Conjugated cobalt polyphthalocyanine with defective π-π extended structure for enhanced rechargeable li-oxygen batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jiafeng He
  • Qi Feng
  • Xiaoke Wang
  • Xiliang Zhao
  • Minwei Xu
  • Xiang Wu
  • Hongfei Li
  • Cuiping Han

Detail(s)

Original languageEnglish
Article number136544
Journal / PublicationChemical Engineering Journal
Volume444
Online published22 Apr 2022
Publication statusPublished - 15 Sep 2022

Abstract

The urgent demand for high-energy and high-power energy storage devices initiates considerable interest for LiO2 batteries. Considering the catalytic reaction that happened on the cathode, the electrocatalyst plays a key role in deciding the performance of Li-O2 batteries. Herein, a cobalt polyphthalocyanine with defective polymeric layered structure (D-CoPPc) is prepared by an annealing treatment. The macromolecular structure of D-CoPPc overcomes the dissolution of cobalt phthalocyanine (CoPc) therefore guarantying structural stability. Such a distinctive structure provides imperative features for Li-O2 batteries involving the intrinsic high catalytic activity of CoPc unit, high conductivity given by π-π extended conjugated skeleton. Moreover, the introduced irregular structural defects are expected to promote the diffusion of oxygen. As a result, Li-O2 battery with D-CoPPc as a catalyst achieves a high specific capacity of 4.0 mA h cm-2 at a current density of 50 μA cm-2, a remarkable rate capability with the discharge voltage reached at 2.55 V at a current density of 500 μA cm-2, and a superior cycling stability of more than 1000 h at 20 μA cm-2. As such, the presented framework tailoring and defect engineering strategy open new avenues to regulate the catalytic activity for high-performance metal-oxygen batteries.

Research Area(s)

  • Cobalt polyphthalocyanine, Catalyst, Conjugated, Defect engineering, Li-oxygen batteries, LI-O-2 BATTERIES, ELECTROCATALYST, PERFORMANCE, CATALYSTS, CATHODE, REDUCTION

Citation Format(s)

Conjugated cobalt polyphthalocyanine with defective π-π extended structure for enhanced rechargeable li-oxygen batteries. / He, Jiafeng; Hong, Hu; Feng, Qi; Wang, Xiaoke; Zhao, Xiliang; Xu, Minwei; Wu, Xiang; Li, Hongfei; Zhi, Chunyi; Han, Cuiping.

In: Chemical Engineering Journal, Vol. 444, 136544, 15.09.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review