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Aggregates of Ni/Ni(OH)2/NiOOH Nanoworms on Carbon Cloth for Electrocatalytic Hydrogen Evolution
Langmuir ( IF 3.7 ) Pub Date : 2020-11-09 , DOI: 10.1021/acs.langmuir.0c02548
Divya Rathore 1 , Mamta Devi Sharma 1 , Aditya Sharma 1 , Mrinmoyee Basu 1 , Surojit Pande 1
Affiliation  

The development of an efficient electrocatalyst for hydrogen evolution reaction (HER) is essential to facilitate the practical application of water splitting. Here, we aim to develop an electrocatalyst, Ni/Ni(OH)2/NiOOH, via electrodeposition technique on carbon cloth, which shows efficient activity and durability for HER in an alkaline medium. Phase purity and morphology of the electrodeposited catalyst are determined using powder X-ray diffraction and electron microscopic techniques. The compositional and thermal stability of the catalyst is checked using X-ray photoelectron spectroscopy and thermogravimetry analysis. Electrodeposited Ni/Ni(OH)2/NiOOH material is an efficient, stable, and low-cost electrocatalyst for hydrogen evolution reaction in a 1.0 M KOH medium. The catalyst exhibits remarkable performance, achieving a current density of 10 mA/cm2 at a potential of −0.045 V vs reversible hydrogen electrode (RHE), and the Tafel slope value is 99.6 mV/dec. The overall electrocatalytic water splitting mechanism using Ni/Ni(OH)2/NiOOH catalyst is well explained, where formation and desorption of OH ion on the catalyst surface are significant at alkaline pH. The developed electrocatalyst shows significant durability up to 200 h in a negative potential window in a highly corrosive alkaline environment along with efficient activity. The electrocatalyst can generate 165.6 μmol of H2 in ∼145 min of reaction time with 81.5% faradic efficiency.

中文翻译:

Ni / Ni(OH)2 / NiOOH纳米蠕虫在碳布上的聚集体,用于电催化制氢

开发用于氢析出反应(HER)的高效电催化剂对于促进水分解的实际应用至关重要。在这里,我们旨在通过在碳布上的电沉积技术开发一种电催化剂Ni / Ni(OH)2 / NiOOH,该催化剂在碱性介质中显示出对HER的有效活性和耐久性。使用粉末X射线衍射和电子显微镜技术确定电沉积催化剂的相纯度和形态。使用X射线光电子能谱和热重分析法检查催化剂的组成和热稳定性。电沉积Ni / Ni(OH)2/ NiOOH材料是一种在1.0 M KOH介质中用于氢释放反应的高效,稳定且低成本的电催化剂。该催化剂表现出非凡的性能,相对于可逆氢电极(RHE),在-0.045 V的电势下,电流密度达到10 mA / cm 2,Tafel斜率值为99.6 mV / dec。很好地解释了使用Ni / Ni(OH)2 / NiOOH催化剂的整体电催化水分解机理,其中OH的形成和解吸在碱性pH下,催化剂表面的离子非常重要。所开发的电催化剂在高度腐蚀的碱性环境中,在负电势窗口中可显示高达200小时的显着耐久性,并具有有效的活性。在约145分钟的反应时间内,电催化剂可产生165.6μmolH 2,法拉第效率为81.5%。
更新日期:2020-11-25
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