Bi-functionality of mesostructured MnCo₂O₄ microspheres for supercapacitor and methanol electro-oxidation

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• 作者：Gaurav M. Thorat ; Harsharaj S. Jadhav ; Jeong Gil Seo ; ^{jgseo@mju.ac.kr}
• 关键词：Spinel structure ; MnCo2O4 microsphere ; Pseudo capacitive ; Methanol electro-oxidation
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：43
• 期：2
• 页码：2670-2679
• 全文大小：1201 K
• 卷排序：43

文摘

In this work, we describe the synthesis of hierarchically mesoporous MnCo2O4 microspheres via a urea-assisted co-precipitation method, followed by a post-annealing treatment in air. The stoichiometric amount of urea serves as a self-template to favor the self-assembly of hierarchically well-organized, 3D interconnected precursor carbonate microspheres under optimized reaction conditions. An electrode fabricated from micro/nano-structured MnCo2O4 delivers an excellent multi-functional electrochemical performance when used in supercapacitors and methanol electro-oxidations. The electrode exhibits a high specific capacitance of 1857 F/g at a 5 mV/s scan rate, and 97% capacitance retention after 5000 cycles. Also, as an electro-catalyst for methanol oxidation, it maintains an optimum current density up to 95 A/g. The superior electrochemical performance might be attributed to its three-dimensional interconnected porous architecture, which offers a rapid ion/electron transfer, and structural stability. The synthesis method adopted in the present study is simple, controllable, and easy to carry out at a production scale. Furthermore, the superior electrochemical performance of the as-obtained MnCo2O4 microspheres renders them a potential candidate for various energy applications.