Ni_(2)P@CoP_(3)核壳纳米球的制备、表征及其用于超级电容器性能  

Synthesis and Characterization of Ni_(2)P@CoP_(3) Core-Shell Nanospheres for Supercapacitors

作　　者：汪明 蔡园园 杨艺 祝典 张娜娜 汪美芳 李祥子[1,2] WANG Ming;CAI Yuan‑Yuan;YANG Yi;ZHU Dian;ZHANG Na‑Na;WANG Mei‑Fang;LI Xiang‑Zi(Institute of Synthesis and Application of Medical Materials,College of Pharmacy,Wannan Medical College,Wuhu,Anhui 241000,China;Anhui Laboratory of Molecule-Based Materials,Anhui Normal University,Key Laboratory of Functional Molecular Solids,The Ministry of Education,Wuhu,Anhui 241000,China)

机构地区：[1]皖南医学院药学院医用材料合成应用研究所,芜湖241002 [2]安徽师范大学分子基材料安徽省重点实验室,功能固体教育部重点实验室,芜湖241000

出　　处：《无机化学学报》2021年第9期1633-1641,共9页Chinese Journal of Inorganic Chemistry

基　　金：安徽省高校自然科学基金(No.KJ2020A0619);安徽省自然科学基金(No.2008085ME124);安徽省重点研发项目(No.202004d07020005);安徽省高等学校拔尖人才项目(No.gxbjZD2020070);安徽省学术和技术带头人后备人选学术资助项目(No.2019H227);功能分子固体教育部重点实验室(No.FMS201917);分子基材料安徽省重点实验室(No.fzj20006);校级重点科研项目(WK2019ZF14);大学生创新创业项目(No.20201036803,S201910368081,S202010368062)资助。

摘　　要：利用水热技术先后获得Ni纳米球和Ni@Co(OH)_(2)海胆状核壳纳米球前驱体,通过高温煅烧法获得NiO@CoO核壳纳米球,再以次磷酸钠为原料,通过高温磷化法最终获得Ni_(2)P@CoP_(3)核壳纳米球。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、高角度环形暗场像扫描透射电子显微镜(HAADF-STEM)、X射线粉末衍射仪(XRD)、能谱仪(EDS)及X射线光电子能谱(XPS)对产物的形貌、结构和组成进行表征。采用循环伏安(CV)、恒电流充放电(GCD)以及循环稳定性实验探索了电极材料的电化学性能。结果表明,Ni_(2)P@CoP_(3)核壳纳米球的直径约为400 nm,由六方系Ni_(2)P纳米核和立方相CoP3纳米壳构成。相比单纯的Ni_(2)P或CoP3纳米球,Ni_(2)P@CoP_(3)核壳纳米球发挥了复合结构的协同效应,更加有利于电解液的质子传递,促进了赝电容反应,表现出更高的比容量、稳定性和更长的循环寿命。Ni nanospheres and Ni@Co(OH)_(2) nano-urchin-spheres precursor were successively fabricated with hydro-thermal technique,and then the latter were changed into NiO@CoO by high temperature calcination process,and Ni_(2)P@CoP_(3) core-shell nanospheres were finally obtained using sodium hypophoshpite as raw material by high temperature phosphating process.The morphologies,structures and compositions of the as-obtained products were characterized by scanning electron microscope(SEM),transmission electron microscope(TEM),high angle annular dark field-scanning transmission electron microscope(HAADF-STEM),X-ray powder diffractometer(XRD),energy dispersive spectrometer(EDS)and X-ray photoelectron spectroscopy(XPS).At the same time,the electrochemical performance of the electrodes were investigated by cyclic voltammetry(CV),galvanostatic charge/discharge(GCD)and cycling stability experiments.The results showed that as-obtained Ni_(2)P@CoP_(3) core-shell nanospheres with diam-eter of~400 nm were composed of hexagonal Ni_(2)P nanocore and cubic CoP3 nanoshell.Compared with pure Ni_(2)P or CoP3 nanospheres,Ni_(2)P@CoP_(3) core-shell nanospheres are more conducive to the mass transfer of electrolyte and promote the pseudo capacitive reaction because of its synergistic effect of composite structure,which shows higher specific capacity,stability and longer cycle life.

关 键 词：Ni_(2)P@CoP_(3)纳米球 水热技术 核壳结构 超级电容器 

分 类 号：O646[理学—物理化学] TQ152[理学—化学]