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Oxygen‐Ions‐Mediated Pseudocapacitive Charge Storage in Molybdenum Trioxide Nanobelts
Author(s) -
Kumar Vipin,
Wang Xu,
Lee Pooi See
Publication year - 2015
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201500045
Subject(s) - molybdenum trioxide , hydrogen peroxide , electrolyte , materials science , ion , oxygen , tungsten trioxide , inorganic chemistry , molybdenum , superoxide , chemical engineering , chemistry , electrode , organic chemistry , engineering , tungsten , metallurgy , enzyme
Here we demonstrate the effect of the concentration of hydrogen peroxide solution on the generation of various kinds of oxygen ions, mainly peroxide (O 2 2− ) and superoxide (O 2 − ) ions, on the surface of molybdenum trioxide (MoO 3 ) nanobelts. Due to O 2 2− and O 2 − ions, the mechanism of charge storage shows an interplay between surface‐controlled and diffusion‐controlled redox reactions. The concentration of H 2 O 2 is indicative of the strength of hydrogen bonding, which significantly affects the concentration or coordination of the surface species (O 2 − , O 2 2− , Mo 5+ and Mo 6+ ) that are available to interact with the electrolyte ions. By altering the concentration of the surface species ( I O2 − / I O2 2− , I Mo 5+ / I Mo 6+ ), a specific capacitance as high as 210 F g −1 is achieved for MoO 3 nanobelts at an applied current density of 0.5 A g −1 , with relatively good cycling stability (≈85 %) after 2000 cycles.