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An universal in-situ phosphating strategy to fabricate high-performance Co2P-based bifunctional oxygen electrocatalyst derived from conjugated polyaniline-phytic acid copolymer

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Abstract

Electrocatalysts play a crucial role in the performance of rechargeable Zn-air batteries (ZABs), but it is still difficult to produce nonprecious materials with excellent bifunctional oxygen reduction reactions (ORR) and oxygen evolution reactions (OER). Herein, conjugated polyaniline-phytic acid polymer (pANI-PA) was directly calcined to fabricate Co2P nanoparticles embedded in N, P-doped carbon network composites (Co2P@pDC-PA) for metal-air cathodes. The resulting pANI-PA derived Co2P-based carbon composite exhibits exceptional bifunctional ORR/OER activities with a half-wave potential of 0.79 V for ORR and 1.62 V of over-potential for OER at 10 mA·cm−2. Owing to the synergistic effect of its unique three-dimensional (3D) structure, N, P-doped carbon framework, and encapsulated Co2P nanoparticles, as-fabricated composite can be used as a highly efficient air cathode in the rechargeable metal-air battery. The assembled rechargeable ZAB demonstrates a high-power density of 190.0 mW·cm−2 and remarkable cycling stability over 1000 h. This study introduced a novel approach that paves the way for the efficient, cost-effective, and scalable production of bifunctional electrocatalysts for rechargeable ZABs.

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摘要

具有双功能氧还原(ORR)/氧析出(OER)的电催化剂对二次锌-空气电池(ZABs)的性能起着至关重要的作用。因此，开发成本低廉、性能优异的双功能ORR/OER活性电催化材料引起了学者广泛的关注。本文以共轭聚苯胺-植酸聚合物（pANI-PA）锚定金属钴离子，直接煅烧制备了N, P共掺杂碳负载Co2P纳米颗粒复合材料(Co2P@pDC-PA)，所制备的pANI-PA衍生碳基Co2P复合材料表现出优异的双功能ORR/OER活性，ORR的半波电位为0.79 V，在10 mA‧cm-2下，OER的过电位为1.62 V。所制备复合材料维持了共轭聚苯胺-植酸聚合物的三维结构，衍生碳材料将Co2P纳米颗粒封装，形成了碳包覆结构。所制备的pANI-PA衍生Co2P基碳复合材料展现出优异的ORR/OER双功能活性和循环稳定性，以其作为二次锌-空气电池空气阴极活性组分展现出了190.0 mW‧cm-2的高功率密度和超长的充放电稳定性（超过1000 h）。本研究提供了一种新方法，为高效、经济、可规模化生产二次锌-空气电池电极材料提供了可行方案。

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Acknowledgements

This work was financially supported by Hubei Provincial Natural Science Foundation and Huangshi of China (No. 2022CFD039), the National Natural Science Foundation of China (Nos. 22075072, 52202284 and 52301272), the College Students Innovation and Entrepreneurship Training Program of China (Nos. D202305271035223001, D202305271407085899 and D202305272109110950), Zhejiang Provincial Natural Science Foundation (No. LQ23E020002), Wenzhou Key Scientific and Technological Innovation Research Projects (No. ZG2023053), Wenzhou Natural Science Foundation (Nos. ZG2022032, G20220019 and G20220021), the Cooperation between Industry and Education Project of Ministry of Education (No. 220601318235513), the State Key Laboratory of Electrical Insulation and Power Equipment, **’an Jiaotong University (No. EIPE22208) and the Doctoral Innovation Foundation of Wenzhou University (No. 3162023001001).

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  1. Hubei Key Laboratory of Photoelectric Materials and Devices, School of Material Science and Engineering, Hubei Normal University, Huangshi, 435002, China

    Wen-Xue Chen, Yue Du, Li-Na Zhou, Zhi-Yi Zhong, Zhi-**an Shi, Yan Mao, Zi-Quan Zhou, Hao-Yue Feng, Dong-Bin **ong & Yi-Si Liu

  2. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, China

    Yu Su, Hai-Yan Hu & Yao **ao

  3. Hangzhou Hangyang Chemical and Medical Engineering Lo., Hangzhou, 310000, China

    Shi Li

  4. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tian**, 300071, China

    Yao **ao

  5. Innovative Centre for Flexible Devices (iFLEX), Max Planck-NTU Joint Lab for Artificial Senses,, School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Yao **ao

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  12. Dong-Bin **ong
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  13. Jian-Qin Zhou
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  14. Yi-Si Liu
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  15. Yao **ao
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Corresponding authors

Correspondence to Yue Du, Yi-Si Liu or Yao **ao.

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Chen, WX., Du, Y., Zhou, LN. et al. An universal in-situ phosphating strategy to fabricate high-performance Co2P-based bifunctional oxygen electrocatalyst derived from conjugated polyaniline-phytic acid copolymer. Rare Met. (2024). https://doi.org/10.1007/s12598-024-02770-1

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