1. Oxygen vacancy-rich N-doped carbon encapsulated BiOCl-CNTs heterostructures as robust electrocatalyst synergistically promote oxygen reduction and Zn-air batteries
- Author
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Xue Shao, Shuqing Zhou, Tayirjan Taylor Isimjan, Yuting Yang, Yi Liu, Xiulin Yang, and Puxuan Yan
- Subjects
Materials science ,Doping ,Limiting current ,chemistry.chemical_element ,Electrocatalyst ,Oxygen ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Catalysis ,Biomaterials ,Colloid and Surface Chemistry ,chemistry ,Methanol poisoning ,Chemical engineering ,Carbon ,Power density - Abstract
The development of non-precious metal catalysts for oxygen reduction reactions (ORR) is vital for promising clean energy technologies such as fuel cells, and zinc-air batteries. Herein, we present a stepwise synthesis of N-doped and carbon encapsulated BiOCl-CNTs heterostructures. Electrocatalytic ORR studies show that the optimized catalyst has a high half-wave potential (E1/2) of 0.85 V (vs. RHE), large limiting current density (-5.34 mA cm−2@0.6 V) in alkaline medium, and nearly perfect 4e− reduction characteristics, even surpassing commercial Pt/C. Meanwhile, the catalyst has exceptional durability (above 97.5 % after 40000 s) and strong resistance towards methanol poisoning. The good ORR activity also results in high-performance zinc-air batteries with a specific capacity (724 mAh g−1@10 mA cm−2), a high open-circuit potential of 1.51 V and a peak power density of 170.7 mW cm−2, as well as an ultra-long charge–discharge cycle stability (155 h), comparable with the Pt/C catalyst. The catalytic mechanism reveals that the excellent electrocatalytic performance originates from the synergistic effect of N doping, oxygen vacancies, and BiOCl sites.
- Published
- 2022