Characterization of Ni, NiMo, NiW and NiFe electroactive coatings as electrocatalysts for hydrogen evolution in an acidic medium
Characterization of Ni, NiMo, NiW and NiFe electroactive coatings as electrocatalysts for hydrogen evolution in an acidic medium
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DOI：
10.1016/j.molcata.2004.10.029
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发表时间：
2005-02-15
影响因子：
--
通讯作者：
Omanovic, S
中科院分区：
文献类型：
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作者：
Navarro-Flores, E;Chong, ZW;Omanovic, S
本文研究了左侧过渡金属（Fe、Mo、W）合金化Ni对酸性环境中析氢电催化活性的影响。在研究中使用了许多实验技术（直流和交流电化学技术，XRD，SEM，EDS和ICP）。结果清楚地表明，当与纯镍相比时，镍与Fe、Mo或W的合金化导致析氢的电催化活性增加。两种效果被认为是负责所观察到的行为;增加表面粗糙度和内在的活性的材料。Ni7.3Mo被发现产生最高的整体电催化活性之间的调查材料，主要是由于最高的表面粗糙度，而Ni3.4W被发现产生最高的本征电催化活性，这是解释的基础上修改的d-轨道上的电子密度与钨合金化镍。还注意到结晶度的增加可以有助于增加析氢中的电催化活性。(C)2004 Elsevier B. V.保留所有权利。
The paper reports a study on the influence of alloying nickel by left-hand side transition metals (Fe, Mo, W) on the electrocatalytic activity in hydrogen evolution in an acidic environment. A number of experimental techniques were used in research (dc and ac electrochemical techniques, XRD, SEM, EDS, and ICP). The results clearly demonstrate that alloying nickel with Fe, Mo or W results in an increased electrocatalytic activity in hydrogen evolution when compared to pure nickel. Two effects were found to be responsible for the observed behavior; an increase in surface roughness and intrinsic activity of the material. Ni7.3Mo was found to yield the highest overall electrocatalytic activity among the investigated materials mainly due the highest surface roughness, while Ni3.4W was found to yield the highest intrinsic electrocatalytic activity, which is explained on the basis of the modification of electron density in d-orbitals upon alloying nickel with tungsten. It was also noticed that an increase in crystallinity can contribute to an increased electrocatalytic activity in hydrogen evolution. (C) 2004 Elsevier B.V. All rights reserved.