From rotating disk electrode to single cell: Exploration of PtNi/C octahedral nanocrystal as practical proton exchange membrane fuel cell cathode catalyst
From rotating disk electrode to single cell: Exploration of PtNi/C octahedral nanocrystal as practical proton exchange membrane fuel cell cathode catalyst
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从旋转盘电极到单电池：PtNi/C八面体纳米晶作为实用质子交换膜燃料电池阴极催化剂的探索
DOI：
10.1016/j.jpowsour.2018.10.010
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发表时间：
2018-12-01
影响因子：
9.2
通讯作者：
Zhang, Cunman
中科院分区：
文献类型：
--
作者：
Wang, Jue;Li, Bing;Zhang, Cunman
以十六烷基三甲基溴化铵为结构导向剂，采用表面活性剂辅助溶剂热法制备了PtNi/C八面体催化剂，并通过实验和模拟研究了其在旋转圆盘电极和膜电极上的性能。在0.9 V vs. RHE下，其质量活性和比活性分别是商业Pt/C的约6.1和6.6倍。在阴极中使用PtNi/C八面体催化剂制造的膜电极组件表现出增强的发电性能和耐久性。在1000 mA·cm ~（-2）时，电池电压比对照组提高了34 mV，最大功率密度分别提高了160.2 mW·cm ~（-2）和0.27 kW·g（P）（t）（-1）。经100 h恒电流耐久性试验，其1000 mA cm（-2）时的电池电压衰减率和最大功率密度衰减率分别为6.9%和14.3%（对照组分别为10.9%和18.4%）。模拟结果还表明，PtNi/C八面体催化剂不仅具有较高的半电池性能，而且在单电池中显示出实际应用潜力，这表明通过优化膜电极组件的制备和电池运行条件，可以在单电池中实现PtNi/C八面体催化剂在旋转圆盘电极水平上的优异性能。
PtNi/C octahedral nanocrystal catalyst is prepared through surfactant-assisted solvothermal approach using cetyltrimethylammoniurn bromide as structure directing agent, and its performance on rotating disk electrode and membrane electrode assembly are investigated through experiment and simulation. Its mass activity and specific activity at 0.9 V vs. RHE are about 6.1 and 6.6 times high of commercial Pt/C, respectively. The membrane electrode assembly that is fabricated using PtNi/C octahedral catalyst in cathode exhibits enhanced power generation performance and durability. Its cell voltage at 1000 mA cm(-2) is increased by 34 mV compared with the control, and its maximum power densities are raised by 160.2 mW cm(-2) and 0.27 kW g(P)(t)(-1). After 100 h galvanostatic durability test, the attenuation rates of its cell voltage at 1000 mA cm(-2) and maximum power density are 6.9% and 14.3% (10.9% and 18.4% for the control), respectively. The simulation results also reveal that PtNi/C octahedral catalyst not only has high half cell performance, but also shows actual application potential in single cell, which demonstrates the feasibility that the excellent performance of PtNi/C octahedral catalyst at rotating disk electrode level can be realized in single cells through optimization of membrane electrode assembly fabrication and cell operation conditions.