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首页> 外文期刊>Catalysis science & technology >In situ coating of a N, S co-doped porous carbon thin film on carbon nanotubes as an advanced metal-free bifunctional oxygen electrocatalyst for Zn–air batteries
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In situ coating of a N, S co-doped porous carbon thin film on carbon nanotubes as an advanced metal-free bifunctional oxygen electrocatalyst for Zn–air batteries

机译：原位涂层在碳纳米管上作为碳纳米管上的碳氧化碳薄膜作为Zn – Air电池的先进的无金属双功能电催化剂

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摘要

Reversible oxygen catalysts with good catalytic performance and economic efficiency are urgently needed for the rapid development of metal–air batteries and reversible fuel cells. Herein, a metal-free N, S co-doped porous carbon thin film (NSCF) was coated in situ on carboxylic carbon nanotubes (CNT@NSCF) via a simple and scalable low temperature polymerization–high temperature pyrolysis strategy. By analyzing the surface structure of comparable carbon supports including ketjenblack, Vulcan XC-72 carbon, and activated carbon, it is found that the surface oxygen-containing functional groups of the support are the key factor to obtaining a uniform coating of NSCF with the formation of a large amount of efficient N, S active species. As a result, the optimal CNT@NSCF shows an excellent bifunctional oxygen catalytic activity with a narrow potential difference (ΔE = Ej = 10,OER − E1/2,ORR) value of 0.74 V, which is superior to that of Pt/C + RuO2 (0.75 V) and most metal-free carbon-based oxygen catalysts. Notably, the CNT@NSCF-based rechargeable Zn–air battery delivers a remarkable performance with a high open-circuit voltage and outstanding charge–discharge stability after 213 h, which fully demonstrates the promising practical application potential of the CNT@NSCF catalyst.
机译：对于快速开发金属 - 空气电池和可逆燃料电池，迫切需要具有良好催化性能和经济效率的可逆氧催化剂。此处，通过一种简单且可扩展的低温聚合 - 高温温度热解策略，将无金属的N，S共掺杂的多孔碳薄膜（NSCF）涂在羧基碳纳米管（CNT@NSCF）上。通过分析包括Ketjenblack，Vulcan XC-72碳和活化碳在内的可比较碳支持的表面结构，发现载氧的表面含氧官能团是获得NSCF均匀涂层的关键因素大量有效n，活性物种。结果，最佳CNT@NSCF显示出极好的双功能氧催化活性，其电势差（ΔE= EJ = 10，OER -E1/2，ORR）值为0.74 V，它优于PT/C + RUO2（0.75 V）和大多数无金属的碳氧催化剂。值得注意的是，基于CNT@NSCF的可充电Zn – Air电池可提供出色的性能，并在213小时后具有高的开路电压和出色的充电 - 放电稳定性，这完全证明了CNT@NSCF Catalyst的实践应用潜力。

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