Metal–Organic Framework‐Templated Graphitic Carbon Confining MnO/Mn3O4 Nanoparticles via Direct Laser Printing for Electrocatalysis and Supercapacitor. Issue 22 (27th October 2021)

• Record Type: Journal Article
• Authors: Lam, Do Van; Dung, Dao Thi; Roh, Euijin; Kim, Jae‐Hyun; Kim, Hyunuk; Lee, Seung‐Mo
• Is Part Of: Advanced materials interfaces. Volume 8:Issue 22(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-10-27
• Subjects: direct laser printing -- electrocatalysts -- manganese oxide -- mesoporous graphitic carbon -- metal–organic frameworks -- supercapacitors; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202101599
• Languages: English
• ISSNs: 2196-7350

Abstract

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/Mn3 O4 nanoparticles confined in mesoporous graphitic carbon can be mass‐produced rapidly. It is revealed that the structural transformations in manganese oxides (MnO x → Mn3 O4 → MnO) occur during the decomposition of the Mn‐MOF and the MnO/Mn3 O4 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. Abstract : Unlike thermal calcination in the air that converts an Mn‐based metal–organic framework (Mn‐MOF) into Mn3 O4 skeletons, direct laser printing in the air can transform the Mn‐MOF into composites of MnO/Mn3 O4 nanoparticles confined in large content of graphitic carbon highly useful for electrocatalysis and supercapacitor.