Utilizing MOF precursors toward one-step, calcination-free synthesis of MnO2 superstructures for superior lithium storage. Issue 1 (1st December 2022)

• Record Type: Journal Article
• Authors: Fan, Yang; Luo, Deli; Wu, Yan; Peng, Tianlang; Qi, Qi; Han, Xubing; Zhou, Jinxin; Wang, Yanling; Lin, Bao; Xiong, Qinqin; Yuan, Yongjun; Qin, Haiying; Hu, Xiaoshi
• Is Part Of: Sustainable energy & fuels. Volume 7:Issue 1(2023)
• Page Start: 181
• Page End: 189
• Publication Date: 2022-12-01
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/d2se01224c
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : A facile one-step, calcination-free strategy involving metal–organic framework templates was developed for synthesis of MnO2 superstructure with superior lithium storage properties, offering considerable advantages over the conventional thermal method. Abstract : Rationally controlled synthesis of transition metal oxide materials for structure-related applications in diverse areas at room temperature and ambient atmosphere remains a challenge. In this article, we propose a facile one-step calcination-free approach for the rational and green synthesis of 3D hierarchical polyhedron-shaped superstructures of manganese dioxide (MnO2 ) through the simultaneous ion exchange and oxidation of a preformed Mn-based M2 (dobdc) (dobdc = 2, 5-dihydroxy-1, 4-benzenedicarboxylate) MOF (CPO-27-Mn) template with an adequate open aqueous alkaline solution of a moderate concentration at room temperature, as well as their application in rechargeable lithium cells. Concretely, we proposed that during the solution-phase process, upon exchange of the anionic dobdc 4− ligand with OH −, the resultant intermediate manganese hydroxide reacts with dissolved O2 in solution to form MnO2 . Electrochemical evaluation showed that the as-synthesized hierarchical MnO2 superstructures exhibited excellent electrochemical performance, including high reversible specific reversibility (866.4 mA h g −1 ), superior rate capability and long-term cycling stability (797.9 mA h g −1 after 300 cycles at 1000 mA g −1 ) when serving as anodes. This unique novel MOF-derived protocol provides an alternative perspective on the designed fabrication of advanced transition metal oxide functional nanomaterials.