Atomically Dispersed Copper–Platinum Dual Sites Alloyed with Palladium Nanorings Catalyze the Hydrogen Evolution Reaction

Abstract

Designing highly active catalysts at an atomic scale is required to drive the hydrogen evolution reaction (HER). Copper-platinum (Cu-Pt) dual sites were alloyed with palladium nanorings (Pd NRs) containing 1.5 atom %P t, using atomically dispersed Cu on ultrathin Pd NRs as seeds.T he ultrafine structure of atomically dispersed Cu-Pt dual sites was confirmed with X-ray absorption fine structure (XAFS) measurements.T he Pd/Cu-Pt NRs exhibit excellent HER properties in acidic solution with an overpotential of only 22.8 mV at ac urrent density of 10 mA cm À2 and ah igh mass current density of 3002 Ag À1(Pd+Pt) at a À0.05 Vpotential.

Ruthenium‐Based Single‐Atom Alloy with High Electrocatalytic Activity for Hydrogen Evolution

“…[17,[19][20][21] Many efforts had been devoted to constructing Rubased heterostructures (e.g., Ru/carbon quantum dots, [22] Ru/C 2 N, [18] RuCo/ nitrogen-doped graphene, [23] fcc-Ru/ C 3 N 4 /C, [17] Ru/nitrogen-doped carbon, [24] Ru/graphene [25] ), which show great advantages on promoting water dissociation by synergistic effect. [23,26,27] meanwhile, the interaction between the solute atoms and matrix can modify their electronic structure, [26,28,29] leading to a suitable adsorption energy for hydrogen. Recently, singleatom alloys (SAAs), which comprise separated solute atoms in metallic matrix, show great potential on circumventing scaling relationships.…”

“…Recently, single‐atom alloys (SAAs), which comprise separated solute atoms in metallic matrix, show great potential on circumventing scaling relationships . meanwhile, the interaction between the solute atoms and matrix can modify their electronic structure, leading to a suitable adsorption energy for hydrogen. Consequently, constructing Ru‐based SAAs opens a new avenue toward high HER performance.…”

Single‐Atom Catalysts for the Hydrogen Evolution Reaction

“…Very recently, SACs for the HER catalysis have been widely explored, such as single Pt, Co, Ni, Fe, V, Mo atoms and single‐atom alloy (e. g., Cu−Pt on Pd) . These catalysts could be divided into two groups, i. e., Pt‐based and non‐Pt‐based SACs.…”

“…A single‐atom alloy is defined as an alloy with a bi/trimetallic structure, in which single atoms of a metal or bimetallic sites are atomically dispersed on the surface of a single crystalline or NP of another metal . The intrinsic activity of the single atoms or the bimetallic sites can be modulated by controlling the electronic,,, geometric,, and ensemble structures of the alloy ,. To date, various single‐atom alloy structures have been reported,,,,, such as Pd−Au,,, Pd−Ag, and Au−Ni .…”

“…However, there are rarely few reports on the HER applications of single‐atom alloys. Until recently, Jiang, Hong, Li and co‐workers reported Cu−Pt dual sites (Figure a) uniformly dispersed on Pd nanorings (denoted as Pd/Cu−Pt NRs) via a two‐step synthesis approach . Of note, some bright dots outside of the ring were observed, which mainly could be ascribed to the noise signal due to the low loading of Pt (1.5 at %) and Cu (4.9 at %).…”