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Title: Enhancing bifunctionality of CoN nanowires by Mn doping for long-lasting Zn-air batteries
Authors: Zhang, Yongqi
Ouyang, Bo
Long, Guankui
Tan, Hua
Wang, Zhe
Zhang, Zheng
Gao, Weibo
Rawat, Rajdeep Singh
Fan, Hong Jin
Keywords: Engineering::Materials
Issue Date: 2020
Source: Zhang, Y., Ouyang, B., Long, G., Tan, H., Wang, Z., Zhang, Z., ... Fan, H. J. (2020). Enhancing bifunctionality of CoN nanowires by Mn doping for long-lasting Zn-air batteries. Science China Chemistry. doi:10.1007/s11426-020-9739-2
Journal: Science China Chemistry
Abstract: Tailoring the nanostructure and composition of transition metal nitrides is highly important for their use as potent low-cost electrocatalysts. Cobalt nitride (CoN) exhibits strong catalytic activity for oxygen evolution reaction (OER). However, its poor catalytic efficiency for oxygen reduction reaction (ORR) hinders its application in rechargeable zinc-air batteries (ZABs) as the air cathode. In this work, we deploy the effective strategy of Mn doping to improve both OER and ORR activity of CoN nanowires as the cathode material for ZAB. Theoretical calculation predicts that moderate Mn doping in cobalt nitride results in a downshift of the d-band center and reduces the adsorption energy of reaction intermediates. With ~10 at% Mn dopants, stronger catalysis activities for both OER and ORR are achieved compared to pure CoN nanowires. Subsequently, both aqueous and flexible quasi-solid-state ZABs are constructed using the Mn-doped CoN nanowires array as additive-free air cathode. Both types of devices present large open circuit potential, high power density and long-cycle stability. This work pushes forward the progress in developing cost-effective ZABs.
ISSN: 0021-843X
DOI: 10.1007/s11426-020-9739-2
DOI (Related Dataset): 10.21979/N9/7STU9Y
Schools: School of Physical and Mathematical Sciences 
Rights: © 2020 Science in China Press. All rights reserved. This paper was published in Science China Chemistry and is made available with permission of Science in China Press. The original publication is available at and
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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