Engineering the Metal/Oxide Interface of Pd Nanowire@CuO_x Electrocatalysts for Efficient Alcohol Oxidation Reaction

Abstract

The development of new type electrocatalysts with promising activity and antipoisoning ability is of great importance for electrocatalysis on alcohol oxidation. In this work, Pd nanowire (PdNW)/CuO x heterogeneous catalysts with different types of PdOCu interfaces (Pd/amorphous or crystalline CuO x ) are prepared via a two-step hydrothermal strategy followed by an air plasma treatment. Their interface-dependent performance on methanol and ethanol oxidation reaction (MOR and EOR) is clearly observed. The asprepared PdNW/crystalline CuO x catalyst with 17.2 at% of Cu on the PdNW surface exhibits better MOR and EOR activity and stability, compared with that of PdNW/amorphous CuO x and pristine PdNW catalysts. Significantly, both the cycling tests and the chronoamperometric measurements reveal that the PdNW/crystalline CuO x catalyst yields excellent tolerance toward the possible intermediates including formaldehyde, formic acid, potassium carbonate, and carbon monoxide generated during the MOR process. The detailed analysis of their chemical state reveals that the enhanced activity and antipoison ability of the PdNW/crystalline CuO x catalyst originates from the electron-deficient Pd δ+ active sites which gradually turn into Pd 5 O 4 species during the MOR catalysis. The Pd 5 O 4 species can likely be stabilized by moderate crystalline CuO x decorated on the surface of PdNW due to the strong PdOCu interaction. www.advancedsciencenews.com

Water structure at the multilayers of palladium deposited at nanostructured Au electrodes

“…There is a lot of interest in understanding the catalytic properties of these materials. They were extensively investigated by Feliu and coworkers [2], Kiebler and Kolb [3][4][5][6][7][8], Uasaki et al [9][10], Chen et al [11], and Roudgar and Gross [12][13]. These studies demonstrated that thin film of Pd at Au display interesting catalytic properties.…”

Hybrid palladium nanoparticles and nickel single atom catalysts for efficient electrocatalytic ethanol oxidation

“…Alternatively, it is also possible to eliminate the adsorbed CO intermediates by introducing hydroxide or oxide components, such as Bi(OH) 3 , 12 Ni(OH) 2 , 13 SnO 2 , 6,14 and CuO x . 15 An optimal catalyst to promote the C 1 pathway should enable efficient breaking of C–C bonds and removal of CO intermediates. 16,17 Recently, single-atom catalysts (SACs) have received extensive attention in catalysis due to their unique reaction sites and high reactivity.…”

Porous PdWM (M = Nb, Mo and Ta) Trimetallene for High C1 Selectivity in Alkaline Ethanol Oxidation Reaction

“…[26][27][28][29] Oxophilic groups (such as Bi, Ni, Cu, Sn, CeO 2 , and WO x ) adsorb OH ads , promoting the further oxidation of CO and --CH x species. [30][31][32][33][34] Equally important is weakening the adhesion energy between the toxic species and the catalyst surface. For this purpose, the electron structures of Pd must be regulated.…”