講演情報
[P087C [発表前半]]Ni–Mo/N-Doped Graphitic Carbon Electrocatalyst for Energy-Efficient Hydrazine-Assisted Seawater Electrolysis
○Rajathsing Kalusulingam1, Krishnan Ravi, Martin Muhler, Shim Jun Ho, Sasaki Keiko (1. Waseda University)
キーワード：
Ni–Mo bimetallic electrocatalyst、N-doped graphitic carbon、Hydrazine oxidation reaction、Seawater electrolysis、Hydrogen generation
Hydrazine-assisted electrolysis provides an energy-efficient route for hydrogen production by replacing the kinetically sluggish oxygen evolution reaction and suppressing chloride-induced side reactions in seawater electrolytes. Herein, we report a bimetallic Ni–Mo incorporated N-doped graphitic carbon (NiMo@NGC) electrocatalyst as a non-noble platform for hydrogen evolution coupled with hydrazine oxidation in alkaline seawater media. Hydrazine is employed as a model anodic reactant to probe charge-transfer-dominated kinetics. Operando electrochemical impedance spectroscopy reveals a potential-dependent transition from capacitive behavior to charge-transfer-controlled processes, driven by synergistic Ni–Mo interactions within the conductive N-doped carbon matrix. Consequently, NiMo@NGC exhibits low charge-transfer resistance, high Faradaic efficiency, and excellent catalytic stability under alkaline and seawater conditions. A symmetric NiMo@NGC||NiMo@NGC electrolyzer achieves an ultralow cell voltage of 0.45 V and maintains stable operation over extended durations. Post-electrolysis analyses confirm preserved structural integrity with mild surface redox reconstruction, consistent with operando observations. This work provides mechanistic insight into interfacial charge-transfer processes and demonstrates a promising strategy for low-energy, seawater-tolerant hydrogen production