A MOF derived Co-NC@CNT composite with a 3D interconnected conductive carbon network as a highly efficient cathode catalyst for Li–O2 batteries,Sustainable Energy & Fuels

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A MOF derived Co-NC@CNT composite with a 3D interconnected conductive carbon network as a highly efficient cathode catalyst for Li–O2 batteries
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-10-03 , DOI: 10.1039/d0se01154a
Jiaojiao Ren _{1,

2,

3,

4,

5} , Xuanxuan Yang _{1,

2,

3,

4,

5} , Jianfei Yu _{1,

2,

3,

4,

5} , Xizhang Wang _{1,

6,

7,

8,

9} , Yongbing Lou _{1,

2,

3,

4,

5} , Jinxi Chen _{1,

2,

3,

4,

5}

Affiliation

Lithium–oxygen batteries are considered to be one of the most promising next-generation energy storage devices due to their ultra-high theoretical specific capacity and relatively simple structure. Herein, Co-NC@CNTs with a 3D interconnected conductive carbon network were synthesized. Co-NC nanoparticles derived from ZIF-67 as carbon network nodes have micro/mesoporous structures, as well as rich Co species catalytic sites for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). And CNTs as carbon skeletons transfer electrons to enhance the conductivity. Additionally, the interconnected carbon network provides abundant space for accommodating the discharge products and prevents the reduction of catalytically active sites. Therefore, Co-NC@CNTs as a cathode catalyst for Li–O₂ batteries show a high initial discharge capacity of 12572.2 mA h g⁻¹ at 200 mA g⁻¹, good rate capability (5865 mA h g⁻¹@1000 mA g⁻¹), and excellent cycling stability (145 cycles at 250 mA g⁻¹) superior to that of Co-NC and pure CNT cathodes. This study provides effective approaches to design and fabricate promising cathodes to improve the performance of Li–O₂ batteries.

中文翻译：

MOF衍生的具有3D互连导电碳网络的Co-NC @ CNT复合材料，作为Li-O2电池的高效阴极催化剂

锂氧电池由于具有极高的理论比容量和相对简单的结构，因此被认为是最有前途的下一代储能设备之一。在此，合成了具有3D互连导电碳网络的Co-NC @ CNT。源自ZIF-67作为碳网络节点的Co-NC纳米粒子具有微/中微结构，以及用于氧还原反应（ORR）和氧释放反应（OER）的丰富的Co物种催化位点。碳纳米管作为碳骨架转移电子以增强导电性。另外，互连的碳网络为容纳放电产物提供了充足的空间，并防止了催化活性位点的减少。因此，Co-NC @ CNTs作为Li–O ₂的阴极催化剂电池显示12572.2毫安Hg的初期放电容量高^-1以200mA克^-1，良好的倍率性能（5865毫安汞柱^-1 @千毫安克^-1），以及优异的循环稳定性（在250mA克145个周期^-1）优于Co-NC和纯CNT阴极。这项研究提供了有效的方法来设计和制造有前途的阴极，以改善Li–O ₂电池的性能。

更新日期：2020-11-03

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