Controlled Growth of Pt Nanowires on Carbon Nanospheres and Their Enhanced Performance as Electrocatalysts in PEM Fuel Cells

Abstract

International audienc

TiSi2Ox Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

“…In addition, this shift in Pt oxide reduction peak is visible between Pt nanowires and Pt nanoparticles with similar diameters. 23,54,56 Although the origin of this particle size effect still remains unclear, this shift observed in CV can be correlated to the difference in the morphology of Pt nanoparticles on the composite nanostructures observed in HRTEM images in Figure 5. Furthermore, the differences in features observed in the hydrogen adsorption and desorption region of CV curves of the electrocatalysts originates from the differences in the morphology of Pt nanostructures deposited on the supports.…”

Importance of balancing membrane and electrode water in anion exchange membrane fuel cells

“…The typical startup procedure for AEMFCs is simple and comparable to PEMFCs [8,28,29], where a constant cell discharge voltage is controlled for a set time [12,30]. In AEMFCs, the startup procedure does two things: (1) similar to PEMFCs, hydration and formation of ion transport domains throughout the membrane; and (2) allows for the purging of (bi)carbonate (CO 3 2À and HCO 3 À )…”

Ultrathin platinum nanowires grown on single-layered nickel hydroxide with high hydrogen evolution activity

“…Unlike previous reports involving utilization of Pt electrodes 8,[19][20][21][22] , the selection of single-layered 2D Ni(OH) 2 (SL-Ni(OH) 2 ) nanosheets as the substrates is based on cost considerations 28,29 , as SL-Ni(OH) 2 sheets might be cheaply acquired via exfoliation of lamellar a-Ni(OH) 2 (refs 30-33). Furthermore, compared with commonly used zero-dimensional (0D) Pt nanoparticles (NPs), 1D ultrathin Pt NWs of high aspect ratios, few lattice boundaries and smooth crystal planes offer the opportunity for improvement of the catalytic activity [34][35][36][37][38][39][40][41][42][43][44] . Meanwhile, a large contact area between Pt NWs and the Ni(OH) 2 substrates can effectively alleviate possible migration and aggregation of Pt NWs and thus benefit enhancement of the catalytic stability 40 .…”