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Challenge: Hydrazine oxidation reaction (HzOR) has emerged as a potential alternative for energy-saving hydrogen production due to its low oxidation potential (-0.33 V vs. RHE). Current HzOR catalysts exhibit insufficient activity and stability at high current densities, making the development of durable bifunctional catalysts with both efficient HER and HzOR performance a key challenge.
Approach: Professor Xiaofeng Lu from Jilin University, Mengxiao Zhong, and Researcher Ying Wang from Changchun Institute of Applied Chemistry, Chinese Academy of Sciences proposed an in-situ reconstruction strategy for RuPdOx hollow nanofibers (HNFs), generating RuO2/Pd heterostructures through electrochemical and chemical reconstruction processes.
Innovation 1: The reconstructed catalyst demonstrated high efficiency in both hydrazine oxidation reaction (HzOR) and hydrogen evolution reaction (HER) at industrial-grade current densities, significantly outperforming benchmark Pt/C catalysts.
Innovation 2: It maintained record-breaking durability for 500 hours under high pressure at 1 A cm−2. When used as electrodes in a two-electrode overall hydrazine splitting (OHzS) cell, the system required only 0.263 kWh of electricity to produce 1 m³ of hydrogen at 100 mA cm−2 current density, far below the 4.286 kWh m−3 H2 required by overall water splitting (OWS) systems, demonstrating exceptional energy-saving hydrogen production characteristics.
Innovation 3: Density functional theory (DFT) calculations revealed that after reconstruction of RuPdOx HNFs, efficient electron transfer occurred at the interface between Pd and RuO2. This process modulated the local electronic environment of atoms, optimized the adsorption-desorption behavior of intermediates, and reduced the energy barrier of electrocatalytic reactions, thereby enhancing catalytic efficiency.
https://doi.org/10.1002/adma.202504922
