Preparation of mesoporous microspheres of NiO with high surface area and analysis on their pseudocapacitive behavior

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• 作者：Syed Asad Abbas^a ; ^b ; Kwang-Deog Jung^a ; ^b ; ^{jkdcat@kist.re.kr" class="auth_mail" title="E-mail the corresponding author} ; ^{jkdyym@hanmail.net" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Mesoporous microspheres of NiO ; α-Ni(OH)2 ; Oleylamine method ; hydrothermal method ; Pseudocapacitor
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 March 2016
• 年：2016
• 卷：193
• 期：Complete
• 页码：145-153
• 全文大小：2135 K

文摘

Nickel oxide with a high surface area showing high capacitance is reported here. Mesoporous microspheres (MMS) of 250NiO, 300NiO, 350NiO, 400NiO and 500NiO are synthesized by calcining mesoporous α-Ni(OH)₂ at 250 °C, 300 °C, 350 °C, 400 °C, and 500 °C, respectively. The mesoporous α-Ni(OH)₂ was prepared by a hydrothermal method. 250NiO has the highest specific surface area of 295 m²/g, and a high specific capacitance of 1,140 F g⁻¹ at a current density of 10 A g⁻¹ from galvanostatic discharge measurements. The cyclic voltammetry, galvanostatic discharge measurement and electrochemical impedance analysis exhibited that the pseudocapacitive behavior is more clarified for NiO prepared at higher calcination temperature. Apparently, the high specific capacitance of 250NiO results from the mesoporous pores and high specific surface area enhancing the transportation of ions during the charging and discharging process to store high energy. The power density and energy density of the 250NiO are 2.5 kW kg⁻¹ and 59 W h kg⁻¹ respectively at the current density of 10 A g⁻¹.