First electrochemical synthesis of mesoporous RhNi alloy films for an alkali-mediated hydrogen evolution reaction
First electrochemical synthesis of mesoporous RhNi alloy films for an alkali-mediated hydrogen evolution reaction
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DOI：
10.1039/d0ta09348c
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发表时间：
2021-02
影响因子：
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通讯作者：
Kenya Kani;Hyunsoo Lim;A. Whitten;K. Wood;A. Yago;M. S. Hossain;Joel Henzie;Jongbeom Na;Y. Yamauchi
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文献类型：
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作者：
Kenya Kani;Hyunsoo Lim;A. Whitten;K. Wood;A. Yago;M. S. Hossain;Joel Henzie;Jongbeom Na;Y. Yamauchi
合成由具有不同反应性和标准氧化还原电位（E0）的金属组成的介孔合金是具有挑战性的，因为金属沉积的动力学完全不同。在此，我们报道了第一种利用自组装胶束模板通过电化学共沉积制备介孔RhNi合金薄膜的方法。Rh前体（Rh3+）的浓度对于控制反应动力学和形态是至关重要的，因为Rh沉积是Ni共沉积的触发器。Rh3+：Ni2+（在前体中）可以被改变以产生不同的合金组合物，并且还研究了pH和沉积电位的影响。我们研究了介孔RhNi薄膜作为析氢反应（HER）的电催化电极。Ni掺杂用于增强介孔膜的HER性能，并且1：1合金（介孔Rh49Ni51膜）显示出最佳性能，在10 mA cm−2下的过电位为59 mV，塔菲尔斜率为67 mV dec−1。这里获得的洞察力将使研究人员能够用不同的贵过渡金属合金进行实验，以产生更好的多孔电极用于电催化。
Synthesizing mesoporous alloys composed of metals with divergent reactivities and standard redox potentials (E0) is challenging because the kinetics of metal deposition is totally different. Herein, we report the first method to generate mesoporous RhNi alloy films via electrochemical co-deposition using self-assembled micelle templates. The concentration of Rh precursor (Rh3+) is crucial to control reaction kinetics and morphology because Rh deposition is the trigger of Ni co-deposition. The ratio of Rh3+ : Ni2+ (in the precursor) can be altered to generate different alloy compositions, and the impact of pH and deposition potentials is also investigated. We examine the mesoporous RhNi films as electrocatalytic electrodes for the hydrogen evolution reaction (HER). Ni-doping serves to enhance the HER performance of the mesoporous films, and the 1 : 1 alloy (mesoporous Rh49Ni51 film) shows the best performance with the overpotential of 59 mV @ 10 mA cm−2 and Tafel slope of 67 mV dec−1. The insight gained here will enable researchers to experiment with different noble-transition metal alloys to generate better porous electrodes for electrocatalysis.