Li Lin, Shen Shuiyun, Wei Guanghua, Li Xiaolin, Yang Kun, Feng Qi, Zhang Junliang
Advanced Technology Department , SAIC Motor Corporation Limited , Shanghai 201804 , China.
ACS Appl Mater Interfaces. 2019 Apr 17;11(15):14126-14135. doi: 10.1021/acsami.8b22494. Epub 2019 Apr 11.
There remain great challenges in exploring cost-effective and highly efficient non-noble metal electrocatalysts to catalyze the oxygen reduction reaction (ORR) of proton exchange membrane fuel cells (PEMFCs). Also, a further validation on their performances under a fuel cell operating condition draws sustained attention. Herein, we report a comprehensive investigation on the ORR performances of a series of pyrolyzed Fe-N-C composites that use phenanthrolene as the nitrogen precursor, and the effects of carbon supports, transition metal precursors, and annealing temperatures are examined in detail. Electrochemical measurements combined with different physicochemical characterizations are employed to clarify the function of critical structures including the specific surface area, microstructure, nitrogen content, nitrogen type, and corresponding proportion on their ORR and fuel cell performances. It demonstrates a half-wave potential of 0.79 V and almost a four-electron pathway. When using the as-optimized Fe-N-C composite as the cathode catalyst of a PEMFC, the maximum power density reaches as high as 540 mW cm.
在探索具有成本效益且高效的非贵金属电催化剂以催化质子交换膜燃料电池（PEMFC）的氧还原反应（ORR）方面，仍然存在巨大挑战。此外，对其在燃料电池运行条件下性能的进一步验证也一直备受关注。在此，我们报告了一系列以菲咯啉作为氮前驱体的热解Fe-N-C复合材料的ORR性能的综合研究，并详细考察了碳载体、过渡金属前驱体和退火温度的影响。采用电化学测量结合不同的物理化学表征来阐明关键结构的作用，包括比表面积、微观结构、氮含量、氮类型及其相应比例对其ORR和燃料电池性能的影响。其半波电位为0.79 V，且几乎是四电子途径。当使用优化后的Fe-N-C复合材料作为PEMFC的阴极催化剂时，最大功率密度高达540 mW/cm²。
