Enhanced electrocatalytic activity and selectivity of glycerol oxidation triggered by nanoalloyed silver–gold nanocages directly grown on gas diffusion electrodes

Abstract

Partial galvanic replacement of silver atoms by those of gold was optimized to fabricate free-standing highly active and selective electrocatalysts for glycerol electrooxidation.

Bromide-Regulated Anisotropic Growth of Desert-Rose-Like Nanostructured Gold onto Carbon Fiber Electrodes as Freestanding Electrocatalysts

“…Table S2 summarizes the performance of nanostructured mono-and bi-metallic catalysts for the electrooxidation of glycerol in basic solutions, which have a peak current density of jp = 20-290 mA cm −2 based on the area of the electrode or jp = 0.2-18 A mgAu −1 , and where metal content is fairly high of 16-500 µgAu cm −2 . 20, 28,[53][54][55][56][57][58] Except for few examples of nanoalloynanoporous AuAg 19 and Pt-PtCo, 53,57 it can, therefore, be deduced that the performance of the asfabricated GDE-Au freestanding material is superior to the relevant activities reported in the literature for gold-, palladium-, and platinum-based electrocatalysts. 20, [54][55][56][58][59][60][61][62] To our knowledge, this is the first time a free-standing electrocatalyst made of desert rose-like nanostructured gold has been obtained directly onto carbon fiber electrode and demonstrate high performance towards the glycerol electrooxidation.…”

“…This is significantly lower than that of the oxygen evolution reaction (OER, higher than 1.4 V vs RHE), so that the oxidation of those organic compounds instead of water at the anode in electrolyzers is expected to significantly lower the input energy. [18][19][20][21] Also, because the anode reaction only occurs in a potential range well below 1 V vs RHE, carbon fiber papers as support in anode were used in organic-fuelled reactors without concern for their oxidation. 18,22 This emerging research direction constitutes a meaningful option to advance the development of an efficient anode to be associated with the electricity-driven half-cell processes of hydrogen evolution reaction (HER), CO2 reduction reaction (CO2RR), and N2 reduction reaction (N2RR) for the production of valuable fuels and chemicals.…”

Progress and Perspectives in Photo‐ and Electrochemical‐Oxidation of Biomass for Sustainable Chemicals and Hydrogen Production

“…while reducing the noble metal content. [154,155] The alloyed 3d metals can also downshift the d-band center of Pt/Pd atoms, resulting in a weaker bonding to the surface intermediates and/or products thus increasing the stability. [92,156,157] Pt alloys based on Ni, Fe, Co, and Cu have all shown remarkable catalytic performances toward glycerol electro-oxidation, with their mass and specific activities 2-7-fold higher than commercial catalysts.…”

“…Presented data were originally reported as follows: PdAuNi nanosponges, [177] Pd-Ru nanocages, [149] Pd-Cu-Pt, [178] PdPt nanowires, [152] PdBi, [179] Pd-CNx/G, [142] PdAg, [163] FeCo@Fe@Pd, [180] PtPdM, [181] PtM nanocubes, [161] PtNi nanorod, [160] PtFe nanowires, [158] PtCo nanowires, [159] PtCu nanoframes, [162] 2D AuCu nanoprisms, [182] Au-P4P/G, [183] AgAu nanocage. [154] oxidation. Further studies showed the interaction of the Bi adatom with the enediol intermediate, driving selectivity toward the most stable isomer dihydroxyacetone (Figure 13).…”

“…A) Mass and B) specific activity different catalysts in alkaline electrolyte (except ALD TiO 2 -Pt/C, which was tested in 0.5 m H 2 SO 4 + 2 m glycerol).The peak potential represents the potential where the electrocatalysts exhibit the highest current density. Presented data were originally reported as follows: PdAuNi nanosponges,[177] Pd-Ru nanocages,[149] Pd-Cu-Pt,[178] PdPt nanowires,[152] PdBi,[179] Pd-CNx/G,[142] PdAg,[163] FeCo@Fe@Pd,[180] PtPdM,[181] PtM nanocubes,[161] PtNi nanorod,[160] PtFe nanowires,[158] PtCo nanowires,[159] PtCu nanoframes,[162] 2D AuCu nanoprisms,[182] Au-P4P/G,[183] AgAu nanocage [154].…”