Electronic structure engineering to boost oxygen reduction activity by controlling the coordination of the central metal

• Main Authors: Han, Yunhu, Wang, Yanggang, Xu, Ruirui, Chen, Wenxing, Zheng, Lirong, Han, Aijuan, Zhu, Youqi, Zhang, Jian, Zhang, Huabin, Luo, Jun, Chen, Chen, Peng, Qing, Wang, Dingsheng, Li, Yadong
• Other Authors: School of Chemical and Biomedical Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Chemical engineering; Chlorine; Electrocatalysts
• Online Access: https://hdl.handle.net/10356/144573
• Institution: Nanyang Technological University

Adjusting the electronic structure of the active center is a highly effective strategy for improving the performance of catalysts. Herein, we report an atomically dispersed catalyst (FeCl1N4/CNS), which realized for the first time a great improvement of the ORR by controlling the electronic structure of the central metal with a coordinated chlorine. The half-wave potential of FeCl1N4/CNS is E1/2 = 0.921 V, which is the highest among the reported values for non-precious metal electrocatalysts and far exceeds that of FeN4/CN and commercial Pt/C in alkaline solution. Besides an exceptionally high kinetic current density (Jk) of 41.11 mA cm−2 at 0.85 V, it also has a good methanol tolerance and outstanding stability. Experiments and DFT demonstrated that the near-range interaction with chlorine and the long-range interaction with sulfur of Fe modulated the electronic structure of the active site, thus resulting in a great improvement of the ORR in alkaline media. The present findings could open new avenues for the design of superior electrocatalysts.