Alkaline hydrazine liquid fuel cells (AHFC) have been highlighted in terms of high power performance with non-precious metal catalysts.Although Fe-N-C is a promising non-Pt electrocatalyst for oxygen reduction reaction (ORR),the surface density of the active site is very low and the catalyst layer should be thick to acquire the necessary number of catalytic active sites.With this thick catalyst layer,it is important to have an optimum pore structure for effective reactant conveyance to active sites and an interface structure for faster charge transfer.Herein,we prepare a Fe-N-C catalyst with magnetite parti-cles and hierarchical pore structure by steam activation.The steam activation process significantly improves the power performance of the AHFC as indicated by the lower IR and activation voltage losses.Based on a systematic characterization,we found that hierarchical pore structures improve the catalyst utilization efficiency of the AHFCs,and magnetite nanoparticles act as surface modifiers to reduce the interfacial resistance between the electrode and the ion-exchange membrane.

Sooan Bae;Jihyeon Park;Yuna Hwang;Jin-Soo Park;Jaeyoung Lee;Beomgyun Jeong

Research Center for Materials Analysis,Korea Basic Science Institute,169-148,Gwahak-ro,Daejeon 34133,Republic of Korea;School of Earth Sciences and Environmental Engineering,Gwangju Institute of Science and Technology,123 Cheomdangwagi-ro,Buk-gu,Gwangju 61005,Republic of Korea;Department of Green Chemical Engineering,Sangmyung University,31 Sangmyungdae-gil,Dongnam-gu,Cheonan,Chungnam Province 31066,Republic of Korea;Ertl Center for Electrochemistry and Catalysis,Gwangju Institute of Science and Technology,123 Cheomdangwagi-ro,Buk-gu,Gwangju 61005,Republic of Korea

能源化学

[1]Sooan Bae;Jihyeon Park;Yuna Hwang;Jin-Soo Park;Jaeyoung Lee;Beomgyun Jeong-.Steam activation of Fe-N-C catalyst for advanced power performance of alkaline hydrazine fuel cells)[J].能源化学,2022(01):276-285

AHFC,AHFCs

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