In situ conversion of iron sulfide (FeS) to iron oxyhydroxide (γ-FeOOH) on N, S co-doped porous carbon nanosheets: An efficient electrocatalyst for the oxygen reduction reaction and zinc-air batteries

Nan Jia; Jing Liu; Yanping Liu; Lei Wang; Pei Chen; Zhongwei An; Xinbing Chen; Yu Chen

doi:10.1016/j.jcis.2019.09.083

In situ conversion of iron sulfide (FeS) to iron oxyhydroxide (γ-FeOOH) on N, S co-doped porous carbon nanosheets: An efficient electrocatalyst for the oxygen reduction reaction and zinc-air batteries

J Colloid Interface Sci. 2020 Jan 15:558:323-333. doi: 10.1016/j.jcis.2019.09.083. Epub 2019 Sep 23.

Authors

Nan Jia¹, Jing Liu¹, Yanping Liu¹, Lei Wang¹, Pei Chen², Zhongwei An¹, Xinbing Chen³, Yu Chen¹

Affiliations

¹ Key Laboratory of Applied Surface and Colloid Chemistry (MOE), Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, PR China.
² Key Laboratory of Applied Surface and Colloid Chemistry (MOE), Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, PR China. Electronic address: chenpei@snnu.edu.cn.
³ Key Laboratory of Applied Surface and Colloid Chemistry (MOE), Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, PR China. Electronic address: chenxinbing@snnu.edu.cn.

PMID: 31605934
DOI: 10.1016/j.jcis.2019.09.083

Abstract

For the development of metal-air batteries and fuel cells, highly efficient and inexpensive electrocatalysts are one of the main issues for scalable applications of these advanced energy devices. Herein, based on the in situ conversion of FeS to γ-FeOOH with a two-dimensional (2D) layered structure, a special nanohybrid, N, S co-doped porous carbon nanosheets loaded with γ-FeOOH, is fabricated by carbonization of Fe³⁺-coordinated polydopamine, which uniformly coats the surface of bacterial cellulose. The nanocomposites exhibit high activity towards the cathodic oxygen reduction reaction (ORR), characterized by a more positive half-wave potential (10 mV) than the commercial Pt/C (20 wt%) electrocatalyst in alkaline medium. Additionally, the nanohybrid has excellent stability and a high methanol tolerance towards the ORR. Further experiments and density functional theory (DFT) calculations demonstrate that the doped N, S in the carbon matrix and the (0 1 0) plane of γ-FeOOH are the ORR active sites. A zinc-air battery equipped with this nanohybrid presents better a power density (92 mW cm^-2) and specific capacity (740 mA h g^-1) than the Pt/C electrocatalyst, demonstrating its promising potential for application in energy conversion devices.

Keywords: Electrocatalysis; N; Oxygen reduction reaction; S co-doped carbon nanosheets; Zinc–air battery; γ-FeOOH.