A set of redox couple (AcFc and Fe(acac) 3 ) temperature-dependent electrochemical analyses were done and used as catholyte and anolyte in redox flow battery at RT and 0 o C. Total 1.41 V cell voltage was constructed with these redox couples as AcFc redox potential was found to be 0.8 V and Fe(acac) 3 redox potential was -0.61 V. RRDE experiments were performed to calculate diffusion coefficient at both temperatures and found to decrease with the temperature drop. The electrochemical kinetic rate constant (k 0 ) of AcFc was found larger than Fe(acac) 3 but remains similar at both temperatures. NMR spectrum shows no difference in both temperatures for an anolyte and catholyte. Before and after battery experiments NMR data is the same which indicates the stability of both anolyte and catholyte. Overall battery performance at both temperatures was better than ARFBs.