TY - JOUR
T1 - Synergistic Enhancement of Supercapacitors with Cobalt–Copper Bimetal–Organic Framework
AU - Zhang, Zhefei
AU - Wang, Zegao
AU - Dong, Mingdong
AU - Zhu, Qiangqiang
AU - Hyldgaard Klausen, Lasse
PY - 2024/7
Y1 - 2024/7
N2 - Metal–organic frameworks (MOFs), as high-potential electrode materials for applications in supercapacitors, have received significant attention recently. Unfortunately, MOF materials still suffer from unsatisfactory specific capacitances due to poor conductivity and limited redox active sites. Herein, a novel cobalt–copper-based bimetal–organic framework (CoCu-MOF) is synthesized by a bottom-up synthesis strategy, the material properties systematically characterized, and finally investigated as a supercapacitor electrode material. The synthesized CoCu-MOF presents a high specific surface area of 62.4 m2 g−1, and 83% of the copper ions attains the +1 oxidation state contributing to the formation of additional redox active sites and leading to the formation of dual-redox sites. The CoCu-MOF displays an excellent specific capacitance of 618 F g−1 at a current density of 1 A g−1, which is more than twice that of Co-MOF and four times that of Cu-MOF. The CoCu-MOF retains 75% of its original capacitance after 3000 charge–discharge cycles at the current density of 1 A g−1. Overall, this work demonstrates how the bimetallic synergistic strategy can effectively enhance the electrochemical properties of MOFs by providing a higher specific surface area and by the introduction of dual redox sites.
AB - Metal–organic frameworks (MOFs), as high-potential electrode materials for applications in supercapacitors, have received significant attention recently. Unfortunately, MOF materials still suffer from unsatisfactory specific capacitances due to poor conductivity and limited redox active sites. Herein, a novel cobalt–copper-based bimetal–organic framework (CoCu-MOF) is synthesized by a bottom-up synthesis strategy, the material properties systematically characterized, and finally investigated as a supercapacitor electrode material. The synthesized CoCu-MOF presents a high specific surface area of 62.4 m2 g−1, and 83% of the copper ions attains the +1 oxidation state contributing to the formation of additional redox active sites and leading to the formation of dual-redox sites. The CoCu-MOF displays an excellent specific capacitance of 618 F g−1 at a current density of 1 A g−1, which is more than twice that of Co-MOF and four times that of Cu-MOF. The CoCu-MOF retains 75% of its original capacitance after 3000 charge–discharge cycles at the current density of 1 A g−1. Overall, this work demonstrates how the bimetallic synergistic strategy can effectively enhance the electrochemical properties of MOFs by providing a higher specific surface area and by the introduction of dual redox sites.
KW - CoCu-metal–organic frameworks
KW - dual-redox-sites
KW - electrical conductivities
KW - supercapacitors
UR - http://www.scopus.com/inward/record.url?scp=85193479069&partnerID=8YFLogxK
U2 - 10.1002/adem.202400378
DO - 10.1002/adem.202400378
M3 - Journal article
AN - SCOPUS:85193479069
SN - 1438-1656
VL - 26
JO - Advanced Engineering Materials
JF - Advanced Engineering Materials
IS - 13
M1 - 2400378
ER -