在钌掺杂石墨烯和氧空位中植入HxYO2−x位用于低过电位碱性析氢

IF 8.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Npg Asia Materials Pub Date : 2023-10-20 DOI:10.1038/s41427-023-00501-z
Xiang Li, Wei Deng, Yun Weng, Jingjing Zhang, Haifang Mao, Tiandong Lu, Wenqian Zhang, Renqiang Yang, Fei Jiang
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摘要

高效的析氢反应电催化剂是实现可持续氢能的必要条件。水分解氢能源的可控生产在很大程度上依赖于催化剂,寻求可持续、高效的水分解电催化剂对能源应用至关重要。本文制备了双金属RuYO 2−x纳米粒子(Ru: 8.84 at。通过简单的溶剂热策略,通过合成氢钇酮(H x YO 2 - x)作为插入介质,合成了高密度和低负载的氢钇酮(Y: 13 at.%)并锚定在石墨烯上。电镜观察表明,RuYO 2−x /C由致密排列的颗粒和石墨烯薄片组成。电化学结果表明,在碱性介质中,当电流密度为10 mA cm−2时,RuYO 2−x /C具有较低的过电位η 10 = 56 mV, Tafel斜率为63.18 mV dec−1,稳定时间为24 h。RuYO 2−x /C的氧空位提供了大的质子存储容量和强的结合氢原子的倾向。DFT计算表明,含有较多Ru-O-Y键和vo的RuYO 2−x/ C催化剂显著降低了H-OH键断裂的能垒。此外,强大的金属-载体相互作用为氢的吸附和解吸提供了优化的能量,这解释了在碱性电解质反应中RuYO 2−x /C催化氢沉淀的高活性和良好的动力学。提出了一种低负荷、高密度、高性能、稳定的水分解制氢催化剂的插氢方法。
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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Implanting HxYO2−x sites into Ru-doped graphene and oxygen vacancies for low-overpotential alkaline hydrogen evolution
Abstract Highly efficient electrocatalysts for the hydrogen evolution reaction (HER) are essential for sustainable hydrogen energy. The controllable production of hydrogen energy by water decomposition depends heavily on the catalyst, and it is extremely important to seek sustainable and highly efficient water-splitting electrocatalysts for energy applications. Herein, bimetallic RuYO 2 − x nanoparticles (Ru: 8.84 at.% and Y: 13 at.%) with high densities and low loadings were synthesized and anchored on graphene through a simple solvothermal strategy by synthesizing hydrogen yttrium ketone (H x YO 2 − x ) serving as an inserted medium. Electron microscopy demonstrated that the RuYO 2 − x /C was composed of densely arranged particles and graphene flakes. Electrochemical results showed that the RuYO 2 − x /C had a remarkably low overpotential of η 10 = 56 mV at a current density of 10 mA cm −2 in alkaline media, a Tafel slope of 63.18 mV dec −1 , and 24 h of stability. The oxygen vacancies of RuYO 2 − x /C provided a large proton storage capacity and a strong tendency to bind hydrogen atoms. DFT calculations showed that RuYO 2 − x/ C catalysts with more Ru-O-Y bonds and V O dramatically decreased the energy barrier for breaking H-OH bonds. Moreover, the robust metal-support interactions provided optimized energies for hydrogen adsorption and desorption, which explained the high activity and favorable kinetics for RuYO 2 − x /C catalytic hydrogen precipitation in alkaline electrolyte reactions. This work presents a hydrogen insertion method for the preparation of low-loading, high-density, high-performance and stable water decomposition catalysts for hydrogen production.
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来源期刊
Npg Asia Materials
Npg Asia Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
15.40
自引率
1.00%
发文量
87
审稿时长
2 months
期刊介绍: NPG Asia Materials is an open access, international journal that publishes peer-reviewed review and primary research articles in the field of materials sciences. The journal has a global outlook and reach, with a base in the Asia-Pacific region to reflect the significant and growing output of materials research from this area. The target audience for NPG Asia Materials is scientists and researchers involved in materials research, covering a wide range of disciplines including physical and chemical sciences, biotechnology, and nanotechnology. The journal particularly welcomes high-quality articles from rapidly advancing areas that bridge the gap between materials science and engineering, as well as the classical disciplines of physics, chemistry, and biology. NPG Asia Materials is abstracted/indexed in Journal Citation Reports/Science Edition Web of Knowledge, Google Scholar, Chemical Abstract Services, Scopus, Ulrichsweb (ProQuest), and Scirus.
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