In situ formation of a 3D core/shell structured Ni3N@Ni–Bi nanosheet array: an efficient non-noble-metal bifunctional electrocatalyst toward full water splitting under near-neutral conditions
In situ formation of a 3D core/shell structured Ni3N@Ni–Bi nanosheet array: an efficient non-noble-metal bifunctional electrocatalyst toward full water splitting under near-neutral conditions
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DOI：
10.1039/c7ta02333b
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发表时间：
2017-05
影响因子：
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通讯作者：
Lisi Xie;Fengli Qu;Zhiang Liu;Xiang Ren;S. Hao;Ruixiang Ge;Gu Du;Abdullah M. Asiri;Xuping Sun-Xupi
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文献类型：
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作者：
Lisi Xie;Fengli Qu;Zhiang Liu;Xiang Ren;S. Hao;Ruixiang Ge;Gu Du;Abdullah M. Asiri;Xuping Sun-Xupi
开发在温和pH条件下高效全水分解的非贵金属双功能催化剂具有重要意义，但仍是一个关键挑战。在本文中，我们报道了在钛网（Ni3N@Ni -Bi NS/Ti）支撑的金属Ni3N纳米片阵列上超薄Ni-Bi层的原位电化学开发，作为一种耐用的3D核/壳结构纳米阵列电催化剂，用于近中性pH下的水氧化。Ni3N@Ni -Bi NS/Ti需要405和382 mV的过电位，才能在0.1和0.5 M K-Bi (pH：9.2)，在良性条件下，活性优于Ni3N NS/Ti和大多数已报道的非贵金属催化剂。它还可以有效地用于需要265 mV过电位和10 mA cm - 2的析氢反应，其双电极电解槽在25°C、0.5 M K-Bi、1.95 V电池电压下提供10 mA cm - 2。
It is of great importance but still remains a key challenge to develop non-noble-metal bifunctional catalysts for efficient full water splitting under mild pH conditions. In this communication, we report the in situ electrochemical development of an ultrathin Ni–Bi layer on a metallic Ni3N nanosheet array supported on a Ti mesh (Ni3N@Ni–Bi NS/Ti) as a durable 3D core/shell structured nanoarray electrocatalyst for water oxidation at near-neutral pH. The Ni3N@Ni–Bi NS/Ti demands overpotentials of 405 and 382 mV to deliver a geometrical catalytic current density of 10 mA cm−2 in 0.1 and 0.5 M K–Bi (pH: 9.2), respectively, superior in activity to Ni3N NS/Ti and most reported non-precious metal catalysts under benign conditions. It also performs efficiently for the hydrogen evolution reaction requiring an overpotential of 265 mV for 10 mA cm−2 and its two-electrode electrolyser affords 10 mA cm−2 at a cell voltage of 1.95 V in 0.5 M K–Bi at 25 °C.