Controllable Synthesis of Layered Co–Ni Hydroxide Hierarchical Structures for High-Performance Hybrid Supercapacitors
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Release time:2021-02-28 Impact Factor:3.442 DOI number:10.1016/j.jpcs.2015.09.006 Journal:JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS Key Words:ELECTRODE MATERIALS; NICO2O4 NANOSHEETS; COBALT HYDROXIDE; GROWTH; NANOPARTICLES; MICROSPHERES; SPHERES Abstract:A facile solvothermal method is developed for synthesizing layered Co-Ni hydroxide hierarchical structures by using hexamethylenetetramine (HMT) as alkaline reagent. The electrochemical measurements reveal that the specific capacitances of layered bimetallic (Co-Ni) hydroxides are generally superior to those of layered monometallic (Co, Ni) hydroxides. The as-prepared Co0.5Ni0.5 hydroxide hierarchical structures possesses the highest specific capacitance of 1767 F g(-1) at a galvanic current density of 1 A g(-1) and an outstanding specific capacitance retention of 87% after 1000 cycles. In comparison with the dispersed nanosheets of Co-Ni hydroxide, layered hydroxide hierarchical structures show much superior electrochemical performance. This study provides a promising method to construct hierarchical structures with controllable transition-metal compositions for enhancing the electrochemical performance in hybrid supercapacitors. Indexed by:Journal paper Volume:10 Page Number:3506-3514 Translation or Not:no Date of Publication:2016-01-12 Included Journals:SCI -
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