Enhanced electrochemical supercapacitance of binder-free nanoporous ternary metal oxides/metal electrode

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:474

Article

Gao, J. J.^1,2  Qiu, H. -J.^1,2  Wen, Y. R.³  Chiang, F. -K.⁴  Wang, Y.^1,2 

[1] Chongqing Univ, State Key Lab Mech Transmiss, Chongqing 400044, Peoples R China

[2] Chongqing Univ, Sch Chem & Chem Engn, Chongqing 400044, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[4] Natl Inst Clean & Low Carbon Energy, Beijing 102209, Peoples R China

关键词: Dealloying;    Binder free;    Potential window;    Supercapacitor;    Volumetric capacitance;   

DOI  :  10.1016/j.jcis.2016.03.028

来源: Elsevier

【 摘 要 】

Free-standing nanoporous Ni-Cu-Mn mixed metal oxides on metal with a high surface area was fabricated by chemically dealloying a Ni8Cu12Mn80 single-phase precursor, followed by electrochemical oxidation in an alkaline solution. Electrochemical analysis shows that first Cu and Mn-based metal oxides formed by the electrochemical oxidation. Ni-based oxides grow later with the increase of electrochemical CV cycles and mix with the Cu/Mn oxides, forming a relatively stable mixed metal oxides thin film on metal ligament network. Due to the different electrochemical properties of each metal and the synergetic effect between them, the mixed ternary metal oxides formed on metal nano-ligament can operate stably between a wide potential window (1.5 V) in 1.0 M KOH aqueous solution when tested as a free-standing supercapacitor electrode. Due to the high volumetric surface area, wide operating potential window and excellent conductivity, the nanoporous metal oxides@metal composite exhibits a high volumetric capacitance (similar to 500 F cm(-3)), high energy density (similar to 38 mW h cm(-3)) and good cycling stability. (C) 2016 Elsevier Inc. All rights reserved.

【 授权许可】

Free