Journal article

Identification of active sites for acidic oxygen reduction on carbon catalysts with and without nitrogen doping

Yi Jia, Longzhou Zhang, Linzhou Zhuang, Hongli Liu, Xuecheng Yan, Xin Wang, Jiandang Liu, Jiancheng Wang, Yarong Zheng, Zhaohui Xiao, Elena Taran, Jun Chen, Dongjiang Yang, Zhonghua Zhu, Shuangyin Wang, Liming Dai, Xiangdong Yao



Owing to the difficulty in controlling the dopant or defect types and their homogeneity in carbon materials, it is still a controversial issue to identify the active sites of carbon-based metal-free catalysts. Here we report a proof-of-concept study on the active-site evaluation for a highly oriented pyrolytic graphite catalyst with specific pentagon carbon defective patterns (D-HOPG). It is demonstrated that specific carbon defect types (an edged pentagon in this work) could be selectively created via controllable nitrogen doping. Work-function analyses coupled with macro and micro-electrochemical performance measurements suggest that the pentagon defects in D-HOPG served as major active si..

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University of Melbourne Researchers


Awarded by Australia Research Council

Awarded by ARC

Funding Acknowledgements

The authors thank the Australia Research Council for financial support (ARC DP170103317, ARC DP170102267 and ARC DP190103881). Y.J. also thanks the ARC for an ARC Discovery Early Career Researcher Award (ARC DE180101030). The authors thank the Australian National Fabrication Facility (ANFF)-Materials Node, the University of Wollongong Electron Microscopy Centre and Canadian Light Source for equipment access.