One-step Conversion of Tannic Acid-modified ZIF-67 into Oxygen Defect Hollow CoO/nitrogen-doped Carbon for Efficient Electrocatalytic Oxygen Evolution

Overview

Journal RSC Adv

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2022 May 6

PMID 35518438

Authors

Changshui Wang

Jiahui Zhang

Zenong Zhang

Guancheng Ren

Dandan Cai

Affiliations

Soon will be listed here.

Abstract

Controllable structure and defect design are considered as efficient strategies to boost the electrochemical activity and stability of catalysts for the oxygen evolution reaction (OER). Herein, oxygen defect hollow CoO/nitrogen-doped carbon (O-HCoO@NC) composites were successfully synthesized using tannic acid-modified ZIF-67 (TAMZIF-67) as the precursor through a one-step pyrolysis. Tannic acid provides abundant oxygen during the pyrolysis process of the modified ZIF-67, which can contribute to the formation of oxygen defects and the construction of a hollow structure. The existence of oxygen defects is shown by X-ray photoelectron spectroscopy and electron paramagnetic resonance, whereas the hollow structure is confirmed by transmission electron microscopy. The optimized O-HCoO@NC shows good electrocatalytic activity and exhibits a low overpotential of 360 mV at a current density of 10 mA cm in 0.1 M KOH due to the hollow structure, abundant oxygen defects, and good electrical conductivity. This work provides valuable insights into the exploration of promising OER electrocatalysts with oxygen defects and special structures.

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