Interfacial engineering of CeO₂ on NiCoP nanoarrays for efficient electrocatalytic oxygen evolution

Abstract

Transition metal phosphides (TMP)-based oxygen evolution reaction (OER) catalysts constructed by interface engineering strategy have a broad prospect due to their low cost and good performance. Herein, a novel CeO2/NiCoP nanoarray with intimate phosphide (NiCoP)-oxide (CeO2) interface was developed via in situ generation on nickel foam (NF). This structure is conducive to increasing active sites and accelerating charge transfer, and may be conducive to regulating electronic structure and adsorption energy. As expected, optimal 1.4-CeO2/NiCoP/NF delivers a low overpotential of 249 mV at the current density of 10 mA cm−2 with a Tafel slope of 77.2 mV dec−1. CeO2/NiCoP/NF boasts one of the best OER catalytic materials among recently reported phosphides (TMP)-based OER catalysts and composite catalysts involving CeO2. This work provides an effective strategy for the construction of hetero-structure with CeO2 with oxygen vacancies to improve the OER performance of phosphides.

Interface Engineering in CoP/CePO4 Derived from a Prussian Blue Analogue as a Highly Efficient Electrocatalyst for Alkaline Hydrogen Evolution Reaction

“…The semicircular diameter in the Nyquist plot of CoP/CePO 4 was much smaller than those of CoP and CePO 4 , demonstrating that lower R ct (interfacial charge transfer resistance) of CoP/CePO 4 was achieved due to the quick charge transfer between abundant interfaces. The fitting by equivalent circuit diagram further shows the R ct values of 3.16 Ω (CoP/CePO 4 ), 4.16 Ω (CoP) and 305.1 Ω (CePO 4 ), which provides support to the improved catalytic activity of CoP/CePO 4 [46] . The electrochemical surface area (ECSA), which reveals the number of exposed active sites, can be determined by double‐layer capacitance ( C dl ).…”

Recent Advances in Self-Supported Transition-Metal-Based Electrocatalysts for Seawater Oxidation

“…This is mainly attributed to the better electrical conductivity of TMPs, especially the metal-rich phosphides with some metallic properties 75 . In recent years, some strategies, such as heteroatom doping 76,77 , heterostructuring [78][79][80][81] , and vacancy engineering 82,83 , have been proved to be significant effective in promoting the OER performance of self-supported TMPs. Meanwhile, more and more self-supported phosphide-based catalysts with high electrocatalytic activity have been successfully synthesized for seawater OER process [84][85][86][87][88] .…”

3D Porous N and S Co-doped CNT Microspheres with Highly Dispersed CoP Nanoparticles: Toward an Efficient Bifunctional Electrocatalyst for Zn-Air Batteries

“…The hybridization of transition metal compounds and carbon materials is considered as an efficient strategy to improve insufficient OER activities owing to their low price, abundance, and high efficiency. Among the various transition metal compounds, transition metal phosphides (TMPs) have exhibited outstanding electrocatalytic activity with high efficiency for OER [16][17][18][19][20]. P element in TMP can induce modification of electronic structure and optimization of the reactant's adsorption energy, which accelerates catalytic kinetics of OER [21][22][23].…”