The current Polymer Electrolyte Membrane Fuel Cell (PEMFC) research status indicates that it will be playing a very crucial role in imminent revolutions in automotive and renewable-energy industries. However, the residual issue of electrocatalyst cost in PEMFC continues and has motivat-ed the scientist in the labs, worldwide, for a focused re-search on its development. Nano-sized platinum particles dispersed on high surface area carbon substrates have been used as the electrocatalyst for both the anode and the cathode. Because a sluggish oxygen reduction reaction (ORR) causes a large overpotential at the low operating temperature, the development of a high-performance cathode catalyst is very important. The laboratory-scale electrocatalyst is typically synthesized in extremely small quantities of tens of micrograms and demand rapid screen-ing for ORR activity prior to scale-up and subsequent in situ evaluation in low-temperature fuel cells. 1,2 The electro-chemical characterization using thin film rotating disk elec-trode (TF-RDE) technique has proven a high-throughput research platform for evaluation of ORR activity. The sci-entific community has been engaged in the standardization of TF-RDE technique with elaborative research on various parameters involved in the technique which can affect the estimation of “true” electrocatalysis performance parame-ters such as electrochemical surface area (ESA), surface specific activity (SSA) and mass specific activity (MSA). 1,3-7 It is expected that following these standardized proto-cols for TF-RDE experiments, one can fairly produce trustworthy and reproducible data that allows the compari-son of data from different laboratories.