Zeng Yinxiang, Wang Yan, Jin Qi, Pei Zhihao, Luan Deyan, Zhang Xitian, Lou Xiong Wen David
School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
School of Physics and Electronic Engineering, Harbin Normal University, Harbin, 150025, P. R. China.
Angew Chem Int Ed Engl. 2021 Dec 1;60(49):25793-25798. doi: 10.1002/anie.202113487. Epub 2021 Nov 5.
Mn-based oxides have sparked extensive scientific interest for aqueous Zn-ion batteries due to the rich abundance, plentiful oxidation states, and high output voltage. However, the further development of Mn-based oxides is severely hindered by the rapid capacity decay during cycling. Herein, a two-step metal-organic framework (MOF)-engaged templating strategy has been developed to rationally synthesize heterostructured Mn O -ZnMn O hollow octahedrons (MO-ZMO HOs) for stable zinc ion storage. The distinctive composition and hollow heterostructure endow MO-ZMO HOs with abundant active sites, enhanced electric conductivity, and superior structural stability. By virtue of these advantages, the MO-ZMO HOs electrode shows high reversible capacity, impressive rate performance, and outstanding electrochemical stability. Furthermore, ex situ characterizations reveal that the charge storage of MO-ZMO HOs mainly originates from the highly reversible Zn insertion/extraction reactions.
由于丰富的储量、多样的氧化态和高输出电压，锰基氧化物引发了人们对水系锌离子电池的广泛科学兴趣。然而，锰基氧化物的进一步发展受到循环过程中快速容量衰减的严重阻碍。在此，开发了一种两步金属有机框架（MOF）参与的模板策略，以合理合成用于稳定锌离子存储的异质结构MnO-ZnMnO空心八面体（MO-ZMO HOs）。独特的组成和中空异质结构赋予MO-ZMO HOs丰富的活性位点、增强的电导率和优异的结构稳定性。凭借这些优势，MO-ZMO HOs电极表现出高可逆容量、令人印象深刻的倍率性能和出色的电化学稳定性。此外，非原位表征表明，MO-ZMO HOs的电荷存储主要源于高度可逆的锌插入/脱出反应。
