Pd Nanoparticles Coupled to NiMoO₄–C Nanorods for Enhanced Electrocatalytic Ethanol Oxidation

Abstract

The interfacial interaction including chemical bonding or electron transfer and even physisorption in composite electrocatalysts has a considerable effect on electrocatalytic oxidation reaction. Herein, we report a tremendously enhanced catalytic activity and excellent durability for the ethanol electro-oxidation reaction in NiMoO4–C-supported Pd composites (Pd/NiMoO4–C) compared to the commercial Pd/C (10%) catalyst. The X-ray powder diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy measurements disclose that the strong electron transfer between NiMoO4 nanorods and Pd nanoparticles likely induces the formation of more electrochemical active centers and improves the adsorption–desorption capacity of reactants and corresponding intermediates. In addition, the Pd/NiMoO4–C composite exhibits superior specific activity for ethanol oxidation compared to the Pd/NiMoO4 catalyst with physically incorporated carbon black, which further reveals that the stronger anchoring effect between Pd and C and higher electrical conductivity in Pd/NiMoO4–C composites are also conducive to promote the ethanol oxidation reaction. These discoveries provide an effective and simple method for the design of advanced electrocatalysts and provide more insights into optimizing the electronic interaction between the catalyst and support in general.

Facile synthesis of PdSn alloy octopods through the Stranski–Krastanov growth mechanism as electrocatalysts towards the ethanol oxidation reaction

“…[4][5][6] Pdbased nanoparticles exhibit a comparable electrocatalytic activity towards the EOR in alkaline media; however, their performance towards the EOR still needs to be further enhanced. [7][8][9][10][11] Recently, tremendous efforts have been devoted to tuning Pd-based nanocrystals, 12,13 one of them is to alloy Pd with a secondary component such as Ru, 14,15 Ag, 16,17 Cu, 18,19 Bi, 20,21 Sn, 22,23 and Pb. 24 This secondary metal not only modifies the electronic structure of Pd and subsequently weakens the adsorption of poisonous species, but also brings a bifunctional mechanism.…”

CoFe-Layered Double Hydroxide Coupled with Pd Particles for Electrocatalytic Ethanol Oxidation

“…This stabilizing not only guaranteed the formation of Pd nanoparticles with uniform particle size and high dispersion but also provided strong metal–support interactions at the interfaces between Pd nanoparticles and Co 1 Fe 3 -LDH nanosheets. These configurations in Pd/Co 1 Fe 3 –LDH/NF could efficiently optimize the surface chemical characteristics to enhance the adsorption–desorption capacity of reactants, promote the mass/electron transport, increase the oxidation of poisonous CO ads species, and improve the long-term stability during the EOR process …”

“…increase the oxidation of poisonous CO ads species, and improve the long-term stability during the EOR process. 38 To further evaluate the changes in the electronic structure and valence states, XAS was utilized. In Co L-edge spectra (Figure S15a), the two broad peaks for Co 1 Fe 3 −LDH/NF slightly shifted compared with those of Pd/Co 1 Fe 3 −LDH/NF; meanwhile, the Fe L-edge spectra showed no obvious shift compared with the Co L-edge spectra (Figure S15b), further suggesting that the loading of Pd has a stronger effect on Co than that on Fe.…”

Helical PdPtAu nanowires bounded with high-index facets selectively switch the pathway of ethanol electrooxidation

“…Besides, the catalytic activity of Pd 14 Pt 5 Au 2 NWs is higher than those of Pd-based electrocatalysts reported in the literature (as shown in Table S4 †). 4,[34][35][36][37][38][39][40][41][42][43] The mass activities of Pd 14 Pt 5 and Pd 14 Pt 5 Au 2 NWs are estimated to be 230 and 330 A g Pd+Pt+Au À1 , respectively (see…”