High-activity electrodeposited NiW catalysts for hydrogen evolution in alkaline water electrolysis
High-activity electrodeposited NiW catalysts for hydrogen evolution in alkaline water electrolysis
复制标题
DOI：
10.1016/j.apsusc.2015.05.040
复制
发表时间：
2015-09
影响因子：
6.7
通讯作者：
Sung-Hoon Hong;S. Ahn;J. Choi;Jin Yeong Kim;Hoy-Jin Kim;Hyoung‐Juhn Kim;J. Jang;Haekyoung Kim;Soo‐Kil Kim
中科院分区：
文献类型：
--
作者：
Sung-Hoon Hong;S. Ahn;J. Choi;Jin Yeong Kim;Hoy-Jin Kim;Hyoung‐Juhn Kim;J. Jang;Haekyoung Kim;Soo‐Kil Kim
采用共电沉积方法在铜箔基底上制备 NiW 合金催化剂，用于碱性水电解中的析氢反应（HER）。通过改变电解液中[W6+]/[Ni2+]的摩尔比，可以在很宽的范围内控制合金催化剂的组成。当沉积催化剂中的 W 含量较高 (∼41 at.%) 时，与电沉积 Ni 相比，NiW 合金的形貌显示出巨大的变化，特别是表面覆盖率和聚集体尺寸显着下降。所有沉积在含柠檬酸盐浴中的 NiW 合金均表现出非晶结构，无论 W 含量如何。采用重复循环伏安法 (CV) 的电化学测量表明，与纯 Ni 催化剂相比，NiW 合金催化剂的 HER 活性增强。 W 含量为 41 at.% 时获得最大 HER 活性；合金化效应，包括形态变化，以及该合金的非晶结构表现出的高吸氢亲和力是增强 HER 活性的主导因素。本文提出的结果提供了 NiW 合金材料性能与 HER 活性之间重要关系的先进信息。
NiW alloy catalysts were prepared on a Cu foil substrate by using a co-electrodeposition method for use in the hydrogen evolution reaction (HER) in alkaline water electrolysis. The compositions of the alloy catalysts were controlled over a wide range by varying the molar ratio [W6+]/[Ni2+] in the electrolyte. At high W contents (∼41 at.%) in the deposited catalyst, the morphologies of the NiW alloys showed drastic changes compared with those of electrodeposited Ni, in particular a significant decrease in surface coverage and aggregates’ sizes. All of NiW alloys deposited in a citrate-containing bath demonstrated an amorphous structure, regardless of W content. Electrochemical measurements employing repeated cyclic voltammetry (CV) showed enhanced HER activities for the NiW alloy catalysts compared with the pure Ni catalyst. The maximum HER activity was obtained with a W content of 41 at.%; the alloying effects, including morphological changes, and the high affinity for hydrogen absorption shown by this alloy's amorphous structure are dominant factors in the enhanced HER activity. The results presented herein provide advanced information of significant relationship between material properties and HER activity of NiW alloys.