One-step conversion of tannic acid-modified ZIF-67 into oxygen defect hollow Co₃O₄/nitrogen-doped carbon for efficient electrocatalytic oxygen evolution

Abstract

Oxygen defect hollow Co3O4/nitrogen-doped carbon (OV-HCo3O4@NC) nanocomposites were successfully synthesized by simple one-step pyrolysis of tannic acid-modified ZIF-67 (TAMZIF-67). OV-HCo3O4@NC shows good OER electrocatalytic activity and stability.

Magnetic field assisted electrocatalytic oxygen evolution reaction of nickel-based materials

“…The semicircles at high frequencies (HF) and low frequencies (LF) represent the lm resistance (R f ) and the charge transfer resistance (R ct ), respectively. 34,35 The values of R ct under the magnetic eld are statistically shown in Table S1. † The decrease of R ct indicated that the magnetic eld can accelerate the electron transfer process in the OER.…”

Critical Review, Recent Updates on Zeolitic Imidazolate Framework‐67 (ZIF‐67) and Its Derivatives for Electrochemical Water Splitting

“…In 2018, Khalid et al demonstrated the use of a camphor sulfonic acid (CAS) induces topological defects in the Co 3 O 4 /NSC (NSC-N,S co-doped carbon), where abundant defect sites can modulate the surface/ electronic properties of the catalysts to boost catalytic activity. [217] Similarly, the use of tannic acid for the formation of oxygen defects was reported by Wang et al [218] In detail, pyrolysis of tannic-acid modified ZIF-67 (TAMZIF-67) precursor results in the formation of hollow Co 3 O 4 /N-doped carbon composite (O v -HCo 3 O 4 @NC) with oxygen defects. The DFT calculations suggest that O v -HCo 3 O 4 @NC hollow structure catalysts could ensure delocalization of electrons associated with Co-O bond in Co 3 O 4 , which may modulate electronic structure with improved conductivity and provide plenty of active sites to enhance OER activity.…”

Latest trends in the large-scale production of MOFs in accordance with the principles of green chemistry

“…Another advantage is their higher stability in both water and oxygen environments (the metal–oxygen bond is hydrolysed in MOFs). 88,89 This class of compounds also plays a significant role in large-scale production, having a significant impact on ecological, environmental, and economic aspects. The large-scale production of ZIFs is based on the patents of MOF Technologies and BASF, which use the mechanochemistry and electrochemical techniques to synthesise ZIF-67 and ZIF-8.…”