Low-temperature synthesis of sea urchin-like Co-Ni oxide on graphene oxide for supercapacitor electrodes
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第20期
论文作者：Xueying Yang Cuili Xiang Yongjin Zou Jing Liang Huanzhi Zhang Erhu Yan Fen Xu Xuebu Hu Qiong Cheng Lixian Sun
文章页码：223 - 230
摘 要：Transition metal oxides are ideal electrode materials used for supercapacitors.However,the synthesis of transition metal oxides suffers from drawbacks such as high reaction temperature and energy consumption.Herein,we report the synthesis of sea urchin-like Co3 O4-NiO composites supported on graphene oxide（GO） using a hydrothermal method followed by calcination with a low temperature（250℃）.The obtained Co3O4-NiO/GO composite demonstrates a high specific capacitance of 883 F g-1 at 1 A g-1.Furthermore,upon coupling with an activated carbon（AC） positive electrode,an asymmetric cell of Co3 O4-NiO/GO//AC exhibits outstanding stability reflected by the high capacitance retention of 82% at a high current density of 10 A g-1.The excellent electrochemical properties of the composite may be attributed to the good synergistic effect of Co3O4 and NiO,as well as the assembly of Co3 O4 and NiO into a sea urchin structure,which results in increased electron conductivity and more exposed electroactive sites leading to the promotion of the Faradaic redox process.
Xueying Yang1，Cuili Xiang1，Yongjin Zou1，Jing Liang1，Huanzhi Zhang1，Erhu Yan1，Fen Xu1，Xuebu Hu2，Qiong Cheng3，Lixian Sun1
1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology2. Chongqing University of Technology, College of Chemistry & Chemical Engineering3. The Fifth Electronic Research Institute of the Ministry of Industry and Information Technology
摘 要：Transition metal oxides are ideal electrode materials used for supercapacitors.However,the synthesis of transition metal oxides suffers from drawbacks such as high reaction temperature and energy consumption.Herein,we report the synthesis of sea urchin-like Co3 O4-NiO composites supported on graphene oxide（GO） using a hydrothermal method followed by calcination with a low temperature（250℃）.The obtained Co3O4-NiO/GO composite demonstrates a high specific capacitance of 883 F g-1 at 1 A g-1.Furthermore,upon coupling with an activated carbon（AC） positive electrode,an asymmetric cell of Co3 O4-NiO/GO//AC exhibits outstanding stability reflected by the high capacitance retention of 82% at a high current density of 10 A g-1.The excellent electrochemical properties of the composite may be attributed to the good synergistic effect of Co3O4 and NiO,as well as the assembly of Co3 O4 and NiO into a sea urchin structure,which results in increased electron conductivity and more exposed electroactive sites leading to the promotion of the Faradaic redox process.
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