Capabilities and limitations of rotating disk electrodes versus membrane electrode assemblies in the investigation of electrocatalysts

Ultrasmall, Coating-Free, Pyramidal Platinum Nanoparticles for High Stability Fuel Cell Oxygen Reduction

“…48 This is important as it highlights the fact that MEA conditions are more electrochemically challenging than those usually used to test electrocatalysts, such as RDE. 46 A comparison of the ECSA of the Pt catalysts as the ASTs proceed, obtained by the hydrogen underpotential deposition method, offers evidence of the expected 37,38 corrosion resistance of the py-Pt/C (Figure 4c). While the spherical particles prepared using a similar one-pot method (sp-Pt/C� blue circles) lose ECSA sharply over the first ∼3000 cycles, the py-Pt/C (red triangles) drops much more slowly, consistent with the results from RDE, showing that the physicochemical properties these particles have in common beyond shape (easyto-remove coating, purity, and dispersion on carbon) are not solely responsible for the enhanced stability.…”

Atomic‐Level Design of Active Site on Two‐Dimensional MoS2 toward Efficient Hydrogen Evolution: Experiment, Theory, and Artificial Intelligence Modelling

“…Moreover, the PEMWE systems are rarely applied to the evaluation of catalysts because gram grade catalyst powder is required to manufacture MEA and the process is very time‐consuming. [ 282 ] Besides, the electrochemical test of catalyst usually takes several days, and it also needs to accurately control the gas pressure, flow rate, relative humidity, and temperature during the test. In order to make electrocatalysis studies more practical, a set of standard industrial catalyst evaluation system with high feasibility needs to be established urgently.…”

Kinetic Insights of Proton Exchange Membrane Water Electrolyzer Obtained by Operando Characterization Methods

“…Other groups associated the high frequency arc to the charge transfer processes combined with double layer effects of electrical or ionic conductive materials and oxides in the active layer . We think that the latter interpretation is more reliable because HER is extremely fast with exchange current densities on the order of ∼100 mA/cm 2 of platinum (∼100 mA cm Pt –2 ) at room temperature . Consequently, only small amounts of Pt (∼0.025–0.05 mg Pt cm –2 ) are required to limit the HOR/HER overpotential to only a few millivolts .…”

“…) at room temperature. 37 Consequently, only small amounts of Pt (∼0.025−0.05 mg Pt cm −2 ) are required to limit the HOR/ HER overpotential to only a few millivolts. 38 Meanwhile, according to the de Levie model for porous electrodes, the frequency-dependent resistance can be elucidated in a clearer way by defining a frequency-dependent penetration length in electrode.…”