Multiple Twin Boundary‐Regulated Metastable Pd for Ethanol Oxidation Reaction

Abstract

Abundant surface structural defects can endow electrocatalysts with extraordinary physical and chemical characteristics. Herein, metastable Pd nanoparticles (NPs) with abundant twin boundaries (TBs) and atomic steps (ASs) anchored on a carbon substrate (TS‐Pd/C) are directly synthesized by a solid‐state thermal shock (TS) strategy. Molecular dynamics simulation indicates that the transient super cooling procedure after the TS synthesis can boost the formation of TBs. Benefitting from the abundant TBs and ASs, these metastable Pd NPs can serve as an advanced electrocatalyst for the ethanol oxidation reaction (EOR) with superior reactivity, stability, and CO tolerance in alkaline solutions, which far exceeds that of commercial Pd/C. The first‐principles calculations suggest that the defect structure dominated by TBs can achieve the spatial separation of the optimal adsorption sites for CO and OH. The CO can concentrate at optimal surface sites to minimize the number of poisoned active sites. The strong adsorption of OH can accelerate the EOR process and jointly promote the improvement of electrocatalytic reactivity.

Ultrafast Porous Carbon Activation Promises High‐Energy Density Supercapacitors

“…[58,59] The HTS process can manufacture APCs with high specific surface area and dense and small pores. During the HTS-KOH activation process, the KOH fully activates the coconut shell feedstock, while producing a large number of gases such as CO 2 , which reinforces the vacancy defect effect, [60] porous carbon structures with high pore richness, high specific surface area and stable structure. These ideal structure features resulted in excellent performance of the HTS-APC comparing with those prepared by traditional methods as demonstrated by the high energy density of 25 Wh kg −1 of the HTS-APC-based supercapacitor in the EMIMBF 4 ionic liquid (0-3.5 V).…”

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

“…4–6 Pd-based nanoparticles exhibit a comparable electrocatalytic activity towards the EOR in alkaline media; however, their performance towards the EOR still needs to be further enhanced. 7–11 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.…”

l-Lysine derived fabrication of Cu@Ni core–satellite nanoassemblies as efficient non-Pt catalysts for the methanol oxidation reaction

“…1g and h highlight the crystal distortions and edge atoms in Cu@Ni CS-NAs, which could work as catalytically active sites due to their coordinative unsaturation. 39,40 As observed from the junctions between the adjacent core particle and small satellites, cyclic lattice stretching with the same orientations was found, indicating the highly oriented attachment of satellite particles along the core surface (Fig. 1i).…”