将 CoFe 合金纳米粒子与氮掺杂碳纳米管原位集成作为先进的锌空气电池双功能阴极催化剂。

In situ integration of CoFe alloy nanoparticles with nitrogen-doped carbon nanotubes as advanced bifunctional cathode catalysts for Zn-air batteries.

机构信息

Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.

Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China.

出版信息

Nanoscale. 2016 Dec 8;8(48):20048-20055. doi: 10.1039/c6nr08057j.

DOI:10.1039/c6nr08057j

PMID:27883155

Abstract

Electrochemical catalysis of O-incorporated reactions is a promising strategy for metal-air batteries. The performance of metal-air batteries is determined by the catalytic activities of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Therefore, developing efficient catalysts with superior activities for the ORR and OER is of great significance to expand the application range of metal-air batteries. Herein, CoFe alloy nanoparticles adhered to the inside wall of nitrogen doped carbon nanotubes (CoFe@NCNTs) are synthesized and can function as a Janus particle to efficiently catalyze the ORR and OER with desirable activities in 0.1 M KOH solution. Specifically, the CoFe@NCNTs present an onset potential of 0.95 V and a half-wave potential of 0.84 V as an ORR catalyst. When used as an air-cathode catalyst for a Zn-air battery, the CoFe@NCNTs cathode performs better than a Pt/C cathode, showing a high open-circuit potential of 1.45 V, a maximum power density of 150 mW cm and an average specific capacity of 808 mA h g at current densities from 2 mA cm to 10 mA cm.

摘要

氧掺杂反应的电化学催化是金属空气电池的一种很有前途的策略。金属空气电池的性能取决于氧还原反应（ORR）和氧析出反应（OER）的催化活性。因此，开发具有优异 ORR 和 OER 催化活性的高效催化剂对于扩大金属空气电池的应用范围具有重要意义。本文中，我们合成了负载在氮掺杂碳纳米管（CoFe@NCNTs）内壁上的 CoFe 合金纳米粒子，该纳米粒子可以作为 Janus 粒子，在 0.1 M KOH 溶液中高效催化 ORR 和 OER，具有理想的活性。具体来说，CoFe@NCNTs 作为 ORR 催化剂的起始电位为 0.95 V，半波电位为 0.84 V。当用作锌空气电池的空气阴极催化剂时，CoFe@NCNTs 阴极的性能优于 Pt/C 阴极，开路电位为 1.45 V，在电流密度为 2 mA cm 至 10 mA cm 时，最大功率密度为 150 mW cm，平均比容量为 808 mA h g。