123rd General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Exhibition Hall 2
Time 4월 18일 (목요일) 11:00~12:30
Code ELEC.P-485
Subject Structure preserving transformation of zeolitic imidazolate frameworks into polyhedral shaped hollow Co-B-O@Co3O4 catalysts for oxygen evolution reaction
Authors Daekyu Kim, Yuanzhe Piao*
Graduate School of Convergence Science and Technol, Seoul National University, Korea
Abstract Designing highly efficient and low-cost electrocatalysts for oxygen evolution reaction is required to promote the overall water splitting reaction. In this work, polyhedral shaped hollow cobalt-borate modified cobalt oxide composite (denoted as Co-B-O@Co3O4) electrocatalysts are successfully synthesized via calcination of ZIF-67 followed by NaBH4 treatment. The prepared Co-B-O@Co3O4 catalysts maintain well unique polyhedral morphology of ZIF-67 after the NaBH4 treatment. The unique polyherdral shaped hollow structure can effectively expose more active sites and enhance the mass transport. In addition, the introduced boron can tune the electronic structure and consequently improve the charge transfer of the catalysts. Benefiting from the above properties, the synthesized Co-B-O@Co3O4 catalysts show high catalytic activity and long-term stability for OER in alkaline solution. We further studied the catalytic performance of Co-B-O@Co3O4 in neutral pH environment. Our research can give perspective of catalyst tuning method to improve the overall catalytic performance while preserving its original structure simultaneously.
E-mail sksy1285@snu.ac.kr