Low-crystalline iron oxide hydroxide nanoparticle anode for high-performance supercapacitors

Abstract Carbon materials are generally preferred as anodes in supercapacitors; however, their low capacitance limits the attained energy density of supercapacitor devices with aqueous electrolytes. Here, we report a low-crystalline iron oxide hydroxide nanoparticle anode with comprehensive electrochemical performance at a wide potential window. The iron oxide hydroxide nanoparticles present capacitances of 1,066 and 716 F g −1 at mass loadings of 1.6 and 9.1 mg cm −2 , respectively, a rate capability with 74.6% of capacitance retention at 30 A g −1 , and cycling stability retaining 91% of capacitance after 10,000 cycles. The performance is attributed to a dominant capacitive charge-storage mechanism. An…

• NN
  National Natural Science Foundation of China

  Awards: 51425204, B17034, 2013CB934103, 51521001, 51502226, 21673171, 51521001, 21673171, 51502226, 2016YFA0202603
• NK
  National Key Research and Development Program of China

  Awards: 2013CB934103, 51521001, 2016YFA0202603, B17034, 51425204
• FR
  Fundamental Research Funds for the Central Universities

  Awards: 2016III002, 2016YFA0202603, 51425204, 51521001, 2013CB934103, 2016III001