Journal
CHEMICAL ENGINEERING JOURNAL
Volume 439, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135700
Keywords
Sb-N-C catalyst; Micro; meso -pores; Electrocatalytic activity; Mass transport; Zn-air battery
Categories
Funding
- National Natural Science Foundation of China [21902084]
- Natural Science Foundation of Hubei Province [2020CFB677]
- Foundation of Guangxi Key Laboratory of Optical and Electronic Materials and Devices [20KF-8]
- 111 Project [D20015]
- CTGU
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A series of atomically dispersed Sb-N-C catalysts were successfully synthesized by an adsorption-pyrolysis strategy, demonstrating outstanding ORR activity and efficient mass transport.
Main-group metal based single-atom catalysts are attracting increasing research attention in electrochemical catalysis owing to their partially occupied valence p-orbitals. Herein, we report a series of atomically dispersed Sb-N-C catalysts (including Sb-N-C-NP, Sb-N-C-NL and Sb-N-C-NT) synthesized by a facile adsorption-pyrolysis strategy for oxygen reduction reaction (ORR). Apart from generating atomically dispersed Sb-N-5 sites as active centers, self-evaporation of Sb during pyrolysis process has created abundant micro/meso-pores in Sb-N-C catalysts. Benefitting from these advantageous features, Sb-N-C presents outstanding ORR activity (Sb-N-5 sites) and efficient mass transport (micro/meso-pores). By rotating disk electrode (RDE) test in alkaline media, Sb-N-C exhibits a most positive half-wave potential of 0.90 V vs. RHE and a highest kinetic current density up to 43.8 mA cm(-2) at 0.85 V vs. RHE. As gas diffusion electrode (GDE), Sb-N-C-NP0.2 demonstrates fast O-2 diffusion and transport that enables smaller mass transport overpotential at high current densities up to 800 mA cm(-2). Finally, Zn-air battery that uses the Sb-N-CNP catalyst as air electrode achieves a maximum power density of 180 mW cm(-2) and more than 1000 hs of continuous operation. This work further demonstrates the excellent performance of main-group Sb single-atom catalyst toward ORR and applications in practical energy conversion devices.
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