Boosting the Hydrogen Evolution Performance of Ultrafine Ruthenium Electrocatalysts by a Hierarchical Phosphide Array Promoter

Author:

Wang Jing1,Cao Yuzhe1,Wei Mingyang1,Xiang Pengbo1,Ma Xiaoqing1,Yuan Xiaolei2,Xiang Yong3,Cai Zhao1ORCID

Affiliation:

1. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China

2. School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China

3. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China

Abstract

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.

Funder

National Natural Science Foundation of China

“CUG Scholar” Scientific Research Funds at China University of Geosciences

Central Guidance Local Innovation Base Construction Project, China

Publisher

MDPI AG

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