Details

Autor(en) / Beteiligte

• Zhu, Yin
• Chen, Yanxu
• Feng, Yafei
• Meng, Xiangmin
• Xia, Jing
• Zhang, Genqiang

Titel

Constructing Ru‐O‐TM Bridge in NiFe‐LDH Enables High Current Hydrazine‐assisted H2 Production

Ist Teil von

• Advanced materials (Weinheim), 2024-07, Vol.36 (30), p.e2401694-n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2024

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• Hydrazine 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. The Ru─O─Ni/Fe bridges are constructed by anchoring the Ru cluster on NiFe‐LDH substrate, the broader d‐band width (Wd) and lower d‐band center of Ru atoms have weakened the over‐strong adsorption of intermediates on Ru surface, hence the catalytic property of Ruc/NiFe‐LDH is improved, showing outstanding prospect in practical hydrazine‐assisted H2 generation.