2D-organic framework confined metal single atoms with the loading reaching the theoretical limit,Materials Horizons

当前位置： X-MOL 学术 › Mater. Horiz. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

2D-organic framework confined metal single atoms with the loading reaching the theoretical limit
Materials Horizons ( IF 12.2 ) Pub Date : 2020-08-18 , DOI: 10.1039/d0mh01061h
Chao Lin _{1,

2,

3,

4,

5} , Hao Zhang _{4,

6,

7,

8} , Xiaokai Song _{4,

9,

10,

11} , Dong-Hyung Kim _{5,

12,

13,

14} , Xiaopeng Li _{1,

2,

3,

4} , Zheng Jiang _{4,

6,

7,

8,

15} , Jung-Ho Lee _{5,

12,

13,

14}

Affiliation

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Materials Science and Engineering
Donghua University
Shanghai 201620
China
Department of Materials Science and Chemical Engineering
Shanghai Institute of Applied Physics
Chinese Academy of Sciences
Shanghai 201800
School of Chemical & Environmental Engineering
Jiangsu University of Technology
Changzhou 213001
Hanyang University
Ansan
Korea
Shanghai Synchrotron Radiation Facility

Precise synthesis of single-atom catalysts (SACs) with a homogeneous coordination environment and high metal loading remains a great challenge. Here, for the first time, we demonstrate the preparation of cobalt single atoms with an ultra-high metal loading of 20.5 wt% based on the two-dimensional conjugated organic framework of C₂N. The porous framework of C₂N provides confined space for trapping metal atoms and inhibiting metal aggregation, while the skeleton provides pairs of pyridinic nitrogens as coordination sites to immobilize metal atoms. The as-prepared catalyst exhibited bifunctional activity toward the oxygen reduction and oxygen evolution reactions (ORR and OER). The corresponding rechargeable zinc–air flow battery shows remarkable stability with no degradation even after continuous operation for 6000 cycles (equivalent to 1000 h), placing it as one of the most long-lasting zinc–air batteries. This confined synthetic strategy can be generalized to construct SACs of other metals with different element combinations.

中文翻译：

二维有机骨架限制了金属单原子的负载达到理论极限

具有均一的配位环境和高金属负载量的单原子催化剂（SAC）的精确合成仍然是一个巨大的挑战。这里，对于第一次，我们证明钴单原子的基于C的二维共轭有机骨架的20.5％（重量）的超高金属负载在制备₂ N. C的多孔框架₂N为捕获金属原子和抑制金属聚集提供了狭窄的空间，而骨架则提供了一对吡啶氮作为配位点来固定金属原子。所制备的催化剂对氧还原和氧释放反应（ORR和OER）表现出双功能活性。相应的可充电锌-空气流电池即使在连续运行6000个周期（相当于1000小时）后仍显示出卓越的稳定性，并且不会降解，是最耐用的锌-空气电池之一。可以将这种有限的合成策略推广到构建具有不同元素组合的其他金属的SAC。

更新日期：2020-10-05

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11