Mesoporous Co₃O₄ materials obtained from cobalt-citrate complex and their high capacitance behavior

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• 作者：Ru-Tao Wang ; Ling-Bin Kong ; Jun-Wei Lang ; Xiao-Wei Wang ; Shu-Qiong Fan ; Yong-Chun Luo ; Long Kang
• 关键词：Electrochemical capacitors ; Cobalt oxide ; Cobalt&ndash ; citrate complex ; Cobalt hydroxide ; Mesoporous
• 刊名：Journal of Power Sources
• 出版年：2012
• 出版时间：1 November, 2012
• 年：2012
• 卷：217
• 期：Complete
• 页码：358-363
• 全文大小：1483 K

文摘

In this work, amorphous and mesoporous Co₃O₄ material is obtained from the calcination of loosely packed Co₃O₄/Co(OH)₂ nanosheets which are synthesized by the formation and disassociation of cobalt-citrate complex reaction. We propose that Co nanoparticles are completely oxidized to form the stable cobalt-citrate complex in the presence of sodium citrate and oxygen, and cobalt-citrate complex disassociates to Co(OH)₂ under alkaline conditions. The high surface area and mesoporous texture of granular Co₃O₄ materials are the consequence of the energetically favored topotactic transformation aspect in the solid-state oxidative reaction. Furthermore, mesoporous Co₃O₄ material exhibits excellent electrochemical capacitance prosperities, well retention to the discharging capacity in cycle lifetime, and a high specific capacitance of 427?F?g^?1, indicating its potential application in electrochemical capacitors and further in energy and environmental applications.