊论文

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作者单位: 1.Int Iberian Nanotechnol Lab INL, Av Mestre Jose Veiga, P-4715330 Braga, Portugal
2.Chinese Acad Sci, Inst Chem, Key Lab Mol Nanostruct & Nanotechnol, Beijing Natl Lab Mol Sci, 2 North First St, Beijing 100190, Peoples R China
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