Homogeneous Nanoporous Ni Particles Produced by Dealloying Mg-Based Metallic Glass as Efficient Hydrogen Evolution Electrocatalyst
Homogeneous Nanoporous Ni Particles Produced by Dealloying Mg-Based Metallic Glass as Efficient Hydrogen Evolution Electrocatalyst
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镁基金属玻璃脱合金制备的均质纳米多孔镍颗粒作为高效析氢电催化剂
DOI：
10.1149/2.1051803jes
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发表时间：
2018-03
影响因子：
3.9
通讯作者：
Tao Zhang
中科院分区：
文献类型：
--
作者：
Lei Zuo;Ran Li;Yu Jin;Tao Zhang
脱合金法是制备纳米多孔金属的一种简便方法。通常情况下，在脱合金过程中纳米多孔结构的形成伴随着宏观体积的减小，本文利用这一点，在（NH 4）2SO 4水溶液中通过超声辅助脱合金Mg-Ni-La金属玻璃带制备了均匀的纳米多孔Ni（np-Ni）颗粒。通过调节金属玻璃带的厚度可以制备出不同形状的颗粒。np-Ni颗粒具有韧带孔结构，具有53 m2 g-1的高比表面积。讨论了粒子的形成过程和韧带结构。纳米镍可作为一种高效的析氢反应电催化剂。要达到100 mA cm− 2的高电流密度，仅需46 mV，小塔菲尔斜率为21 mV dec− 1。此外，由于Mg和La在碱性介质中的化学稳定性以及对纳米颗粒的韧带孔结构的牢固支撑，使得纳米颗粒在电解水过程中具有良好的催化稳定性，且至少20 h内过电位没有任何增加。预计目前的催化剂可以使负担得起的水裂解系统的制造成为可能。
Dealloying is a facile method to prepare nanoporous metals. Normally, the formation of nanoporous structure during dealloying is accompanied by a macroscopic volume reduction, which is utilized herein to prepare homogeneous nanoporous Ni (np-Ni) particles by ultrasonic-assisted dealloying Mg-Ni-La metallic glass ribbons in (NH 4) 2 SO 4 aqueous solution. Particles with different shapes can be fabricated by adjusting the thickness of the metallic glass ribbons. The np-Ni particles exhibit a ligament-pore structure with a high specific surface area of 53 m 2 g− 1. The process for particle formation and the ligament structure are discussed. The np-Ni can be applied as an efficient electrocatalyst for hydrogen evolution reaction (HER). To reach a high current density of 100 mA cm− 2, it requires merely 46 mV with a small Tafel slope of 21 mV dec− 1. Furthermore, the np-Ni particles have a good catalytic stability during water electrolysis without any increase of overpotential for at least 20 h, which may be attributed to the chemical stability of Mg and La in alkaline media and the firm support of the ligament-pore structure. It is expected that the current catalyst can enable the manufacturing of affordable water splitting systems.
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影响因子：
2.9
作者：
P. Los;A. Rami;A. Lasia
通讯作者：
P. Los;A. Rami;A. Lasia
通过在柠檬酸溶液中脱合金 Mg-Ni-Y 金属玻璃制备三维纳米多孔镍用于高性能储能
影响因子：
3.9
作者：
Ran Li;Yu Jin;Hongjie Xu;Tao Zhang
通讯作者：
Tao Zhang
影响因子：
15
作者：
Popczun, Eric J.;McKone, James R.;Schaak, Raymond E.
通讯作者：
Schaak, Raymond E.
DOI：
10.1039/b919313h
发表时间：
2010-02
期刊：
Physical chemistry chemical physics : PCCP
影响因子：
--
作者：
Qian Zhang;Zhonghua Zhang
通讯作者：
Qian Zhang;Zhonghua Zhang
影响因子：
5.5
作者：
F. Devred;B. Hoffer;W. Sloof;P. Kooyman;A. D. Langeveld;H. Zandbergen
通讯作者：
F. Devred;B. Hoffer;W. Sloof;P. Kooyman;A. D. Langeveld;H. Zandbergen