Pt-Decorated highly porous flower-like Ni particles with high mass activity for ammonia electro-oxidation

Abstract

Pt-Decorated highly porous flower-like Ni particles with nanopores and well-dispersed small Pt grains on petals show high activity for ammonia electro-oxidation.

High Mass and Specific Activity for Ammonia Electro‐oxidation through Optimization of Dispersion Degree and Particle Size of Pt‐Ir Nanoparticles over N‐Doped Reductive Graphene Oxide

“…Recently, a considerable effort has been devoted to developing high‐performance Pt‐based electrocatalysts that are able to effectively enhance ammonia electro‐oxidation kinetics, and simultaneously, significantly decreasing Pt loading through applying Pt‐based bimetallic nanoparticles, constructing special structure or morphology, and dispersing nanoparticles on the appropriate substrate ,,. In general, alloying Pt with other metals causes a series of geometric and electronic effects resulting in the enhancement of electrocatalytic activity of Pt . So far, Ir, one of 5d noble transition metals, is the most studied element for alloying to Pt.…”

“…This can be accomplished by decreasing the particle size to increase ECSA and the surface‐to‐volume ratio ,,,. In addition to decreasing particle size, constructing the unique surface structure and morphology is another effective route to improve the MA of Pt‐based electrocatalysts ,. Liu et al .…”

Palladium Particles Modified by Mixed-Frequency Square-Wave Potential Treatment to Enhance Electrocatalytic Performance for Formic Acid Oxidation

“…Subsequently, controlled by the diffusion process, there is a gradual decay of current density owing to the consumed electroactive species near the electrode surface. [36]. When the test time reaches 1000 s, the current densities of Pds-Mixed and Pds-90 Hz are 0.24 A mg −1 , 0.20 A mg −1 , respectively, which are much higher than that of other samples The oxidation current densities of Pds-Mixed and Pds-90 Hz decreases to 18% and 19% of their initial value, which are also higher than other samples (about 2-7%).…”

“…From the enlarged-scale image of the curve, it can be seen that the initial potential shows drastic change which may be related to the nucleation process at first. Following the rapid change, the curve features a stable current plateau with a voltage of approximately 0.06 V (vs. mercury sulfate electrode (MSE)), which corresponds to the growth process [35,36]. It is known that the whole electrodeposition progress is controlled by both the mass transfer of Pd 2+ ions from the bulk solution toward the electrode (diffusion process) and the reduction reaction on the electrode (activation process).…”

Pt Monolayers on Electrodeposited Nanoparticles of Different Compositions for Ammonia Electro-Oxidation

“…Growing concern in energy and environmental issues has stimulated considerable research on the electro-oxidation of ammonia, since it addresses both clean energy supply and removal of pollutants [1][2][3][4][5][6]. Ammonia is a carbon-free chemical energy carrier, which has a high capacity of hydrogen storage (17.7 wt.%) and high energy density (3000 Wh kg −1 ) [1,7].…”