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论文类型：期刊论文
发表时间：2017-02-01
发表刊物：ADVANCED FUNCTIONAL MATERIALS
收录刊物：SCIE、EI
卷号：27
期号：5
ISSN号：1616-301X
摘要：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 MoxW1-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 Mo0.8W0.2O2-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.