Catalyst Degradation Mechanisms in PEM and Direct Methanol Fuel Cells

Self-Poisoning during BH4– Oxidation at Pt and Au, and in Situ Poison Removal Procedures for BH4– Fuel Cells

“…Regardless, this is a significant operation time, and clearly demonstrates that the potential-step cleaning procedure is more than just a benchtop phenomenon. Though the 7 h of operation and ∼200 cleaning cycles performed are far short of the 5000 h and 10 000 voltage cycles performed on industrial grade fuel cells, , the operational time is significant enough to warrant further development of the BH 4 – /Cr 2 O 7 2– system.…”

Model-Based Data Driven Approach for Fault Identification in Proton Exchange Membrane Fuel Cell

“…To operate a PEMFC in this electro chemical process, there are many different phenomena [7]. Some of these phenomena are responsible for specific faults in FC, such as improper water management [28], degradation of catalyst [29], fuel starvation at PEMFC anode [30], and contamination of membrane electrode assembly (MEA) [31]. These faults resulted in voltage drop and effect the operating lifetime of an FC.…”

Mesoporous platinum nickel thin films with double gyroid morphology for the oxygen reduction reaction

“…The potential cycling causes alternating surface oxidation/reduction of the catalyst which is particularly vigorous due to the dynamic nature of the surface changes. [27,28] The catalytic ORR activity and the ECSA of DG Pt x Ni catalyst were evaluated initially and immediately following 100, 1,000 and 10,000 accelerated stability test cycles, using the conditions described above. Before every ORR activity and ECSA measurement, the solution was replaced with fresh electrolyte and the sample was cleaned by electrochemical cycling in N 2 -saturated electrolyte from 0.05 to 1.1 V vs RHE at 500 mV/s and 0 rpm to condition the electrode until stable CVs were obtained (typically 20-100 cycles).…”