Sun Xiandi, Cheng Zhiyuan, Liu Hang, Chen Siyu, Zheng Ya-Rong
Anhui Province Key Laboratory of Value-Added Catalytic Conversion and Reaction Engineering, Anhui Province Engineering Research Center of Flexible and Intelligent Materials, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China.
Nanomaterials (Basel). 2024 May 6;14(9):808. doi: 10.3390/nano14090808.
With the rapid development of anion exchange membrane technology and the availability of high-performance non-noble metal cathode catalysts in alkaline media, the commercialization of anion exchange membrane fuel cells has become feasible. Currently, anode materials for alkaline anion-exchange membrane fuel cells still rely on platinum-based catalysts, posing a challenge to the development of efficient low-Pt or Pt-free catalysts. Low-cost ruthenium-based anodes are being considered as alternatives to platinum. However, they still suffer from stability issues and strong oxophilicity. Here, we employ a metal-organic framework compound as a template to construct three-dimensional porous ruthenium-tungsten-zinc nanocages via solvothermal and high-temperature pyrolysis methods. The experimental results demonstrate that this porous ruthenium-tungsten-zinc nanocage with an electrochemical surface area of 116 m g exhibits excellent catalytic activity for hydrogen oxidation reaction in alkali, with a kinetic density 1.82 times and a mass activity 8.18 times higher than that of commercial Pt/C, and a good catalytic stability, showing no obvious degradation of the current density after continuous operation for 10,000 s. These findings suggest that the developed catalyst holds promise for use in alkaline anion-exchange membrane fuel cells.
随着阴离子交换膜技术的快速发展以及高性能非贵金属阴极催化剂在碱性介质中的可得性，阴离子交换膜燃料电池的商业化已变得可行。目前，碱性阴离子交换膜燃料电池的阳极材料仍依赖于铂基催化剂，这对高效低铂或无铂催化剂的开发构成了挑战。低成本的钌基阳极正被视为铂的替代品。然而，它们仍然存在稳定性问题和较强的亲氧性。在此，我们采用一种金属有机框架化合物作为模板，通过溶剂热法和高温热解法构建三维多孔钌 - 钨 - 锌纳米笼。实验结果表明，这种电化学表面积为116 m g的多孔钌 - 钨 - 锌纳米笼在碱性条件下对氢氧化反应表现出优异的催化活性，其动力学密度是商业Pt/C的1.82倍，质量活性是商业Pt/C的8.18倍，并且具有良好的催化稳定性，在连续运行10000 s后电流密度没有明显下降。这些发现表明，所开发的催化剂有望用于碱性阴离子交换膜燃料电池。
