Journal
CHEMICAL ENGINEERING JOURNAL
Volume 444, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136544
Keywords
Cobalt polyphthalocyanine; Catalyst; Conjugated; Defect engineering; Li-oxygen batteries
Categories
Funding
- Open Research Fund of Songshan Lake Materials Laboratory [2021SLABFN04]
- National Natural Science Foundation of China [22109134, 22005207]
- Guang-dong Basic and Applied Basic Research Foundation [2019A1515011819]
- Science and Technology Foundation of Shenzhen [JCYJ20190808153609561]
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The cobalt polyphthalocyanine with defective polymeric layered structure (D-CoPPc) prepared by annealing treatment exhibits excellent catalytic activity, high conductivity, and structural stability in Li-O2 batteries, showing potential to improve the specific capacity, rate capability, and cycling stability of the battery.
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 pi-pi 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 mu A cm-2, a remarkable rate capability with the discharge voltage reached at 2.55 V at a current density of 500 mu A cm-2, and a superior cycling stability of more than 1000 h at 20 mu A 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.
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