Unlocking Catalytic Potential: Encasing CoP Nanoparticles within Mesoporous CoFeP Nanocubes for Enhanced Oxygen Evolution Reaction

Abstract

Efficient and durable electrocatalysts fabricated by using nanosized nonprecious-metal-based materials have attracted considerable attention for use in the oxygen evolution reaction (OER). Understanding performance disparities and structure−property relationships of various nonprecious-metalbased nanostructures is crucial for optimizing their applications. Herein, CoP nanoparticles encompassed within a CoFeP shell (named CoP/CoFeP) are fabricated. The mesoporous CoFeP shell enables effective mass transport, affords abundant active sites, and ensures the accessibility of hybrid interfaces between CoP and CoFeP. Therefore, encased CoP/CoFeP nanocubes exhibit excellent OER catalytic activity with an overpotential of 266 mV at a current density of 10 mA cm −2 in alkaline media, superior to reference hollow CoFeP nanocubes and commercial RuO 2 . Experimental characterization and theoretical calculations show that the encased structure of CoP/CoFeP with a rich Fe-doped shell enables electronic interactions between CoP and CoFeP, as well as accelerates structural reconstruction that exposes more active sites, yielding an enhanced OER performance. This study aims to inspire further work on nonpreciousmetal catalysts with tailored nanostructures and electronic properties for the OER.

Unveiling the Reaction Mechanism of Nitrate Reduction to Ammonia Over Cobalt-Based Electrocatalysts

“…Three model materials of CoP, Co, and Co 3 O 4 nanorods with similar morphology and specific surface areas are prepared through thermal treatment of Co­(OH) 2 precursor under the atmosphere of phosphine, hydrogen and air, respectively (Figures S1 and S2). , X-ray diffraction (XRD) patterns, X-ray adsorption near edge structure (XANES) spectra, and Fourier transform extended X-ray absorption fine structure (FT–EXAFS) spectra prove the successful synthesis of CoP, Co, and Co 3 O 4 materials (Figure a–c). − The slight difference between the Co catalyst and Co foil in XANES spectra can be ascribed to the inevitable oxidation of Co and the thickness effects. Then, we identify the structure evolution of as-prepared materials before the NRA test.…”

Constructing Chainmail-Structured CoP/C Nanospheres as Highly Active Anodic Electrocatalysts for Oxygen Evolution Reaction

“…40 Therefore, structural characterizations of the samples 42 Furthermore, the peaks at 128.6 and 129.6 eV are ascribed to metal−P species, whereas the broad peak at 133.1 eV is attributed to oxidized P species (Figure 5e). 43 Therefore, CoP/C has undergone surface reconstruction in the process of electrocatalytic OER.…”

Theoretical Insight into the Origin of Dielectric and Magnetoelectric FeCo Alloy–Metal Fluoride Insulators

“…FeCo alloy and their derivatives play important chemical and industrial roles in a similar way to multimetallic alloys because of their catalytic properties. − While Fe and Co metals have traditionally been used as the catalysts of Fischer–Tropsch synthesis for fabricating fuels and hydrocarbons, FeCo alloy is known to give several advantages that make this synthesis more efficient . In addition to the ferromagnetic property of FeCo alloy, the synergetic effect of Fe and Co coexisting on surfaces is speculated to contribute to the efficiency and selectivity of this synthesis. , Hence, it is reasonable that nanogranular FeCo, which is inherently reactive, is wrapped in a veiled interfacial layer with matrix materials that can bring a degrading or novel factor to devices .…”