Volume 8 Issue 1
Feb.  2023
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Article Navigation >  Green Energy&Environment  > 2023  >  8(1): 308-317
Jingsha Li, Shijie Yi, Ranjusha Rajagopalan, Zejie Zhang, Yougen Tang, Haiyan Wang. Micropores regulating enables advanced carbon sphere catalyst for Zn-air batteries. Green Energy&Environment, 2023, 8(1): 308-317. doi: 10.1016/j.gee.2021.03.003
Citation: Jingsha Li, Shijie Yi, Ranjusha Rajagopalan, Zejie Zhang, Yougen Tang, Haiyan Wang. Micropores regulating enables advanced carbon sphere catalyst for Zn-air batteries. Green Energy&Environment, 2023, 8(1): 308-317. doi: 10.1016/j.gee.2021.03.003
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Micropores regulating enables advanced carbon sphere catalyst for Zn-air batteries

doi: 10.1016/j.gee.2021.03.003

  • a. Hunan Provincial Key Laboratory of Chemical Power Sources, Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China;

  • b. Institute of Materials Science and Devices, Suzhou University of Science and Technology, Suzhou, 215011, China

Funds:

D Program of China (No. 2018YFB0104000 and No. 2019YFA0210300), National Nature Science Foundation of China (No.21571189 and No.21671200), Natural Science Foundation of Jiangsu Province (BK20200991), Hunan Provincial Science and Technology Plan Project of China (No. 2019GK2033, No. 2017TP1001, CPS2019K06 and No. 2018RS3009). The authors would also be grateful to Postdoctoral International Exchange Program Funding of China (No. [2018]115) and China Postdoctoral Science Foundation (2019M652802).

This research was financially supported by the National Key R&

  • Received date 29 December 2020, Accepted date 04 March 2021, RevRecd date 02 March 2021, Publish date 05 March 2021,
    Abstract
  • Energy conversion technologies like fuel cells and metal-air batteries require oxygen reduction reaction (ORR) electrocatalysts with low cost and high catalytic activity. Herein, N-doped carbon spheres (N-CS) with rich micropore structure have been synthesized by a facile two-step method, which includes the polymerization of pyrrole and formaldehyde and followed by a facile pyrolysis process. During the preparation, zinc chloride (ZnCl2) was utilized as a catalyst to promote polymerization and provide a hypersaline environment. In addition, the morphology, defect content and activity area of the resultant N-CS catalysts could be regulated by controlling the content of ZnCl2. The optimum N-CS-1 catalyst demonstrated much better catalytic activity and durability towards ORR in alkaline conditions than commercial 20 wt% Pt/C catalysts, of which the half-wave potential reached 0.844 V vs. RHE. When applied in the Zn-air batteries as cathode catalysts, N-CS-1 showed a maximum power density of 175 mW cm-2 and long-term discharging stability of over 150 h at 10 mA cm-2, which outperformed 20 wt% Pt/C. The excellent performance could be due to its ultrahigh specific surface area of 1757 m2 g-1 and rich micropore channels structure. Meanwhile, this work provides an efficient method to synthesize an ultrahigh surface porous carbon material, especially for catalyst application.

     

    • • The N-doped carbon spheres (N-CS) with abundant micropores and defects were prepared by a facile polymerization of pyrrole and formaldehyde and following pyrolysis. • Hypersaline environment of ZnCl2 was found to change the morphology, porosity structure and defects of N-CS and further improve its ORR performance. • N-CS exhibited excellent performance towards ORR in Zn-air battery, due to its ultrahigh specific surface area and rich micropore structure..
    Jingsha Li and Shijie Yi contributed equally.
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