Pomegranate-Inspired Design of Highly Active and Durable Bifunctional Electrocatalysts for Rechargeable Metal-Air Batteries
Pomegranate-Inspired Design of Highly Active and Durable Bifunctional Electrocatalysts for Rechargeable Metal-Air Batteries
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DOI：
10.1002/anie.201600750
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发表时间：
2016-04-11
影响因子：
16.6
通讯作者：
Chen, Zhongwei
中科院分区：
文献类型：
--
作者：
Li, Ge;Wang, Xiaolei;Chen, Zhongwei
合理设计高活性和高耐久性的氧反应电催化剂是可充电金属空气电池的关键。在这里，我们报告的设计和发展的基础上，过渡金属氧化物纳米晶体嵌入在氮掺杂，部分石墨化的碳框架的复合电催化剂。该复合催化剂具有丰富的活性中心、较强的协同偶联作用、较强的电子转移能力以及较高的氧还原反应（ORR）和析氧反应（OER）效率。Co_3O_4基复合电催化剂在10 mAcm ~（-2）电流密度下，具有0.842V的氧化还原半波电位和450 mV的过氧化还原过电位。单电池锌-空气电池也被制造具有上级耐久性，在可充电金属-空气电池的实际实施中具有很大的希望。
Rational design of highly active and durable electrocatalysts for oxygen reactions is critical for rechargeable metal-air batteries. Herein, we report the design and development of composite electrocatalysts based on transition metal oxide nanocrystals embedded in a nitrogen-doped, partially graphitized carbon framework. Benefiting from the unique pomegranate-like architecture, the composite catalysts possess abundant active sites, strong synergetic coupling, enhanced electron transfer, and high efficiencies in the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The Co3O4-based composite electrocatalyst exhibited a high half-wave potential of 0.842V for ORR, and a low overpotential of only 450mV at the current density of 10mAcm(-2) for OER. A single-cell zinc-air battery was also fabricated with superior durability, holding great promise in the practical implementation of rechargeable metal-air batteries.