中山大学李光琴团队报道了V₈C₇/C稳定的超细钌纳米粒子在所有pH下增强析氢反应。相关研究成果于2024年1月11日发表在国际顶尖学术期刊《科学通报》。

开发用于析氢反应（HER）的具有高效率和长期耐久性的经济高效的电催化剂，在水分解领域仍然是一个巨大的挑战。

该文中，研究人员通过金属-有机框架V-BDC（BDC:1,4-苯二甲酸酯）的热解，设计了一种稳定在多孔V8C7/C基质上的超细且高度分散的Ru纳米颗粒。所获得的Ru-V₈C₇/C复合材料在所有pH范围内都表现出优异的HER性能。在40mV的过电位下，其质量活性分别是商用Pt/C在酸性、中性和碱性介质中的1.9倍、4.1倍和9.4倍。

同时，Ru-V₈C₇/C在所有pH范围内都表现出显著的高稳定性，特别是可以在1.0mol L^-1磷酸盐缓冲盐水（PBS）中保持10mA cm^-2的电流密度超过150小时。这种出色的HER性能可归因于Ru物种的高内在活性及其与V₈C₇/C底物的强界面相互作用。表面丰富的活性位点和界面上形成的Ru–C–V单元的协同作用促进了反应中间体的吸附和活性位点的释放，有助于快速HER动力学。

该项工作为通过表面和界面调节pH耐受性开发多功能和坚固的HER催化剂提供了参考。

附：英文原文

Title: Ultrafine Ru nanoparticles stabilized by V8C7/C for enhanced hydrogen evolution reaction at all pH

Author: anonymous

Issue&Volume: 2024/01/11

Abstract: The development of cost-effective electrocatalysts with high efficiency and long durability for hydrogen evolution reaction (HER) remains a great challenge in the field of water splitting. Herein, we design an ultrafine and highly dispersed Ru nanoparticles stabilized on porous V8C7/C matrix via pyrolysis of the metal–organic frameworks V-BDC (BDC: 1,4-benzenedicarboxylate). The obtained Ru-V8C7/C composite exhibits excellent HER performance in all pH ranges. At the overpotential of 40 mV, its mass activity is about 1.9, 4.1 and 9.4 times higher than that of commercial Pt/C in acidic, neutral and alkaline media, respectively. Meanwhile, Ru-V8C7/C shows the remarkably high stability in all pH ranges which, in particular, can maintain the current density of 10 mA cm2 for over 150 h in 1.0 mol L1 phosphate buffer saline (PBS). This outstanding HER performance can be attributed to the high intrinsic activity of Ru species and their strong interface interactions to the V8C7/C substrate. The synergistic effect of abundant active sites on the surface and the formed Ru–C–V units at the interface promotes the adsorption of reaction intermediates and the release of active sites, contributing the fast HER kinetics. This work provides a reference for developing versatile and robust HER catalysts by surface and interface regulation for pH tolerance.

DOI: 10.1016/j.scib.2024.01.014

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927324000276