Electrodeposition of Pt Nanoparticle Catalysts from H₂Pt(OH)₆ and Their Application in PEM Fuel Cells

Abstract

We report the electrochemical deposition of Pt nanoparticles from platinic acid H2[Pt(OH)6] using pulse potential deposition (PPD). We are able to control the size, morphology, and loading of platinum nanoparticles from H2[Pt(OH)6] by controlling the deposition parameters such as the pH of the plating solution, the pulse potential, the pulse width, and the duty cycle of the pulse sequence. We show that a high density of Pt nanoparticles electrodeposited can be produced on both planar and nonplanar electrode supports with high surface area and high catalytic activity. Finally, we show that fuel cell electrodes can be produced using H2[Pt(OH)6] as the source of Pt via our optimized PPD technique. The fuel cells produced from these electrodes are highly efficient with less than half the Pt content of commercially available fuel cells, which results in a gravimetric power more than twice that of fuel cells produced by using commercially available electrodes.

Rutile Ti0.9Ir0.1O2‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media

“…Meanwhile, the reverse scan showed the characteristic hydrogen adsorption region which was assigned to the adsorbed H + ions at the catalyst Pt surface followed by H 2 progression. [ 45,46 ] By the adsorption/desorption hydrogen regions, the electrochemically active surface area of the as‐prepared 15.5 wt% Pt/rutile Ti 0.9 Ir 0.1 O 2 and conventional 20 wt% Pt/C electrocatalysts was estimated to be around 55.67 and 70.38 m 2 g Pt −1 , respectively, which could be interpreted due to the low amount of Pt loading (15.5 wt%) on the as‐obtained rutile Ti 0.9 Ir 0.1 O 2 nanosupport.…”

Preparation of platinum-based 'cauliflower microarrays’ for enhanced ammonia gas sensing

“…The shape of these reduction features are more steady-state in shape compared to the typical behavior on macrodisk electrodes [47,48], attributed to the radial diffusion occurring at the microelectrodes in the array. A further reduction process (III) was observed at -0.25 V that corresponds to the evolution of bulk hydrogen [41]. On the reverse scan, the oxidation peak at ca.…”

“…The resulting modified electrodes were named: used. Constant-potential deposition was employed, stepping the potential from the OCP (0.75 V) to the underpotential region at -0.05 V [41], near the start of the second reduction peak, and holding for 300s.…”

“…Initially, on the first cycle (black CV), two reduction features were observed at ~ +0.02 V (peak I) and ~ -0.17 V (peak II), described by the following equations [41,46,47]:…”

Synthesis of spherical copper-platinum nanoparticles by sonoelectrochemistry followed by conversion reaction

“…Other simple ways of producing nanoparticles are classical electrochemistry -under pulsed current [16] or not [17] -and sonoelectrochemistry.…”