Direct laser writing of MnO 2 decorated graphene as flexible supercapacitor electrodes
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Direct laser writing of MnO2 decorated graphene as flexible supercapacitor electrodes Chenguang Zhu1,2,3,4 , Xia Dong1,2,3 , Xuesong Mei1,2,3 Kedian Wang1,2,3,* , and Dongmei Zhao4
, Meng Gao1,2,3
,
1
State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, 99 Yanxiang Road, Xi’an 710054, Shaanxi, China 2 Shaanxi Key Laboratory of Intelligent Robots, Xi’an Jiaotong University, 28 West Xianning Road, Xi’an 710049, Shaanxi, China 3 School of Mechanical Engineering, Xi’an Jiaotong University, 28 West Xianning Road, Xi’an 710049, Shaanxi, China 4 Engineering Training Center, Xinjiang University, 1230 Yanan Road, Ürümqi 830047, China
Received: 17 June 2020
ABSTRACT
Accepted: 30 August 2020
Manganese oxides/graphene is an electrode material currently under consideration for use in high-performance supercapacitors (SCs). The conventional, widely used wet chemical methods for preparing MnO2/graphene are tedious and consume large quantities of strong reduction/oxidation reagents. The resulting powder composites require adhesives to form a suitable electrode. In the present study, we report on a method for synthesizing MnO2/graphene composite electrodes using a second laser irradiation employing a laser of the polyether ether ketone. This simple and environmentally friendly method allows the patterning of electrodes together with the synthesis of the active materials. The MnO2/laser-induced graphene (LIG) electrode exhibited a high capacitance of 48.9 mF cm-2, which is about 2.4 times greater than a pure LIG electrode. Assembled all solid micro-supercapacitors (MSCs) containing the novel LIG electrodes delivered both high energy density (3.1 lWh cm-2) and power density (2.5 mW cm-2). These MSCs exhibited a capacitance retention of 94.3% over 3000 cycles, at a current density of 0.5 mA cm-2. The electrochemical performance was almost unaltered by bending the MSC to 150°. This method of synthesizing high-performance flexible electrodes is important for future development of wearable electronics.
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Springer Science+Business
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Handling Editor: Kyle Brinkman.
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https://doi.org/10.1007/s10853-020-05212-2
J Mater Sci
Introduction High-performance SCs are environmentally friendly energy retention devices [1] and offer a range of advantages such rapid charge–discharge rate [2], efficient power density [3], an extended life cycle and increased safety [4]. In particular, in-planar SCs offer significant benefits when used in wearable electronic devices due to their lightweight and flexibility [5]. However, the low energy density of conventional SCs depends largely on the composition and microstructure of their electrodes [6]. SCs can be either electrical double-layer capacitors (EDLC) that retain energy on the electrode–electrolyte interface through ion adsorption, or can be pseudocapacitors, where the active electrode materials store charge as a result of reversible Faraday reactions [7]. Transiti
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