Carbon-Encapsulated Co₃O₄@CoO@Co Nanocomposites for Multifunctional Applications in Enhanced Long-life Lithium Storage, Supercapacitor and Oxygen Evolution Reaction

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• 作者：Dongyang Xu^a ; Congpu Mu^b ; Jianyong Xiang^a ; ^{jyxiang@ysu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Fusheng Wen^a ; ^{wenfsh03@126.com" class="auth_mail" title="E-mail the corresponding author} ; Can Su^a ; Chunxue Hao^a ; Wentao Hu^a ; Yongfu Tang^c ; Zhongyuan Liu^a ; ^{liuzy0319@yahoo.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：LIBs ; Supercapacitors ; OER ; Co3O4
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：220
• 期：Complete
• 页码：322-330
• 全文大小：3528 K

文摘

Porous nanostructure composites materials had attracted widely attention due to their potential application in energy storage (Lithium ion batteries (LIBs) and supercapacitor) and electrocatalyst of oxygen evolution reaction (OER). Co₃O₄@CoO@Co@C nanocomposites had been successfully synthesized using glucose as carbon source and cobalt nitrate as metalprecurs or of Co₃O₄@CoO@Co@C, which has excellent electrochemical performance for LIBs, supercapacitor and OER. Three kinds of morphology samples marked by Co₃O₄@CoO@Co@C-2/1, Co₃O₄@CoO@Co@C-1/1 and Co₃O₄@CoO@Co@C-1/2 are synthesized due to different atomic ratio of cobalt/carbon in precursors. Electrochemical and catalytic performance of Co₃O₄@CoO@Co@C-2/1 nanocomposites is more excellent than Co₃O₄@CoO@Co@C-1/1 and Co₃O₄@CoO@Co@C-1/2. Co₃O₄@CoO@Co@C-2/1 shows that discharge capacity can maintain 450 mA h g⁻¹ and coulombic efficiency is nearly 100% during 500 cycles for LIBs. It indicates the excellent cycling stability of Co₃O₄@CoO@Co@C-2/1 as electrode for supercapacitor that about 78.3% of initial specific capacitance can be retained after 10000 cycles at current density of 2 A g⁻¹. Co₃O₄@CoO@Co@C-2/1 as catalyst of OER shows excellent electrochemical durability over 15 hours continuous experiment.