Simple Synthesis of PdAg Porous Nanowires as Effective Catalysts for Polyol Oxidation Reaction

Abstract

The development of efficient and stable Pd-based electrocatalysts is extremely important to facilitate the development of catalysts for polyol oxidation reactions. To synthesize Pd-based catalysts with excellent catalytic performance, a series of PdAg porous nanowires (PdAg PNWs) with different elemental ratios was constructed by facile synthesis using a seed-mediated method. The synthesized PdAg PNWs have a rough surface and a porous one-dimensional structure, which optimize the specific surface area and surface area of catalysts, thereby providing more active sites for catalysts. PdAg PNWs benefited from the geometric effect of porous nanowires and the synergy between Pd and Ag, showing excellent catalysis (8243.0 and 4137.0 mA mgPd –1) for the ethylene glycol oxidation reaction (EGOR) and glycerol oxidation reaction (GOR). Among them, the optimal Pd62Ag38 PNWs show the highest catalytic activity (6.0 times and 3.9 times higher than Pd/C) and stability compared with Pd57Ag43 PNWs, Pd51Ag49 PNWs, and Pd/C for EGOR and GOR. At the same time, this porous one-dimensional structure also endows PdAg PNWs with faster electron transfer capabilities than Pd/C. This work will likely provide an effective strategy for constructing cost-effective catalysts.

Recent progress on the synthesis of metal alloy nanowires as electrocatalysts

“…PdCu–SnO 2 nanowires could be formed by direct galvanic replacement between Na 2 PdCl 4 and the Cu–SnO 2 nanowires, 163 while the porous PdAg nanowires need the presence of ascorbic acid in the galvanic replacement process between the Ag nanowires and Pd precursors at 80 °C. 164 An opposite case is the formation of PtCu nanowires via the post-synthetic alloying of Cu nanowires. The Cu nanowires can directly react with H 2 PtCl 4 .…”

Mechanistic Investigations of Electrochemical Ethanol Oxidation Reaction by In Situ Raman Spectroscopy

“…[10,25] Owing to limited resources and elevated prices, current research on PGMbased catalysts predominantly aims at reducing PGM loadings and enhancing the specific activity of the catalysts. To achieve this, alloying PGM with other elements such as Co, [26] Ag, [27] and Zn, [28] among others, has been identified as an effective strategy to bolster catalytic performance, attributed to the so-called synergistic effect. [29,30] Moreover, morphological engineering has also emerged as a potent approach to augment the exposure of active sites, thereby enhancing the overall performance of EOR catalysts.…”

Tuning the selectivity of benzene hydroalkylation over PdZn/HBeta catalysts: identification of lattice contraction and electronic properties

“…The construction of the asymmetric adsorption activation of benzene on electron-rich metal surfaces is conducive to the formation and desorption of CHE. 12,13 Compared with monometallic Pd catalysts, doping Pd with transition metals offers more possibilities for improving the catalytic performance since the geometric, 14 electronic, 15 or synergy effects 16 of the active sites can be modified with greater flexibility. [17][18][19][20] The variation trend of the lattice distance and electronic charge states of the surface Pd atoms have a significant impact on the shift in the d-band center position and the density of states for d-band near the Fermi level, which results in a milder/stronger interaction with an adsorbate on this surface, thus finally optimizing the catalytic performance.…”