Triarylimidazoles　have　emerged　as　novel　and　useful　organic　redox　catalysts　as　a　result　of　their　straightforward　synthesis　and　tunable　oxidation　potential.　Herein　we　describe　an　investigation　of　the　effects　of　supporting　electrolyte　and　solvent　on　the　chemical　reversibility　of　the　triarylimidazole　redox　couple.　Next,　the　homogeneous　electron　transfer　rate　for　three　triarylimidazole　mediators　toward　the　oxidation　of　4-methoxybenzyl　alcohol　was　estimated　using　cyclic　voltammetry.　The　results　indicate　that　the　concentration　and　composition　of　the　conducting　salts,　especially　of　the　anion,　affect　the　electrochemical　performance　of　the　triarylimidazole.　Kinetic　studies　reveal　that　the　smaller　the　peak　potential　difference　between　a　mediator　and　the　substrate,　the　larger　the　catalytic　current　and　the　pseudo　first-order　homogeneous　rate　constant.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.