Affiliation:
1. Hefei National Research Center for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering University of Science and Technology of China Hefei Anhui 230026 P. R. China
2. Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Science Beijing 100190 China
Abstract
AbstractHydrazine oxidation‐assisted water splitting is a critical technology to tackle the high energy consumption in large‐scale H2 production. Ru‐based electrocatalysts hold promise for synergetic hydrogen reduction (HER) and hydrazine oxidation (HzOR) catalysis but are hindered by excessive superficial adsorption of reactant intermediate. Herein, this work designs Ru cluster anchoring on NiFe‐LDH (denoted as Ruc/NiFe‐LDH), which effectively enhances the intermediate adsorption capacity of Ru by constructing Ru─O─Ni/Fe bridges. Notably, it achieves an industrial current density of 1 A cm−2 at an unprecedentedly low voltage of 0.43 V, saving 3.94 kWh m−3H2 in energy, and exhibits remarkable stability over 120 h at a high current density of 5 A cm−2. Advanced characterizations and theoretical calculation reveal that the presence of Ru─O─Ni/Fe bridges widens the d‐band width (Wd) of the Ru cluster, leading to a lower d‐band center and higher electron occupation on antibonding orbitals, thereby facilitating moderate adsorption energy and enhanced catalytic activity of Ru.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Cited by
6 articles.
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