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Pollen-like self-supported FeIr alloy for improved hydrogen evolution reaction in acid electrolyte
Journal of Energy Chemistry ( IF 13.1 ) Pub Date : 2021-09-09 , DOI: 10.1016/j.jechem.2021.08.066
Shengyu Ma 1, 2 , Jun Deng 3 , Yaping Xu 1 , Weiying Tao 1 , Xiaoqi Wang 1 , Zhiping Lin 1 , Qinghua Zhang 3 , Lin Gu 3 , Wenwu Zhong 1
Affiliation  

Ir is recognized as efficient catalyst for hydrogen evolution reaction (HER). The high price, however, has hindered its application in the production of hydrogen. In this work, we prepared the self-supported FeIr alloy nanoparticles, taking advantage of solid-state synthesis method. The as-prepared FeIr alloy possesses a novel morphology of pollen, which is consist of smaller FeIr nanoparticles. DFT calculations reveal that the change of the free Gibbs for Ir is negative after the adsorption of active H, while it is positive for the case of Fe. Thus, the alloying of Fe and Ir not only effectively reduces the cost, but also can achieve more adequate adsorption of active H species. Benefitting from this, the as-prepared FeIr alloy nanoparticle exhibits superior HER performance with an overpotential of 19 mV at a current density of 10 mV/cm2 and a Tafel slope of 32 mV/dec, when tested in 0.5 M H2SO4, better than pure Ir and Pt/C. This work paves the way to the exploration of efficient alloy electrocatalysts for HER.



中文翻译:

用于改善酸性电解质中析氢反应的类花粉自支撑 FeIr 合金

Ir 被认为是析氢反应 (HER) 的有效催化剂。然而,高昂的价格阻碍了其在氢气生产中的应用。在这项工作中,我们利用固态合成方法制备了自支撑 FeIr 合金纳米粒子。所制备的 FeIr 合金具有新的花粉形态,由较小的 FeIr 纳米颗粒组成。DFT 计算表明,吸附活性 H 后,Ir 的游离 Gibbs 变化为负值,而 Fe 为正值。因此,Fe和Ir的合金化不仅有效降低了成本,而且可以实现更充分的活性H物种吸附。受益于此,所制备的 FeIr 合金纳米颗粒表现出优异的 HER 性能,在 10 mV/cm 的电流密度下具有 19 mV 的过电位2和 32 mV/dec 的 Tafel 斜率,当在 0.5 MH 2 SO 4 中测试时,优于纯 Ir 和 Pt/C。这项工作为探索高效的 HER 合金电催化剂铺平了道路。

更新日期:2021-09-27
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