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author:

Hao Wang (Hao Wang.) [1] | Caixia Zheng (Caixia Zheng.) [2] | Bing Huang (Bing Huang.) [3] | Nannan Jiang (Nannan Jiang.) [4] | Yaoxin Li (Yaoxin Li.) [5] | Minghao Wang (Minghao Wang.) [6] | Qirui Wu (Qirui Wu.) [7] | Huiying Wang (Huiying Wang.) [8] | Lunhui Guan (Lunhui Guan.) [9]

Abstract:

Extensive investigations have been devoted to nitrogen-doped carbon materials as catalysts for the oxygen reduction reaction (ORR) in various conversion technologies. In this study, we introduce nitrogen-doped carbon materials with hollow spherical structures. These materials demonstrate significant potential in ORR activity within alkaline media, showing a half-wave potential of 0.87 V versus the reversible hydrogen electrode (RHE). Nitrogen-doped hollow carbon spheres (N-CHS) exhibit unique characteristics such as a thin carbon shell layer, hollow structure, large surface area, and distinct pore features. These features collectively create an optimal environment for facilitating the diffusion of reactants, thereby enhancing the exposure of active sites and improving catalytic performance. Building upon the promising qualities of N-CHS as a catalyst support, we employ heme chloride (1 wt%) as the source of iron for Fe doping. Through the carbonization process, Fe-N active sites are effectively formed, displaying a half-wave potential of 0.9 V versus RHE. Notably, when implemented as a cathode catalyst in zinc-air batteries, this catalyst exhibits an impressive power density of 162.6 mW cm−2.

Keyword:

energy conversion hollow structure nitrogen-doped carbon catalyst oxygen reduction reaction

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Source :

Nanotechnology

ISSN: 0957-4484

Year: 2023

Issue: 48

Volume: 34

2 . 9

JCR@2023

2 . 9 0 0

JCR@2023

JCR Journal Grade:2

CAS Journal Grade:4

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ESI Highly Cited Papers on the List: 0 Unfold All

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Chinese Cited Count:

30 Days PV: 1

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