Highly efficient and stable Ru nanoparticle electrocatalyst for the hydrogen evolution reaction in alkaline conditions

Catalysis Science & Technology Pub Date : 2021-08-30 DOI:10.33774/chemrxiv-2021-2w10h

Frederik Søndergaard‐Pedersen, R. Tilley, J. J. Gooding, Tania M. Benedetti, Munkhshur Myekhlai, B. Iversen, E. Bøjesen, Harish Lakhotiya, Martin Bondesgaard

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引用次数: 2

Abstract

Developing alternatives to platinum-based electrocatalysts for the hydrogen evolution reaction (HER) is an important challenge for realizing the green transition. This is especially the case for alkaline conditions where Pt-based catalysts have very poor stability. Here, we demonstrate new solvothermal synthesis methods with facile allotropism control for selectively obtaining hexagonal-close-packed (hcp) and face-centered cubic (fcc) ruthenium nanoparticles. Both samples are highly active HER catalysts in alkaline conditions outperforming commercial Pt/C. However, the samples show markedly different stabilities. The hcp sample shows exceptional stability for 12 hours constant operation at 10 mA/cm2 with an overpotential that only increases 6 mV whereas the fcc sample increases 50 mV and the commercial Pt/C more than 350 mV. Thus, this study underlines the importance of controlling the crystal structure of nanoparticle electrocatalysts and shows the potential of using Ru as an alternative to Pt in alkaline conditions.

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碱性条件下高效稳定的Ru纳米粒子析氢电催化剂

开发铂基析氢反应电催化剂的替代品是实现绿色转型的重要挑战。特别是在碱性条件下，pt基催化剂的稳定性很差。在这里，我们展示了一种新的溶剂热合成方法，这种方法具有易于控制的同素异形体，可以选择性地获得六方密装(hcp)和面心立方(fcc)钌纳米颗粒。两种样品在碱性条件下都是高活性的HER催化剂，性能优于商用Pt/C。然而，样品表现出明显不同的稳定性。hcp样品在10 mA/cm2恒定工作12小时时表现出优异的稳定性，过电位仅增加6 mV，而fcc样品增加50 mV，商用Pt/C超过350 mV。因此，这项研究强调了控制纳米颗粒电催化剂晶体结构的重要性，并显示了在碱性条件下使用Ru作为Pt替代品的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Catalysis Science & Technology

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