碳载鈷吡啶用于碱性燃料电池非铂基阴极催化剂
arbon-supported Co-pyridine as non-platinum cathode catalyst for alkaline membrane fuel cells
开发具有高性能、低成本的催化剂是聚合物电解质膜燃料电池和直接甲醇燃料电池的中心研究课题。本工作中，我们以碳黑（Vulcan XC-72R）为载体，以吡啶（Py）和硫酸钴水合物(CoSO4o7H2O)作为催化剂前躯体，经溶剂分散，800℃高温处理成功制备了高效氧还原复合催化剂（CoPy/C）。由于碱性介质较酸性介质更有利于催化材料的氧还原动力学，本文运用循环伏安法（CV）和旋转圆盘电极（RDE）技术研究了不同碱性浓度下（KOH，0.05-12M）CoPy/C对氧还原反应（ORR）的电催化性能。Koutechy-Levich方程分析表明：在0.05-6.0 M KOH溶液中，氧气具有高选择性的4e-还原过程。特别是CoPy/C催化剂比商用40%Pt/C催化剂显现出优异的抗甲醇毒性和更高的耐浓碱特性，从而有望在碱性聚合物膜燃料电池得到应用。
In this work, carbon-supported pyridine-cobalt nanoparticles (CoPy/C) are synthesized using cobalt sulfate heptahydrate (CoSO4 7H2O) and pyridine (Py) as the Co and N precursors via a solid state reaction by heat-treatment in an inert atmosphere at 800oC. In particular, the ORR kinetics on these catalyst materials are evaluated using cyclic voltammetry (CV) and rotating disk electrode (RDE) in electrolytes of various KOH concentrations, ranging from 0.05 to 12.0 M, because ORR is more favourable in alkaline electrolytes than in acidic and neutral electrolytes. The Koutecky-Levich equation analysis indicates that oxygen can be reduced to OH- with high selectivity through a direct four-electron pathway mechanism in KOH concentrations in the range of 0.05 - 6.0 M. These catalysts exhibit the superior methanol tolerance to commercial 40%Pt/C catalyst, and the negative effect of higher concentration of KOH is much less for CoPy/C than for Pt/C, suggesting the promising utilization of CoPy/C catalysts as electrocatalysts for alkaline polymer electrolyte membrane fuel cells.
刘师尧、徐莉、田丙伦、周学俊、乔锦丽
电化学工业燃料化学工业
碳载钴吡啶氧还原KOH浓度效应抗甲醇聚合物电解质膜燃料电池?????
o-Pyridine/C catalystOxygen reduction reactionKOH concentration effectmethanol tolerancepolymer electrolyte membrane fuel cell
刘师尧,徐莉,田丙伦,周学俊,乔锦丽.碳载鈷吡啶用于碱性燃料电池非铂基阴极催化剂[EB/OL].(2013-01-25)[2025-08-23].http://www.paper.edu.cn/releasepaper/content/201301-1054.点此复制
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