High power density and improved H2 evolution reaction on MoO3/Activated carbon composite

Sangeetha, D N and Holla, Sowmya R and Bhat, Ramachandra Badekai and Selvakumar, M (2020) High power density and improved H2 evolution reaction on MoO3/Activated carbon composite. International Journal of Hydrogen Energy, 45. pp. 7801-7812. ISSN 0360-3199

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Abstract

The formation of hexagonal MoO3 (h- MoO3) microrods was favoured at lower pH in the hydrothermal synthesis method. Symmetric and Hybrid supercapacitors were fabricated using h-MoO3/plastic bottle derived activated carbon (PAC) composite in 1 M Na2SO4 aqueous electrolyte. The operating voltage for the aqueous electrolyte was maximized to 1.6 V with this combination. The wide operating voltage led to a maximum specific capacitance of 211 Fg-1, power density of 287 W kg1 and 79% efficiency even at 5000 charge-discharge cycles for the hybrid supercapacitor combination. The combined effect of PAC micropores along with the 1-D rod-shaped h-MoO3, helped in faster charge-transfer, hence increasing the efficiency of supercapacitors. Further, the composites of defective PAC (PDAC) together with the h-MoO3 when tested for hydrogen evolution reactions (HER), provided lesser onset potential and Tafel slope values of 0.23 mV and 93 mVdec1 . There was a change in the structural environment of carbon due to the heteroatom doping and dedoping producing defects in PAC, termed as PDAC. These defects together with the hexagonal microrods of MoO3 provided fast electron transfer towards hydrogen adsorption/desorption hence effectively producing H2

Item Type: Article
Uncontrolled Keywords: Hexagonal-MoO3 Electrochemical impedance Energy-density Power-density
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 25 Jun 2020 10:01
Last Modified: 25 Jun 2020 10:01
URI: http://eprints.manipal.edu/id/eprint/155331

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