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Study on Oxidation State Dependent Electrocatalytic Ability for I − /I 3 − Redox Reaction of Reduced Graphene Oxides
Author(s) -
Yeh MinHsin,
Lin LuYin,
Huang TzuYen,
Chuang HuiMin,
Chu ChihWei,
Ho KuoChuan
Publication year - 2014
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201300321
Subject(s) - graphene , redox , oxide , electrolyte , electrochemistry , electrode , catalysis , inorganic chemistry , auxiliary electrode , materials science , rotating disk electrode , oxidation state , chemistry , analytical chemistry (journal) , nanotechnology , cyclic voltammetry , organic chemistry , metallurgy
The influence of oxidation states on electrocatalytic abilities for I 3 − reduction is discussed for reduced graphene oxide (rGO), which is a promising catalyst of counter electrodes for dye‐sensitized solar cells (DSSCs). The oxidation states of rGO can be controlled via a photothermal reduction process by varying exposure times. The results reveal that the rGO with lower oxidation state shows smaller charge transfer resistance at the electrode/electrolyte interface and better electrocatalytic ability attributed to higher standard heterogeneous rate constant ( k 0 ) and reasonable electrochemical surface area ( A e ) for I 3 − reduction, both are quantitatively determined by a rotating disk electrode system using the KouteckýLevich equation.