Zeolitic imidazolate frameworks derived novel polyhedral shaped hollow Co-B-O@Co 3 O 4 electrocatalyst for oxygen evolution reaction

Dongwon Kim, Daekyu Kim, Youngmoo Jeon, Yong Li, Jeongyeon Lee, Jeongmin Kang, Lawrence Yoon Suk Lee, Yuanzhe Piao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

The development of highly effective and low-cost non-noble metal electrochemical catalysts for oxygen evolution reactions (OER) is a major challenge for overall water splitting and rechargeable metal-air batteries. In this study, we develop a novel hollow cobalt-borate modified cobalt oxide composite (denoted by Co-B-O@Co 3 O 4 ) catalyst derived from zeolitic imidazolate framework-67 (ZIF-67) for electrochemical OER. The Co-B-O@Co 3 O 4 was easily synthesized via pyrolysis of ZIF-67 in Ar and air to produce hollow Co 3 O 4 (denoted by h-Co 3 O 4 ), followed by simple NaBH 4 treatment at ambient temperature for 4 h. The unique polyhedral morphology was well preserved during the NaBH 4 treatment. Benefiting from its structural and compositional merit, the as-synthesized Co-B-O@Co 3 O 4 exhibit excellent electrocatalytic activity and long-term stability for OER. Also, we conducted the OER test using a Co-B-O@Co 3 O 4 catalyst in a neutral pH environment for further investigation. Our study can provide an insight into catalyst modification step to enhance the overall performance while keeping its physical structure simultaneously. using metal-organic framework for the electrochemical catalyst thus can be recognized as a method for producing a highly active, long-term working and novel engineered electrocatalyst for OER applications.

Original languageEnglish
Pages (from-to)213-221
Number of pages9
JournalElectrochimica Acta
Volume299
DOIs
Publication statusPublished - 10 Mar 2019

Keywords

  • Cobalt boron composite
  • Electrocatalyst
  • Metal-organic frameworks
  • Oxygen evolution reaction
  • ZIF-67

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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