摘要
通过水热-煅烧两步法制备了系列镍钴氧化物(NCO)纳米片。通过改变前驱体溶液中的镍、钴离子物质的量之比,进而调控NCO纳米片中的过渡金属离子比例。NCO纳米片的晶相、形貌和结构利用X射线衍射、扫描电子显微镜和X射线光电子能谱表征。此外,对NCO纳米片的电化学性能进行测试。结果表明,NCO-2(Ni_(1.95)Co_(1)O_(x))纳米片在0.5 A·g^(-1)电流密度下,比电容为1096.88 F·g^(-1),且经过5000次循环后具有78.26%的循环稳定性。以NCO-2为正极、活性碳为负极构成的非对称超级电容器,在功率密度为576 W·kg^(-1)时,能量密度为57.70 Wh·kg^(-1)。
A series of nickel and cobalt oxide(NCO)nanosheets were synthesized through a two-step hydrothermal-calcined method.Transition metal ions in NCO nanosheets were adjusted by changing the molar ratios of nickel and cobalt ions in precursor solutions.The crystalline phases,morphologies,and structures of the NCO nanosheets were characterized using X-ray diffraction,scanning electron microscope,and X-ray photoelectron spectroscopy.Further-more,the electrochemical performances of the NCO nanosheets electrodes were tested.The result indicated that the NCO-2(Ni_(1.95)Co_(1)O_(x))nanosheets exhibited high specific capacitance of 1096.88 F·g^(-1)under 0.5 A·g^(-1),which con-currently possessed a cycling ability of 78.26%after 5000 cycles.Importantly,the asymmetric supercapacitor,which was constructed from the NCO-2 positive electrode and active carbon negative electrode,presented an energy density of 57.70 Wh·kg^(-1)at a power density of 576 W·kg^(-1).
作者
张瑶
王春梅
孙鑫垚
高媛媛
高艳芳
ZHANG Yao;WANG Chun-Mei;SUN Xin-Yao;GAO Yuan-Yuan;GAO Yan-Fang(College of Chemical Technology,Inner Mongolia University of Technology,Hohhot 010050,China;Engineering Research Center of Large Energy Storage Technology,Ministry of Education,Inner Mongolia University of Technology,Hohhot 010050,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2023年第12期2415-2424,共10页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金项目(No.22165021)
内蒙古自治区教育厅项目(No.NJZY20071)
内蒙古自然科学基金项目(No.2019BS02012)资助。
关键词
双金属离子
镍钴氧化物
纳米片
赝电容特性
非对称超级电容
dual-metal ions
nickel and cobalt oxide
nanosheet
pseudocapacitive performance
asymmetric superca
