Direct methylhydrazine fuel cell enabled by a three-dimensional hierarchical Pd-Ni(OH)2/NF anode

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources Pub Date : 2025-09-28 DOI:10.1016/j.jpowsour.2025.238369

Wenxing Jiang , Qiqi Wan , Endao Zhang , Yingying Liu , Junbo Hou , Min Yang , Xiaodong Zhuang , Changchun Ke

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Abstract

This study presents a novel direct methylhydrazine fuel cell (DMHFC) utilizing a hydrothermally synthesized Pd-Ni(OH)₂ composite catalyst supported on nickel foam (Pd-Ni(OH)₂/NF) as the anode. The Pd-Ni(OH)₂/NF features a three-dimensional hierarchical architecture with dispersed Pd nanoparticles (0.08 mg cm⁻²) chemically anchored via Pd-O-Ni bonds in the Ni(OH)₂ nanosheet matrix, as confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) analyses. The electrode demonstrates superior electrocatalytic activity for the methylhydrazine oxidation reaction (MHOR), attributed to enhanced active site accessibility, charge transfer efficiency, and optimized mass transport. Differential electrochemical mass spectrometry (DEMS) reveals complete oxidation of hydrazine fragments to N₂ with suppressed NH₃ byproduct formation relative to Pd/C. Systematic optimization of operating conditions yields a peak power density of 30.5 mW cm⁻² (oxygen as the oxidant, 80 °C) and 110 mW cm⁻² (hydrogen peroxide as the oxidant, 80 °C), with performance trade-offs observed between reaction kinetics and fuel crossover. This work validates the feasibility of DMHFC technology, highlighting the potential of methylhydrazine as a high-energy-density fuel for portable systems, while providing insights into electrode design and performance optimization for advanced energy conversion devices.

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三维分层Pd-Ni(OH)2/NF阳极实现直接甲基肼燃料电池

研究了一种新型的直接甲基肼燃料电池（DMHFC），该电池采用水热合成的Pd-Ni(OH)2复合催化剂（Pd-Ni(OH)2/NF）作为阳极负载泡沫镍。通过x射线衍射（XRD）、x射线光电子能谱（XPS）和扫描电子显微镜与能量色散x射线能谱（SEM-EDS）分析证实，Pd-Ni(OH)2/NF具有三维分层结构，分散的Pd纳米颗粒（0.08 mg cm - 2）通过Pd- o -Ni键在Ni(OH)2纳米片基体中化学固定。该电极在甲基肼氧化反应（MHOR）中表现出优异的电催化活性，这归功于活性位点的可及性、电荷转移效率和优化的质量传递。差分电化学质谱分析（dms）显示，相对于Pd/C，肼片段完全氧化为N2， NH3副产物的生成受到抑制。系统优化的操作条件产生的峰值功率密度为30.5 mW cm - 2（氧作为氧化剂，80°C）和110 mW cm - 2（过氧化氢作为氧化剂，80°C），在反应动力学和燃料交叉之间观察到性能折衷。这项工作验证了DMHFC技术的可行性，突出了甲基肼作为便携式系统高能量密度燃料的潜力，同时为先进能量转换设备的电极设计和性能优化提供了见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Power Sources 工程技术-电化学

CiteScore

16.40

自引率

6.50%

发文量

1249

审稿时长

36 days

期刊介绍： The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells. Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include: • Portable electronics • Electric and Hybrid Electric Vehicles • Uninterruptible Power Supply (UPS) systems • Storage of renewable energy • Satellites and deep space probes • Boats and ships, drones and aircrafts • Wearable energy storage systems