Niu Ji-Liang, Zeng Cheng-Hui, Peng Hai-Jun, Lin Xiao-Ming, Sathishkumar Palanivel, Cai Yue-Peng
Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, P. R. China.
College of Chemistry and Chemical Engineering, Key Laboratory of Functional Small Organic Molecule, Ministry of Education and Jiangxi's Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang, 330022, P. R. China.
Small. 2017 Dec;13(47). doi: 10.1002/smll.201702150. Epub 2017 Oct 27.
Metal-organic frameworks (MOFs) are very promising self-sacrificing templates for the large-scale fabrication of new functional materials owing to their versatile functionalities and tunable porosities. Most conventional metal oxide electrodes derived from MOFs are limited by the low abundance of incorporated metal elements. This study reports a new strategy for the synthesis of multicomponent active metal oxides by the pyrolysis of polymetallic MOF precursors. A hollow N-doped carbon-coated ZnO/ZnCo O /CuCo O nanohybrid is prepared by the thermal annealing of a polymetallic MOF with ammonium bicarbonate as a pore-forming agent. This is the first report on the rational design and preparation of a hybrid composed of three active metal oxide components originating from MOF precursors. Interestingly, as a lithium-ion battery anode, the developed electrode delivers a reversible capacity of 1742 mAh g after 500 cycles at a current density of 0.3 mA g . Furthermore, the material shows large storage capacities (1009 and 667 mAh g ), even at high current flow (3 and 10 A g ). The remarkable high-rate capability and outstanding long-life cycling stability of the multidoped metal oxide benefits from the carbon-coated integrated nanostructure with a hollow interior and the three active metal oxide components.
金属有机框架材料（MOFs）由于其多样的功能和可调的孔隙率，是大规模制备新型功能材料非常有前景的自牺牲模板。大多数源自MOFs的传统金属氧化物电极受到所含金属元素丰度低的限制。本研究报道了一种通过多金属MOF前驱体热解合成多组分活性金属氧化物的新策略。以碳酸氢铵为造孔剂，通过对多金属MOF进行热退火，制备了一种中空的氮掺杂碳包覆的ZnO/ZnCo₂O₄/CuCo₂O₄纳米杂化物。这是首次关于合理设计和制备由源自MOF前驱体的三种活性金属氧化物组分组成的杂化物的报道。有趣的是，作为锂离子电池负极，所制备的电极在0.3 mA g⁻¹的电流密度下循环500次后，可逆容量达到1742 mAh g⁻¹。此外，即使在高电流密度（3和10 A g⁻¹）下，该材料仍显示出较大的存储容量（分别为1009和667 mAh g⁻¹）。这种多掺杂金属氧化物卓越的高倍率性能和出色的长寿命循环稳定性得益于具有中空内部结构的碳包覆集成纳米结构以及三种活性金属氧化物组分。
