High performance octahedral PtNi/C catalysts investigated from rotating disk electrode to membrane electrode assembly
High performance octahedral PtNi/C catalysts investigated from rotating disk electrode to membrane electrode assembly
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从旋转盘电极到膜电极组件研究高性能八面体 PtNi/C 催化剂
DOI：
10.1007/s12274-018-2211-9
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发表时间：
2019-02-01
期刊：
影响因子：
9.9
通讯作者：
Zhang, Cunman
中科院分区：
文献类型：
--
作者：
Li, Bing;Wang, Jue;Zhang, Cunman
八面体PtNi/C催化剂在氧还原反应（ORR）中的催化性能优于商业Pt/C旋转圆盘电极（RDE）。然而，将这些有希望的结果转化为现实世界的膜电极组装（MEA）并非易事。本研究以聚二烯基二甲基氯化铵（PDDA）为封盖剂合成了八面体PtNi/C催化剂，并研究了其从RDE到MEA的性能。在RDE中，优化后的八面体PtNi/C氧还原反应（ORR）催化剂的质量活性和比活性分别是目前最先进的商用Pt/C的19倍和28倍。在MEA水平上，八面体PtNi/C催化剂与商用Pt/C阳极配对，表现出优异的发电性能和耐久性。在1000 mA·cm−2的恒流条件下，电池电压达到0.712 V，最大功率密度为881.6 mW·cm−2，电池性能衰减较小，在1000 mA·cm−2的恒流条件下，电池性能衰减约为11.8%和7%。热力学分析和基本性能建模表明，减小PtNi/C催化剂团聚体的尺寸可以进一步提高电池性能。这些令人鼓舞的结果证明了将八面体PtNi/C的优越性能从RDE传递到MEA的可行性。
Octahedral PtNi/C catalysts have demonstrated superior catalytic performance in oxygen reduction reaction (ORR) over commercial Pt/C with rotating disk electrode (RDE). However, it is not trivial to translate such promising results to real-world membrane-electrode assembly (MEA). In this work, we have synthesized octahedral PtNi/C catalysts using poly(diallyldimethylammonium chloride) (PDDA) as a capping agent and investigated their performance from RDE to MEA. In RDE, mass activity and specific activity of the optimized octahedral PtNi/C catalyst for oxygen reduction reaction (ORR) are nearly 19 and 28 times high of the state-of-the-art commercial Pt/C, respectively. At MEA level, the octahedral PtNi/C catalyst exhibits excellent power generation performance and durability paired with commercial Pt/C anode. Its cell voltage at 1,000 mA·cm−2reaches 0.712 V, and maximum power density is 881.6 mW·cm−2and its performance attenuation is also less, around 11.8% and 7% under galvanostatic condition of 1,000 mA·cm−2for 100 h. Such results are investiaged by thermodynamic analysis and fundametal performance modeling, which indicate the single cell performance can be further improved by reducing the size of PtNi/C catalyst agglomerates. Such encouraging results have demonstrated the feasibility to convey the superior performance of octahedral PtNi/C from RDE to MEA.