Large Au@Pd/PdO_x core–porous shell nanoparticles as efficient ethanol oxidation electrocatalysts

Abstract

In this article, large Au@Pd core-porous shell nanoparticles (NPs) with diameters of between 20 and 60 nm were synthesized by the seed-mediated growth method. Cetyltrimethylammonium chloride, used as a surfactant...

Pd Nanoparticle-Decorated Novel Ternary Bi2O2CO3-Bi2MoO6-CuO Heterojunction for Enhanced Photo-electrocatalytic Ethanol Oxidation

“…The previous literature investigated that the formation of ultrathin layer PdO and PdO/PdO 2 on the Pd metal surface significantly enhances EOR activity in alkali medium. ,, Krittayavathanum et al reported that the deposition of the thin PdO layer on Pd easily binds ethanol and its intermediates, leading to high current density, and the decline in current density with increasing cycling is due to the higher amount of PdO deposition on the Pd surface, activity similar to that of the bulk PdO . Therefore, our observations agree well with the previous results. ,,− …”

“…This infers that CuO favors the formation of PdO and oxygen released by the PdO-to-Pd conversion can oxidize ethanol, and this might be the reason for the initial growth of current density. ,, The small reduction of current density after 500 cycles of CV in visible light is due to the deactivation and poisoning of the catalyst surface. The previous literature investigated that the formation of ultrathin layer PdO and PdO/PdO 2 on the Pd metal surface significantly enhances EOR activity in alkali medium. ,, Krittayavathanum et al reported that the deposition of the thin PdO layer on Pd easily binds ethanol and its intermediates, leading to high current density, and the decline in current density with increasing cycling is due to the higher amount of PdO deposition on the Pd surface, activity similar to that of the bulk PdO . Therefore, our observations agree well with the previous results. ,,− …”

“…The C2 pathway is not effective as the EOR in this route is incomplete (delivering 2 or 4 electrons) and produces acetaldehyde and acetate in alkali. − Therefore, it is crucial to improve an advanced electrocatalyst that is able to disrupt the C–C bond. Recently, one of the most promising technologies to alter solar and chemical energy into electrical energy is photoassisted electrocatalysis of ethanol that utilizes noble metal/semiconductor junctions as the photo-electrocatalyst. − The non-noble metal oxide is inexpensive, helps disperse metal nanoparticles easily, has good stability against dissolution, assists the bifunctional mechanism with oxygenated species, and facilitates the C–C bond cleavage for complete oxidation of ethanol to carbonate in alkali . Indeed, semiconductor metal oxide has the capability of alcohol oxidation under light irradiation through synergistic electro- and photocatalytic processes.…”