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A metal and nitrogen doped carbon composite with both oxygen reduction and evolution active sites for rechargeable zinc–air batteries
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2020-06-18 , DOI: 10.1039/d0ta02544e
Jinjie Fang 1, 2, 3, 4, 5 , Xuejiang Zhang 2, 3, 4, 5 , Xingdong Wang 2, 3, 4, 5 , Di Liu 2, 3, 4, 5 , Yanrong Xue 2, 3, 4, 5 , Zhiyuan Xu 1, 2, 3, 4, 5 , Yufeng Zhang 2, 3, 4, 5 , Chun Song 2, 3, 4, 5 , Wei Zhu 2, 3, 4, 5 , Zhongbin Zhuang 1, 2, 3, 4, 5
Affiliation  

Rechargeable zinc–air batteries (ZABs) are promising renewable energy storage devices due to their high energy density and preeminent safety. However, they still require highly active and stable oxygen reduction/evolution reaction (ORR/OER) bi-functional catalysts to promote their performance. Here, we report the synthesis of Fe,Ni on N doped carbon sheets supported on N doped carbon nanotubes (Fe,Ni–N–C/N-CNT), which shows ORR activity with a half wave potential of 0.879 V and an OER activity of 315 mV overpotential at a current density of 10 mA cm−2. Using Fe,Ni–N–C/N-CNT as the air electrode, the fabricated primary ZAB shows a high peak power density of 271 mW cm−2, and the rechargeable ZAB can stably operate for more than 200 h with a high energy efficiency of 61%, surpassing the conventional ZABs using Pt/C–IrO2. We find that the ORR activity is related to the Fe–N–C species in the catalysts, while the in situ generated NiFe2O4 nanoparticles under the OER conditions are beneficial for the OER activity. Poly(ethylene imine) used in the synthesis was found to be important for obtaining a high performance catalyst and helps the binding of the carbon sheets containing the Fe–N–C sites to carbon nanotubes and also the capture of the in situ generated NiFe2O4 nanoparticles. These results demonstrated the high potential of functionalized carbon composites for application in rechargeable ZABs.

中文翻译:

一种金属和氮掺杂的碳复合材料,具有氧还原和析出活性位,可用于可充电锌空气电池

可充电锌空气电池(ZAB)由于其高能量密度和卓越的安全性而成为有前途的可再生能源存储设备。但是,它们仍然需要高活性和稳定的氧还原/放出反应(ORR / OER)双功能催化剂来提高其性能。在这里,我们报告了在N掺杂碳纳米管(Fe,Ni–N–C / N-CNT)上负载的N掺杂碳片上的Fe,Ni的合成,其显示了半波电势为0.879 V的ORR活性和OER电流密度为10 mA cm -2时315 mV超电势的活性。使用Fe,Ni–N–C / N-CNT作为空气电极,制造的初级ZAB表现出271 mW cm -2的高峰值功率密度,可充电ZAB可以稳定运行200个小时以上,具有61%的高能效,超过了使用Pt / C–IrO 2的常规ZAB 。我们发现,ORR活性与催化剂中的Fe–N–C种类有关,而OER条件下原位生成的NiFe 2 O 4纳米颗粒对OER活性有利。合成中使用的聚乙烯亚胺被发现对于获得高性能催化剂很重要,它有助于将含有Fe–N–C位的碳片与碳纳米管结合并捕获原位生成的NiFe 2 Ø 4纳米粒子。这些结果证明了功能化碳复合材料在可再充电ZAB中的应用具有很高的潜力。
更新日期:2020-08-11
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