Fabrication of WO3·2H2O/BC Hybrids by the Radiation Method for Enhanced Performance Supercapacitors

Fan Yang; Jinzhi Jia; Rui Mi; Xichuan Liu; Zhibing Fu; Chaoyang Wang; Xudong Liu; Yongjian Tang

doi:10.3389/fchem.2018.00290

Fabrication of WO₃·2H₂O/BC Hybrids by the Radiation Method for Enhanced Performance Supercapacitors

Front Chem. 2018 Aug 13:6:290. doi: 10.3389/fchem.2018.00290. eCollection 2018.

Authors

Fan Yang¹, Jinzhi Jia^{1

2}, Rui Mi¹, Xichuan Liu¹, Zhibing Fu¹, Chaoyang Wang¹, Xudong Liu^{1

3}, Yongjian Tang¹

Affiliations

¹ Science and Technology on Plasma Physics Laboratory, Research Centre of Laser Fusion, China Academy of Engineering Physics, Mianyang, China.
² School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, China.
³ College of Materials Science and Engineering, Chongqing University, Chongqing, China.

Abstract

In this study, we described a facile process for the fabrication of tungsten oxide dihydrate/bamboo charcoal hybrids (WO₃·2H₂O/BC) by the γ-irradiation method. The structural, morphological, and electrochemical properties of WO₃·2H₂O/BC hybrids were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques. The combination of BC (electrical double layer charge) and WO₃·2H₂O (pseudocapacitance) created a combined effect, which enhanced the specific capacitance and superior cyclic stability of the WO₃·2H₂O/BC hybrid electrode. The WO₃·2H₂O/BC hybrids showed the higher specific capacitance (391 F g^-1 at 0.5 A g^-1 over the voltage range from -1 to 0 V), compared with BC (108 F g^-1) in 6 M KOH solution. Furthermore, the hybrid electrode showed superior long-term performance with 82% capacitance retention even after 10,000 cycles. The experimental results demonstrated that the high performance of WO₃·2H₂O/BC hybrids could be a potential electrode material for supercapacitors.

Keywords: WO3·2H2O/BC hybrids; cyclic stability; higher specific capacitance; supercapacitors; γ-irradiation method.