Research Article

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2021, 14(12): 4569–4576

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https://doi.org/10.1007/s12274-021-3375-2

Spontaneous migration induced Co nanokarstcave encapsulated in N-doped carbon hybrids for efficient oxygen electrocatalyst

Xuemin Wang1,2, Ming Liu1,2, Hang Zhang1,2, Sihao Yan1,2, Cui Zhang1,2 (✉), and Shuangxi Liu1,2,3,4 (✉)

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1 School of Materials Science and Engineering, Institute of New Catalytic Materials Science, Nankai University, Tianjin 300350, China
2 National Institute for Advanced Materials, Nankai University, Tianjin 300350, China
3 Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education, Nankai University, Tianjin 300071, China
4 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China

Keywords: size effect, spontaneous migration, Co nanokarstcave, oxygen electrocatalyst, multicomponent synergy
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  • Abstract
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Despite the extensive application of porous nanostructures as oxygen electrocatalysts, it is challenging to synthesize single-metal state materials with porous structures, especially the ultrasmall ones due to the uniform diffusion of the same metal. Herein, we pioneer demonstrate a new size effect-based controllable synthesis strategy for the homogeneous Co nanokarstcaves assisted by Co-CN hybrids (CCHs). The preferential migration of cobalt atoms on the surface of small size zeolitic imidazolate framework (ZIF) with high surface energy during pyrolysis is the key factor for the formation of nanokarstcave structure. Furthermore, graphene can act as a diffusion barrier to prevent the agglomeration of nanoparticles in the synthesis process, which also plays an important role in the formation of porous nanostructures. In alkali media, CCHs achieve overpotential of 287 mV (@10 mA·cm−2) for oxygen evolution reaction (OER) and a half wave potential of 0.86 V (vs. RHE) for oxygen reduction reaction (ORR).
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Spontaneous migration induced Co nanokarstcave encapsulated in N-doped carbon hybrids for efficient oxygen electrocatalyst. Nano Res. 2021, 14(12): 4569–4576 https://doi.org/10.1007/s12274-021-3375-2

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