Electrodeposited Trimetallic NiFeW Hydroxide Electrocatalysts for Efficient Water Oxidation,ChemSusChem

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Electrodeposited Trimetallic NiFeW Hydroxide Electrocatalysts for Efficient Water Oxidation
ChemSusChem ( IF 7.5 ) Pub Date : 2020-12-30 , DOI: 10.1002/cssc.202002544
Rajmohan Rajendiran _{1,

2} , Deviprasath Chinnadurai ₃ , Kai Chen ₁ , Aravindha Raja Selvaraj ₃ , Kandasamy Prabakar ₃ , Oi Lun Li ₁

Affiliation

Tungsten‐doped Ni−Fe hydroxides fabricated on a three‐dimensional nickel foam through cathodic electrodeposition are proposed as effective oxygen evolution reaction (OER) catalysts for alkaline water oxidation. Incorporating an adequate amount of W into Ni−Fe hydroxides modulates the electronic structure by changing the local environment of Ni and Fe and create oxygen vacancies, resulting in abundant active sites for the OER. The optimized electrocatalyst, with a substantial number of catalytic sites, is found to outperform the well‐established 20 wt% Ir/C electrocatalyst. The catalyst only requires small overpotentials of 224 mV and 251 mV to generate current densities of 10 mA cm⁻² and 50 mA cm⁻², respectively, at an extremely low Tafel slope. Surface study after long‐term chronopotentiometry (ca. 30 h) reveals that the tungsten dopant undergoes reduction to stabilize the Ni and Fe active sites for predominant water oxidation. This research provides new insight to apply optimum amounts of tungsten doping to enable more significant electronic coupling within Ni−Fe for the chemisorption of hydroxy and oxygen intermediates and greatly improved OER activity.

中文翻译：

电沉积三金属NiFeW氢氧化物高效水氧化催化剂

有人提出通过阴极电沉积在三维泡沫镍上制造的掺钨镍铁氢氧化物，作为碱性水氧化的有效氧释放反应（OER）催化剂。在Ni-Fe氢氧化物中掺入适量的W，可以通过改变Ni和Fe的局部环境来调节电子结构，并产生氧空位，从而为OER提供了丰富的活性位点。发现具有大量催化位点的优化电催化剂性能优于公认的20 wt％Ir / C电催化剂。催化剂仅需要224 mV和251 mV的小过电位即可产生10 mA cm ^-2和50 mA cm ^-2的电流密度分别在极低的塔菲尔斜率下。长期计时电位法（约30小时）后的表面研究表明，钨掺杂剂经过还原以稳定Ni和Fe活性位点，从而使水显着氧化。这项研究为应用最佳钨掺杂量提供了新的见识，从而使Ni-Fe内能够进行更重要的电子偶联，从而对羟基和氧中间体进行化学吸附，并大大提高了OER活性。

更新日期：2021-03-07

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