氢氧化镍/多壁碳纳米管复合材料的溶剂热法制备及电容性能

采用溶剂热法制备了氢氧化镍/多壁碳纳米管[Ni(OH)2/MWCNTs]复合纳米材料;借助X射线衍射仪和透射电镜分析了产物的结构和形貌,利用循环伏安测试测定了复合材料的电容特性.结果表明:片状β-Ni(OH)2较好地附着在MWCNTs上;复合样品的循环伏安行为明显有别于空白样品Ni(OH)2,峰电流较高.这表明引入MWCNTs可改善Ni(OH)2的电化学性能.与此同时,当MWCNTs的质量分数为10%时,相应的Ni(OH)2/MWCNTs复合物的氧化还原峰电位差最小,循环可逆性最佳.

Synthesis of Ni(OH)2/multi-walled carbon nanotubes composites via solvothermal method and their capacitive performance

Ni（OH）2/MWCNTs（MWCNTs refer to multi-walled carbon nanotubes） composites were synthesized via solvothermal method.The structure and morphology of as-prepared Ni（OH）2/MWCNTs were characterized by X-ray diffraction and transmission electron microscopy.The pseudo-capacitive performance of the as-prepared composites was evaluated by cyclic voltammetric test.Results show that β-Ni（OH）2 nanosheets are uniformly coated on MWCNTs.The cyclic voltammetric behavior of Ni（OH）2/MWCNTs composites with different contents of MWCNTs is much different from that of pristine Ni（OH）2.Namely,the Ni（OH）2/MWCNTs composites exhibit much higher capacitive current response,which indicates that the introduction of MWCNTs has a direct impact on improving the capacitive performance of Ni（OH）2.Besides,the Ni（OH）2/MWCNTs composite with a MWCNTs content of 10% has the smallest redox peak potential difference among all tested composites and possesses a stronger electrochemical reversibility.