Self-driven microstructural evolution of Au@Pd core–shell nanoparticles for greatly enhanced catalytic performance during methanol electrooxidation

Abstract

An Au/Pd mixed shell was formed in Au@Pd core–shell during successive CV cycles for MOR, which can reduce the binding strength of CO on Pd active site and promote the production of ˙OH radicals on exposed Au atoms to accelerate adsorbates oxidation.

Pd/Ni-metal–organic framework-derived porous carbon nanosheets for efficient CO oxidation over a wide pH range

“…Various efforts were dedicated to solving these barriers lied in tailoring the size, shape, and lowering composition of Pd nanocrystals and their supports, thereby reducing the cost of the catalyst. [14][15][16][17][18][19][20][21][22][23] Altering the d-band center of Pd by second metals allows self-production of reactive oxygenated species (i.e., •OH radicals), which accelerate the CO oxidation kinetics and tolerate the adsorption of intermediates. [14][15][16][17][18][19][20][21] For example, Pd nanodendrites enhanced the CO oxidation mass activity (58 mA/mg Pd ) by 1.9 folds than commercial Pd/C.…”

A Highly Active Rh@Pd Nanocube Catalyst for Methanol Electrooxidation

“…The ECSA of Rh/C and Rh@Pd/C was measured by the equation ECSA ¼ Q H /(C Â m), where Q H is the charge for hydrogen desorption, C is the hydrogen adsorption constants (C Rh ¼ 220 μC cm À2 ), [31,40] and m is the mass of Rh on the electrode surface. The ECSA of Pd/C and Rh@Pd/C was measured by the equation ECSA ¼ Q A /(C Â m), where Q A is the charge for the reduction of www.advancedsciencenews.com www.advenergysustres.com palladium oxide, C is the theoretical amount of charge needed to reduce a layer of PdO (C Pd ¼ 220 μC cm À2 ), [41,42] and m is the mass of Pd on the electrode surface. Cyclic voltammetry was performed at a scan rate of 50 mV s À1 in 1 M Ar-saturated KOH electrolyte in the presence or absence of 1 M CH 3 OH.…”

“…[35] In contrast, electrochemically active surface areas (ECSAs) of the Rh/C and Rh@Pd/C catalysts were measured by means of the hydrogen adsorption/desorption methods, [31,40] while the ECSAs of the Pd/C and Rh@Pd/C catalysts were estimated by use of the reduction current of PdO to Pd. [41,42] The calculated ECSAs of the Rh/C and Rh@Pd/C catalysts are 56.20 and 63.29 m 2 g À1 , respectively. The Rh@Pd/C catalyst exhibits much higher specific activity (0.61 mA cm À2 ) at its first peak than the Rh/C catalyst (0.51 mA cm À2 ) (Figure S5a, Supporting Information).…”

Enzyme-Graphene Nanometal biohybrid Architectures as Highly Efficient Multifunctional Catalysts for Cascade Reactions

“…Reported studies in the literature described that mutual interaction between the metals in an alloy of PdCu could modify the electronic properties and resulted to high activity and stability. [54][55] It has also been postulated that the presence of PdO oxide layer is advantageous for the catalytic performance of a PdCu system. Finally in order to evaluate a three-step cascade system, the one-pot cascade was evaluated using G@CALB-Pd(0)NPs-Cu3(PO4)2NPs in the transformation of 1 to benzoquinone (4), combining enzymatic hydrolysis, palladium amino-hydrogenation and copper oxidation (Fig.…”