Multi-dimensional CuO nanorods supported CoMoO 4 nanosheets heterostructure as binder free and high stable electrode for
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Multi-dimensional CuO nanorods supported CoMoO4 nanosheets heterostructure as binder free and high stable electrode for supercapacitor Feng Liu1 · Yanqin Yang1 · Songzhan Li1,2 · Tian Chen2 · Hao Long3 · Haoning Wang3 · Min Liu1 Received: 3 January 2018 / Accepted: 12 April 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract A two-step synthetic method is developed for the preparation of ternary C oMoO4/CuO heterostructure on Cu foam as binderfree and high-performance supercapacitor electrode. The synthesis approach involves a simple chemical bath deposition and hydrothermal reaction. CuO nanorods are obtained on Cu foam with chemical bath deposition, and C oMoO4 nanosheets are subsequently grown on as-prepared CuO nanorods to form multi-dimensional C oMoO4/CuO heterostructure by the hydrothermal procedure. The in situ grown C oMoO4/CuO heterostructure could be used as a binder-free supercapacitor electrode. The C oMoO4/CuO heterostructure delivers a significant specific capacitance of 1176 F g−1 under the scan rate of 1 mV s−1, which is distinctly higher than that of the bare C oMoO4 electrode. The galvanostatic charge and discharge tests reveal the C oMoO4/CuO heterostructure electrode has excellent cycle stability, maintaining 95.1% capacitance retention under 2.5 A g−1 after 5000 cycles. These superior performances could be original from the unique multi-dimensional CoMoO4/CuO heterostructure which provides more active sites and additional electron transport channels. These results have promoted the potential implementation of multi-dimensional heterostructure for advanced electrochemical capacitors.
1 Introduction High efficient energy storage has been exploiting to cater the endless need of renewable and clean energy in new era. Various storage devices have been researched in the decade, such as batteries [1–3], fuel cells [4, 5], and supercapacitors [6–8]. Currently, supercapacitor is significantly important energy storage device as comparing to batteries and traditional capacitors. Supercapacitor has rapid charging–discharging rate, stable cycling performance, high energy density and low cost [9–11]. The properties of energy storage * Yanqin Yang [email protected] * Songzhan Li [email protected] 1
School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, People’s Republic of China
2
School of Physics and Technology, Wuhan University, Wuhan 430072, People’s Republic of China
3
School of Electronics and Information Engineering, South-Central University for Nationalities, Wuhan 430074, People’s Republic of China
devices principally depend on the electrode materials. The electroactive materials of supercapacitors are always the focus in the energy storage field. Conventional carbonbased materials could lead to high power density at the cost of low energy density, due to the inherent limitation of the electrode/electrolyte interface charging mechanism. Another important type of electrode materials is transition meta
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