Oxygen-modified Ru for efficient alkaline hydrogen evolution reaction

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2025-05-19 DOI:10.1039/d5dt00838g

Youpeng Cao, Xingshuai Lv, Jiao Yang, Keyu An, Chunfa Liu, Lulu Qiao, Zhichao Yu, Lun Li, Hui Pan

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Abstract

Ruthenium (Ru) is considered as a highly promising catalyst for hydrogen evolution reaction (HER) because of its similar d-band center to platinum and more affordable price. However, the catalytic activities of Ru-based materials remain insufficient for large-scale water electrolysis. In this work, we report that an oxygen-modified Ru catalyst (Ru/C-220) can achieve superior catalytic performance for HER with an overpotential of 18 mV at 10 mA cm-2, a Tafel slope of 34.9 mV dec-1, and around fivefold increase in mass activity at an overpotential of 100 mV compared to the unannealed catalyst. XPS characterization reveals that the catalyst after air annealing exhibits a higher content of lattice-O2- and tetravalent ruthenium (Ru4+), which are key factors contributing to performance enhancement. The underpotential deposited hydrogen (Hupd) tests and density-functional-theory (DFT) calculations further validate that the enhanced performance of Ru/C-220 stems from oxygen modification, which reduces and optimizes the *H adsorption energy at the Ru active sites. Anion exchange membrane water electrolysis (AEMWE) tests confirm the application potential of the oxygen-modified Ru.

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氧修饰Ru的高效碱性析氢反应

钌（Ru）具有与铂相似的d波段中心和更便宜的价格，被认为是极有前途的析氢反应（HER）催化剂。然而，钌基材料的催化活性对于大规模的水电解仍然不足。在这项工作中，我们报道了一种氧修饰的Ru催化剂（Ru/C-220）在10 mA cm-2时的过电位为18 mV， Tafel斜率为34.9 mV dec1，与未退火的催化剂相比，在100 mV过电位下的质量活性增加了约5倍。XPS表征表明，空气退火后的催化剂表现出更高的晶格o2 -和四价钌（Ru4+）含量，这是促进性能增强的关键因素。欠电位沉积氢（Hupd）测试和密度泛函理论（DFT）计算进一步验证了Ru/C-220性能的增强源于氧修饰，氧修饰降低并优化了Ru活性位点的*H吸附能。阴离子交换膜电解（AEMWE）试验证实了氧修饰钌的应用潜力。

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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来源期刊

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.