A Polymetallic Metal-Organic Framework-Derived Strategy toward Synergistically Multidoped Metal Oxide Electrodes with Ultralong Cycle Life and High Volumetric Capacity

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• 作者：Shanshan Niu ; Zhiyu Wang ; Tao Zhou ; Mingliang Yu ; Mengzhou Yu and Jieshan Qiu
• 刊名：Advanced Functional Materials
• 出版年：2017
• 出版时间：February 3, 2017
• 年：2017
• 卷：27
• 期：5
• 全文大小：3413K
• ISSN：1616-3028

文摘

Metal-organic frameworks (MOFs) are very convenient self-templated precursors toward functional materials with tunable functionalities. Although a huge family of MOFs has been discovered, conventional MOF-derived strategies are largely limited to the sole MOF source based on a handful of the metal elements. The limitation in structure and functionalities greatly restrains the maximum performance of MOF-based materials for fulfilling the practical potential. This study reports a polymetallic MOF-derived strategy for easy synthesis of metal-oxide-based nanohybrids with precisely tailored multicomponent active dopants. A variety of MoO₂-based nanohybrids with synergistical co-doping of W, Cu, and P are yielded by controlled pyrolysis of tailor-made polymetallic MOFs. The W doping induces the formation of Mo_xW_1−xO₂ solid solution with better activity. The homogeneous dispersion of Cu nanocrystallites in robust P-doped carbon skeleton creates a conductive network for fast charge transfer. Boosting by synergistically multidoping effect, the Mo_0.8W_0.2O₂-Cu@P-doped carbon nanohybrids with optimized composition exhibit exceptionally long cycle life of 2000 cycles with high capacities but very slow capacity loss (0.043% per cycle), as well as high power output for lithium storage. Remarkably, the co-doping of heavy W and Cu elements in MoO₂ with high density makes them particularly suitable for high volumetric lithium storage.