Metal–Organic Framework‐Templated Graphitic Carbon Confining MnO/Mn 3 O 4 Nanoparticles via Direct Laser Printing for Electrocatalysis and Supercapacitor

• Published in: Advanced materials interfaces Vol. 8; no. 22
• Main Authors: Lam, Do Van, Dung, Dao Thi, Roh, Euijin, Kim, Jae‐Hyun, Kim, Hyunuk, Lee, Seung‐Mo
• Format: Journal Article
• Language: English
• Published: 01.11.2021
• ISSN: 2196-7350; 2196-7350
• DOI: 10.1002/admi.202101599

Abstract Transition metal oxides with high specific capacities and variable electronic structures are of paramount importance for advanced energy conversion and storage, yet suffering from low electronic conductivity and poor structural stability during the electrochemical process. Herein, via direct laser printing on an Mn‐based metal–organic framework (Mn‐MOF) in air, MnO/Mn 3 O 4 nanoparticles confined in mesoporous graphitic carbon can be mass‐produced rapidly. It is revealed that the structural transformations in manganese oxides (MnO x  → Mn 3 O 4  → MnO) occur during the decomposition of the Mn‐MOF and the MnO/Mn 3 O 4 nanoparticles promote the catalytic graphitization of disordered carbon. The composite shows high electrocatalytic oxygen evolution reaction performances in the alkaline electrolyte with an overpotential of 394 mV at 10 mA cm −2 and good durability of 75% retention after 24 h. In addition, it also exhibits promising supercapacitive performances with a specific capacitance of 194 F g −1 and reasonable stability of 82% retention after 5000 cycles.