Citation: Xiao Yao, Pei Yu, Hu Yifan, Ma Ruguang, Wang Deyi, Wang Jiacheng. Co₂P@P-Doped 3D Porous Carbon for Bifunctional Oxygen Electrocatalysis[J]. Acta Physico-Chimica Sinica, ;2021, 37(7): 200905. doi: 10.3866/PKU.WHXB202009051 shu

Co₂P@P-Doped 3D Porous Carbon for Bifunctional Oxygen Electrocatalysis

Xiao Yao ^1,2 ,
Pei Yu ² ,
Hu Yifan ² ,
Ma Ruguang ² ,
Wang Deyi ^1,, ,
Wang Jiacheng ^2,,

1.
School of Science, Xihua University, Chengdu 610039, China
1.
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Corresponding author: Wang Deyi, deyi.wang@imdea.org Wang Jiacheng, jiacheng.wang@mail.sic.ac.cn
Received Date: 15 September 2020
Revised Date: 12 October 2020
Accepted Date: 16 November 2020
Available Online: 20 November 2020
Fund Project: This research is financially supported by the Program of Shanghai Academic Research Leader (20XD1424300) for financial supportthe Program of Shanghai Academic Research Leader 20XD1424300

The existing energy and environmental issues are the primary issues that restrict the continual development of the mankind. Cost-effective energy storage and conversion devices have attracted significant attention. Rechargeable zinc-air batteries (ZABs) are widely studied because they are portable, possess high power density, and are environmentally friendly. However, the slow kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) limit their practical application. It is crucial to develop dual-functional electrocatalysts with excellent electrocatalytic performance, low price, simple operation, and outstanding stability. Therefore, transition metals and carbon-based materials should be combined. Although Co₂P has been widely reported as an efficient OER catalyst, there are few studies based on the ORR activity. Herein, a facile pyrolysis of cobalt salt, phytic acid, and k-carrageenan aerogel was carried out on Co₂P nanoparticles within P-doped porous carbon (Co₂P-PCA-800), showing enhanced ORR activity. The resulting composite (Co₂P-PCA-800) with a three-dimensional (3D) hierarchical porous architecture exhibited outstanding ORR activity with a high half-wave potential (E_1/2) of approximately 0.84 V, which is comparable to that of Pt/C. Simultaneously, we fabricated phosphorus-doped porous carbon (PCA) and cobalt-doped porous carbon (Co-CA) to compare the effect of structural morphology on the catalytic performance. Studies have found that a regular interconnected porous structure can be beneficial for mass transfer and can ensure uniform distribution of ion current, thereby resulting in increased number of effective active sites. The outstanding ORR activity mainly results from the synergistic effect of the 3D honeycomb hierarchical porous structure and positively charged Co₂P nanoparticles encapsulated in P-doped carbon. In addition, the 3D honeycomb porous carbon structure not only facilitates mass transfer and accelerates electron transfer but also protects the cobalt phosphide. Finally, we assembled a rechargeable ZAB with Co₂P-PCA-800 as the air cathode catalyst. Compared with precious metal catalysts, the catalyst has considerable charge-discharge performance and energy density as well as higher specific capacity and better cycle stability. We believe that this study will provide a significant direction for solving energy and environmental issues.
- Co₂P nanoparticles,
- 3D porous carbon,
- Electrocatalysis,
- Oxygen reduction reaction,
- Zn-air battery
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沈阳化工大学材料科学与工程学院沈阳 110142

Co2P@P-Doped 3D Porous Carbon for Bifunctional Oxygen Electrocatalysis

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Co₂P@P-Doped 3D Porous Carbon for Bifunctional Oxygen Electrocatalysis