Imaging the strain evolution of a platinum nanoparticle under electrochemical control

Abstract

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Stable Strain State of Single‐Twinned AgPdF Nanoalloys under Formate Oxidation Reaction

“…Previous theoretical calculations about the mechanistic origin of strain fields demonstrate a strong dependence of strain on the morphology of the nanocrystal, mostly independent of size. [25] Thus, the strain distributions of AgPd with twinned boundary is calculated to justify the strain distributions observed in the t-AgPdF during the experiment, and a reasonable agreement is expected between the internal stain states of t-AgPd and t-AgPdF. The t-AgPd(111) surface exhibits more blue areas around the twin boundary in comparison to the AgPd(111) surface, indicating that compressive strain can be concentrated around the twin boundaries.…”

In Situ and Operando X-ray Scattering Methods in Electrochemistry and Electrocatalysis

“…Their study directly maps the adsorbateinduced surface train field initiating at edge and corner sites and propagating toward the facets, thus providing important insights for the design of strain-engineered catalysts. 478 6.2.3. Ir and Ru Oxide Electrodes.…”

“…A carefully positioned nanopipette supplied liquid electrolyte and reference/counter electrodes for high quality, low background diffraction, at the cost of complexity and suboptimal electrochemistry. Atlan et al imaged a more traditional Pt/C catalyst using a flow cell . In both cases, substantial strain evolution on the exposed facets, corners, and edges was observed as a function of potential, attributed to electrolyte adsorption and surface oxidation.…”

“…Comparison of the experimentally reconstructed nanoparticles with DFT or molecular dynamics simulations allowed surface and bulk strain to be more confidently assessed. Furthermore, BCDI of nanoparticle electrocatalysts allowed strain effects on dozens of facets with different surface crystallography to be analyzed simultaneously, , along with edges and corner features which cannot be probed using single crystal approaches. The advent of fourth-generation X-ray synchrotron sources with highly spatially coherent beams and much-increased brightness will improve the spatial resolution and enhance the capability of operando BCDI to bulk and surface structural rearrangements inside smaller nanocrystals, which are relevant for electrocatalysis, and investigate phenomena next to their surface.…”

Length-tunable Pd2Sn@Pt core–shell nanorods for enhanced ethanol electrooxidation with concurrent hydrogen production

“…One common approach to enhancing Pt utilization efficiency is the construction of catalysts in nanoscale dimensions, allowing for control over phase, size and morphology. [36][37][38][39] Another effective strategy is the engineering of core@Pt-shell nanostructures by depositing Pt atoms onto the surface of a secondary material. This approach offers the advantage of reducing Pt usage while simultaneously enhancing EOR performance through the modulation of electronic interactions between the Pt surface and the core materials.…”