Unveiling the Roles of Lattice Strain and Descriptor Species on Pt-Like Oxygen Reduction Activity in Pd–Bi Catalysts

Abstract

A facile non-template-assisted mechanical ball milling technique was employed to generate a PdBi alloy catalyst. The induced lattice strain upon the milling time caused a shift of the d-band center, thereby enhancing the oxygen reduction reaction (ORR) catalytic activity. Additionally, the Pd–O reduction potential and adsorbed OH coverage used as descriptors stipulated the cause of the enhanced ORR activity upon the increased milling interval. Redox properties of surface Pd are directly correlated with a positive shift in the Pd–O reduction potential and OH surface coverage. Hence, by deconvoluting the lattice strain and the role of the descriptor species we achieved a catalyst system with a specific activity 5.4× higher than that of commercial Pt/C, as well as an improved durability. The experimental observation is well-corroborated by a theoretical simulation done by inducing strain to the system externally.

Tensile‐Strained Palladium Nanosheets for Synthetic Catalytic Therapy and Phototherapy

“…The similar effect of lattice strain on the XANES of Pd was also reported recently. [29] Reportedly, Pd NSs enclosed by inactive (111) planes showed low PDT efficiency by activation of O 2 to 1 O 2 under NIR light irradiation. [30] Lattice strain altered the electronic structure of Pd NS surfaces, which may favor the catalytic performance.…”

Lattice-strain and Lewis acid sites synergistically promoted nitrate electroreduction to ammonia over PdBP nanothorn arrays

“…The lattice expansion observed from XRD analysis is in good agreement with HRTEM observations, further conrming the B,P-doping induced strain effect. 47,48 The surface electronic properties of PdBP NAs/NF and Pd NAs/NF were acquired through XPS analysis. In the Pd 3d high-resolution XPS spectrum of PdBP NAs/NF (Fig.…”

Implementing the donor–acceptor approach in electronically conducting copolymersviaelectropolymerization

“…As the potential is swept in the positive direction, the oxidation potential onset, 15 E (ox,onset) , at which anodic current begins to appear, corresponds to the potential of the highest occupied molecular orbital (HOMO) level since the latter corresponds to the minimum energy required to remove an electron from the polymer. As the potential is swept in the negative direction, the reduction potential onset, 16 E (red,onset) , at which cathodic current begins to appear, corresponds to the potential of the lowest unoccupied molecular orbital (LUMO) level as the LUMO level is implicated by the minimum energy required to add an electron to the polymer. This is shown in Fig.…”