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N, P-co doped carbon nanotubes coupled with Co2P nanoparticles as bifunctional oxygen electrocatalyst
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.jelechem.2020.114327
Dan Zhang , Panpan Sun , Zhuang Zuo , Tao Gong , Niu Huang , Xiaowei Lv , Ye Sun , Xiaohua Sun

Abstract Employing P-doped polypyrrole nanotubes as precursor, we have constructed a structure of N, P-codoped carbon nanotubes coupled with Co2P nanoparticles (Co2P/NPC). Herein, P element serves as a bridging agent enabling strong electronic coupling between NPC and Co2P. While Co2P with good electrical conductivity facilitates electron transfer during electrocatalytic process. As a result, Co2P/NPC can catalyze oxygen reduction reaction (ORR) in a direct 4e− pathway, reaching a half-wave potential of 0.835 V vs. RHE and a smaller Tafel slope of 45.9 mV dec−1 than commercially available Pt/C. On the other hand, Co2P/NPC can also catalyze oxygen evolution reaction (OER) in a low overpotential of 320 mV at 10 mA cm−2 and a smaller Tafel slope of 59.6 mV dec−1 than commercially available RuO2. Finally, the potential application of Co2P/NPC catalyst is estimated in case of rechargeable Zn-air battery. As air electrode, Co2P/NPC achieves a power density of 154 mW cm−2 and good long-term cycling stability (over 90 h at 5 mA cm−2). Our work thus provides a facile strategy to achieve bifunctional ORR/OER performance for application in next-generation energy conversion systems.

中文翻译:

N, P-co 掺杂的碳纳米管与 Co2P 纳米粒子耦合作为双功能氧电催化剂

摘要 以P 掺杂的聚吡咯纳米管为前驱体,我们构建了N,P 共掺杂的碳纳米管与Co2P 纳米颗粒(Co2P/NPC)结合的结构。在此,P 元素充当桥接剂,使 NPC 和 Co2P 之间具有强电子耦合。而具有良好导电性的 Co2P 有利于电催化过程中的电子转移。因此,Co2P/NPC 可以在直接 4e− 途径中催化氧还原反应 (ORR),达到 0.835 V vs. RHE 的半波电位和比市售 Pt/Pt/ 更小的塔菲尔斜率 45.9 mV dec−1 C。另一方面,与市售的 RuO2 相比,Co2P/NPC 还可以在 10 mA cm-2 下以 320 mV 的低过电位和更小的 Tafel 斜率 59.6 mV dec-1 催化析氧反应(OER)。最后,在可充电锌空气电池的情况下,估计了 Co2P/NPC 催化剂的潜在应用。作为空气电极,Co2P/NPC 实现了 154 mW cm-2 的功率密度和良好的长期循环稳定性(5 mA cm-2 下超过 90 小时)。因此,我们的工作提供了一种简便的策略来实现双功能 ORR/OER 性能,以应用于下一代能量转换系统。
更新日期:2020-08-01
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