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Updated: Sep 11, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Tailoring Multiple Coordination Environments of Cobalt-Only Ladder Organic Framework for Bifunctional Oxygen
Zhen Zhang1, Shilong Wen1, Junyu Wang1
1College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China.
None:
Developing efficient oxygen electrocatalysts is crucial for the progress of future energy conversion and storage systems. Herein, a fully conjugated ladder organic framework is designed with densely populated cobalt sites (HATN-BiSalphen@KB). The molecular characteristics of the catalytic sites provide a trustworthy model for investigating the oxygen catalysis mechanism. Theoretical calculations combined with in situ ATR-FTIR spectroscopy demonstrate that the electronic interaction of the Co2N4O2 and CoN2Cl2 sites shifts the d-band center of Co atoms, optimizing oxygen intermediate adsorption/desorption energetics and boosting bifunctional catalytic performance. Consequently, the catalyst exhibits exceptional bifunctional activity, achieving a remarkable oxygen reduction reaction (ORR) half-wave potential of 0.983 V alongside a low oxygen evolution reaction (OER) overpotential of 310 mV at 10 mA cm-2. In addition, the assembled rechargeable zinc-air batteries demonstrate a high peak power density of 254.1 mW cm-2 and outstanding charge-discharge cycling stability for 450 h. This work provides valuable insights into designing advanced bifunctional oxygen electrocatalysts through atomic-level modulation of the coordination environment.
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