过电位
磷化物
电催化剂
催化作用
钌
阳极
材料科学
纳米颗粒
电化学
化学工程
无机化学
电极
纳米技术
化学
物理化学
生物化学
工程类
作者
Jing Wang,Yuzhe Cao,Mingyang Wei,Xiang Peng,Xiaoqing Ma,Xiaolei Yuan,Yong Xiang,Zhao Cai
出处
期刊:Catalysts
[MDPI AG]
日期:2024-07-31
卷期号:14 (8): 491-491
标识
DOI:10.3390/catal14080491
摘要
Tuning the chemical and structural environment of Ru-based nanomaterials is a major challenge for achieving active and stable hydrogen evolution reaction (HER) electrocatalysis. Here, we anchored ultrafine Ru nanoparticles (with a size of ~4.2 nm) on a hierarchical Ni2P array (Ru/Ni2P) to enable highly efficient HER. The Ni2P promoter weakened the adsorption of proton on Ru sites by accepting electrons from Ru nanoparticles. Moreover, the hierarchical Ni2P endowed Ru catalysts with a large surface area and stable open structure. Consequently, the as-fabricated Ru/Ni2P electrode displayed a low overpotential of 57 and 164 mV at the HER current densities of 10 and 50 mA cm−2, respectively, comparable to the state-of-the-art Pt catalysts. Moreover, the Ru/Ni2P electrode can operate stably for 96 h at 50 mA cm−2 without performance degradation. After pairing with a commercial RuO2 anode, the Ru/Ni2P anode catalyzed overall water splitting at 1.73 V with a current density of 10 mA cm−2, which was 0.16 V lower than its commercial Ni counterpart. In situ Raman studies further revealed the optimized proton adsorption at the Ru-active sites on Ni2P promoter, thus enhancing the electrocatalytic HER performance.
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