Iron-Doped NiCoP Porous Nanosheet Arrays as a Highly Efficient Electrocatalyst for Oxygen Evolution Reaction

Abstract

There is a great challenge to employ an electrocatalyst that has high efficiency, is earth-abundant, and is a non-noble metal for oxygen evolution reaction (OER). Herein, we reported a low-cost and highly efficient OER catalyst, Fe-doped NiCoP nanosheet arrays in situ grown on nickel foam (NiCoFeP/NF), which was synthesized via a simple and mild hydrothermal and phosphorization method. In 1 M KOH solution, the as-prepared NiCoFeP/NF produces a larger current density of 200 mA·cm–2 at a low overpotential of 271 mV and exhibits a low Tafel slope of 45 mV·dec–1, which is superior to commercial RuO2. The outstanding OER performance of the as-prepared NiCoFeP/NF can be attributed to the synergetic effects among Fe, Ni, and Co elements, unique nanosheet arrays structure, and the great intrinsic electrocatalytic activity. On the basis of the above factors, the as-prepared NiCoFeP/NF may work as a promising OER electrocatalyst.

A membrane-free flow electrolyzer operating at high current density using earth-abundant catalysts for water splitting

“…15a. The peaks at 707.2 and 720.1 eV of the fresh sample correspond to the formation of phosphide 49,50 . They disappeared completely after the reaction, plausibly due to the oxidation and the subsequent formation of iron oxide and hydroxide.…”

Recent developments in metal phosphide and sulfide electrocatalysts for oxygen evolution reaction

“…For four electrons water oxidation reaction, a catalyst containing multiple redox-active metal ions can buffer the multi-electron transfer processes necessary for OER [86]. Metal doping seems as an effective strategy to achieve the purpose that multiple redox-active metal ions exist in the OER catalysts [85,[87][88][89][90][91][92][93][94][95]. Li and co-workers [89] successfully synthesized the homogeneous ternary Fe2−xMnxP nanorods with control of Mn incorporation (0 ≤ x ≤ 0.9) from the solution-phase reaction of manganese and iron carbonyl complexes with trioctylphosphine.…”

Bifunctional Electrocatalysts Based on Mo-Doped NiCoP Nanosheet Arrays for Overall Water Splitting

“…On the other hand, the element doping is a promising strategy to essentially improve the intrinsic activity of active sites, which could modify the electronic structure and accelerate the reaction kinetics [23,24]. For example, O, Fe, and carbon dot-doped NiCoP have been fabricated, which showed enhanced electrocatalytic performances [25][26][27]. According to the reported research [28], Mo-based phosphides show the best HER performances among various binary phosphides.…”