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Dispersed Nickel Phthalocyanine Molecules on Carbon Nanotubes as Cathode Catalysts for Li-CO2 Batteries

Journal Article · · Small
 [1];  [2];  [3];  [4];  [2];  [2];  [4];  [4];  [4];  [5];  [4];  [2]
  1. Southern University of Science and Technology (SUSTech), Shenzhen (China); Univ. of Houston, TX (United States)
  2. Southern University of Science and Technology (SUSTech), Shenzhen (China)
  3. Southern University of Science and Technology (SUSTech), Shenzhen (China); Univ. of California, Los Angeles, CA (United States)
  4. Univ. of Houston, TX (United States)
  5. Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
The Li-CO2 battery has great potential for both CO2 utilization and energy storage, but its practical application is limited by low energy efficiency and short cycle life. Efficient cathode catalysts are needed to address this issue. Herein, this work reports on molecularly dispersed electrocatalysts (MDEs) of nickel phthalocyanine (NiPc) anchored on carbon nanotubes (CNTs) as the cathode catalyst for Li-CO2 batteries. The dispersed NiPc molecules efficiently catalyze CO2 reduction, while the conductive and porous CNTs networks facilitate CO2 evolution reaction, leading to enhanced discharging and charging performance compared to the NiPc and CNTs mixture. Octa-cyano substitution on NiPc (NiPc-CN) further enhances the interaction between the molecule and CNTs, resulting in better cycling stability. The Li-CO2 battery with the NiPc-CN MDE cathode shows a high discharge voltage of 2.72 V and a small discharging–charging potential gap of 1.4 V, and can work stably for over 120 cycles. The reversibility of the cathode is confirmed by experimental characterizations. Finally, this work lays a foundation for the development of molecular catalysts for Li-CO2 battery cathodes.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2404871
Journal Information:
Small, Journal Name: Small Journal Issue: 43 Vol. 19; ISSN 1613-6810
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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