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

Article scientifique 2017 Anglais

Résumé

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 aqueous hybrid supercapacitor based on the iron oxide hydroxide anode shows stability during float voltage test for 450 h and an energy density of 104 Wh kg −1 at a power density of 1.27 kW kg −1 . A packaged device delivers gravimetric and volumetric energy densities of 33.14 Wh kg −1 and 17.24 Wh l −1 , respectively.

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Owusu, K., Qu, L., Li, J., Wang, Z., Zhao, K., Yang, C., Hercule, K., Lin, C., Shi, C., Wei, Q., Zhou, L., Mai, L. (2017). Low-crystalline iron oxide hydroxide nanoparticle anode for high-performance supercapacitors. https://doi.org/10.1038/ncomms14264

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Auteur(s)

Kwadwo Asare Owusu Longbing Qu Jiantao Li Zhaoyang Wang Kangning Zhao Chao Yang Kalele Mulonda Hercule Chao Lin Changwei Shi Qiulong Wei Liang Zhou Liqiang Mai

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