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    • Doubly-enhanced Strategy to Construct a Highly Efficient Carbon-Based Bifunctional Catalyst to Oxygen Reduction and Oxygen Evolution Reactions for Rechargeable Zinc-Air Batteries

    Tao Xu,Ying Zhang,Zhongping Xiong,Jingqi Sha,Ye Zhang,Mei Yang,Ying Lei,Rong Jin,Lingtao Sun,Haifeng Chen,Yujun Si,Chaozhong Guo

    Journal of Energy Storage（2024）SCI 3区

    Sichuan Univ Sci & Engn | Chongqing Key Laboratory of Materials Surface & Interface Science

    Cited 1|Views22
    Abstract
    Regulating the oxygen evolution reaction (OER) performance of N-doped carbon-based catalyst to oxygen reduction reaction (ORR) is of prospective to the wide-ranging applications of rechargeable zinc-air batteries. In this work, a facile double-enhancing strategy is proposed to prepare a bifunctional catalyst to ORR and OER. In the strategy, the smaller carbon particles were generated by carbonizing cyclodextrin. The fresh carbon particles can well react with the gasified product of melamine to facilitate the anchoring of nitrogen to prepare the N- doped Fe-N-CD-C-A2 catalyst for ORR. Then, an OER enhanced bifunctional catalyst Fe-N-CD-C-A2-Ni was prepared by separately blending Ni2+and OHwith Fe-N-CD-C-A2 to evenly load Ni(OH)2 particles as an OER catalyst. Benefiting from the intentionally regulated properties, the Fe-N-CD-C-A2-Ni shows 0.8728 V of ORR half wave potential and 1.5868 V of OER potential at 10 mA cm2, both being realized in a practical rechargeable zinc-air battery with 1.526 V of open circuit potential, 192 mW cm2 of peak power density, 1.18-1.27 V of discharge voltage plateau and 957 mWh g-1 Zn of energy density. Importantly, the Fe-N-CD-C-A2-Ni exhibits superior rechargeability and durability during the discharge-recharge cycles, being better than Pt/C +RuO2 catalyst and revealing promising prospects for practical application
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    Key words
    Oxygen reduction reaction,Oxygen evolution reaction,Bifunctional catalyst,Cyclodextrin,Nickel hydroxide
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    【要点】：本研究提出了一种双增强策略，成功制备了一种高效的双功能碳基催化剂，用于氧还原反应（ORR）和氧进化反应（OER），显著提升了锌-空气电池的充放电性能。
    

    【方法】：通过碳化环糊精生成小碳颗粒，并与气化后的三聚氰胺反应，制备N掺杂的Fe-N-CD-C-A2催化剂，进而通过混合Ni2+和OH-与Fe-N-CD-C-A2，制备具有OER增强的双功能催化剂Fe-N-CD-C-A2-Ni。
    

    【实验】：实验中，Fe-N-CD-C-A2-Ni催化剂在ORR半波电位达到0.8728 V，OER电位达到1.5868 V（10 mA cm²），在可充电锌-空气电池中实现了1.526 V的开路电压、192 mW cm²的峰值功率密度、1.18-1.27 V的放电电压平台以及957 mWh g-1 Zn的能量密度。该催化剂在充放电循环中展现出优于Pt/C + RuO2催化剂的循环性能和耐久性。