Powder metallurgy synthesis of porous NiMo alloys as efficient electrocatalysts to enhance the hydrogen evolution reaction

Powder metallurgy synthesis of porous NiMo alloys as efficient electrocatalysts to enhance the hydrogen evolution reaction
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粉末冶金合成多孔 NiMo 合金作为高效电催化剂以增强析氢反应

DOI:
10.1016/j.jallcom.2021.158901
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发表时间:
2021-06
影响因子:
6.2
通讯作者:
Junming Luo
Junming Luo
中科院分区:
材料科学2区
文献类型:
--
作者:
J.L. Xu;L.L. Li;Junwang Tang;Liming Dai;Xibao Li;Zhiguo Ye;Junming Luo

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摘要电化学水裂解被认为是实现氢经济最有潜力的策略之一。本文采用微波烧结粉末冶金法设计并合成了多孔NiMo合金作为高效电催化剂。所制备的多孔NiMo合金在碱性电解液(1.0M KOH)中表现出优异的析氢反应性能和优异的耐久性。特别是,多孔Ni 6 Mo 4合金在10 mAcm-2的电流密度下表现出较小的过电位(37 mV)和较低的塔菲尔斜率(82.1mV dec-1)。Ni 6 Mo 4合金的电催化性能主要是由于Ni、Mo和NiMo金属间化合物的协同作用,以及更多的活性中心和更快的电荷转移速率。
Abstract Electrochemical water splitting is considered to be one of the most potential strategies to achieve the hydrogen economy. In this paper, the porous NiMo alloys used as efficient electrocatalysts were designed and synthesized by microwave sintering powder metallurgy method. The as-prepared porous NiMo alloys as good electrocatalysts exhibit excellent hydrogen evolution reaction (HER) performance and outstanding durability in alkaline electrolyte (1.0M KOH). Especially, the porous Ni6Mo4 alloy shows smaller overpotential of 37mV at current density of 10mAcm−2 and a low Tafel slope of 82.1mV dec−1. The efficient electrocatalytic performance of Ni6Mo4 alloy can be attributed to the synergies of Ni, Mo and NiMo intermetallic compound, more active sites and quicker charge transfer rate.
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