Amorphous-crystalline PdRu bimetallene for efficient hydrogen evolution electrocatalysis

Abstract

In this work, PdRu bimetallene is prepared by a wet-chemical method using CO as a structure-directing agent and reductant derived from decomposition of W(CO)6. The PdRu bimetallene exhibits excellent catalytic...

Unveiling the True Micro-Structure in PdRu Immiscible Alloys and Its Application in Alkaline Hydrogen Evolution Reaction

“…Due to the efficient water dissociation activity of Ru and the outstanding hydrogen storage capacity of Pd, Pd-Ru is considered as a promising alkaline HER catalysis. 18,34,35 The synergetic effects of the bimetallic alloys on the catalytic activity rely on the way of mixing of the two metals, which is further determined by the phase diagram and the synthetic protocol. While Ru usually forms hexagonal close-packed (hcp) structure, Pd prefers a face-centered cubic (fcc) structure.…”

Cr-doped Pd metallene nanoribbon superstructures for the oxygen reduction reaction and formic acid oxidation

“…S4a, ESI† shows that the product consisted of irregular polyhedra, and these polyhedra were also observed without visible formation of the 3D metallene nanoribbons when Cr(CO) 6 was replaced with Cr(acac) 3 , as depicted in Fig. S4b, ESI † 8,11.…”

“…Recently, metallene, a new class of two-dimensional (2D) metal material, and a graphene analogue, has aroused extreme research attention in catalysis due to its prominent electronic structure and physical properties, such as low-coordinated atoms, strain effects, high conductivity, quantum size effects and high atom utilization induced by its several atom thickness and highly curved geometry. [7][8][9][10][11][12][13][14] Besides, surface defects like lattice distortion and vacancies on metallene have been shown to promote electrocatalytic activities by inducing charge transfer between Pd and adsorbed reactant molecules. [15][16][17] However, previous studies mainly focused on 2D metallene nanosheets or nanoplates.…”

“…S4b, ESI. † 8,11 Furthermore, the surface defects, crystal phase, and elemental state of the 3D PdCr MNR were analyzed by spherical AC-HRTEM, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), respectively. In addition to the abundant low-coordinated surface atoms, Fig.…”

“…3b), indicating a faster conversion rate of adsorbed oxygen, leading to faster ORR reaction kinetics. 11–13,23 The 3D PdCr MNR/C has the lowest charge transfer resistance (Fig. S9 ESI†), indicating that 3D PdCr MNR/C was more prone to transfer electrons, thus promoting ORR activity.…”