Enhanced electrochemical performance of monoclinic WO3 thin film with redox additive aqueous electrolyte

Pragati A Shinde; Vaibhav C Lokhande; Nilesh R Chodankar; Taeksoo Ji; Jin Hyeok Kim; Chandrakant D Lokhande

doi:10.1016/j.jcis.2016.08.011

Enhanced electrochemical performance of monoclinic WO3 thin film with redox additive aqueous electrolyte

J Colloid Interface Sci. 2016 Dec 1:483:261-267. doi: 10.1016/j.jcis.2016.08.011. Epub 2016 Aug 12.

Authors

Pragati A Shinde¹, Vaibhav C Lokhande², Nilesh R Chodankar¹, Taeksoo Ji², Jin Hyeok Kim³, Chandrakant D Lokhande⁴

Affiliations

¹ Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, MS, India.
² Department of Electronics and Computer Engineering, Chonnam National University, 300 Yongbong-Dong, Puk-Gu, Gwangju 500-757, South Korea.
³ Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-Dong, Puk-Gu, Gwangju 500-757, South Korea. Electronic address: jinhyeok@chonnam.ac.kr.
⁴ Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, MS, India. Electronic address: l_chandrakant@yahoo.com.

PMID: 27565957
DOI: 10.1016/j.jcis.2016.08.011

Abstract

To achieve the highest electrochemical performance for supercapacitor, it is very essential to find out a suitable pair of an active electrode material and an electrolyte. In the present work, a simple approach is employed to enhance the supercapacitor performance of WO3 thin film. The WO3 thin film is prepared by a simple and cost effective chemical bath deposition method and its electrochemical performance is tested in conventional (H2SO4) and redox additive [H2SO4+hydroquinone (HQ)] electrolytes. Two-fold increment in electrochemical performance for WO3 thin film is observed in redox additive aqueous electrolyte compared to conventional electrolyte. WO3 thin film showed maximum specific capacitance of 725Fg(-1), energy density of 25.18Whkg(-1) at current density of 7mAcm(-2) with better cycling stability in redox electrolyte. This strategy provides the versatile way for designing the high performance energy storage devices.

Keywords: Chemical bath deposition; Redox additive aqueous electrolyte; Supercapacitor; Thin film; WO(3).