Recent advances in transition-metal phosphide electrocatalysts: Synthetic approach, improvement strategies and environmental applications

Scalable Synthesis of NiFe-LDH/Ni9S8/NF Nanosheets by Two-Step Corrosion for Efficient Oxygen Electrocatalysis

https://iopscience.iop.org/article/10.1149/1945-7111/ac330b/pdf

A Novel Trimetal Phosphide with Amorphous Porous Structure for the Enhanced Electrocatalysis of Oxygen Evolution Reaction

Encapsulation of Fe2P-Co2P nanoparticles in N-doped biomass-based carbon and carbon nanotube composite as an efficient oxygen reduction electrocatalyst

Layered double hydroxides (LDHs) are one of the ideal functional materials for the oxygen evolution reaction (OER) because of their special configuration and good electrochemical activity. 

High catalytic performance of nano-flowered Mg-doped NiCo layered double hydroxides for the oxygen evolution reaction

As nonprecious metal catalysts, transition metal phosphides (TMPs) are well known for their hydrogen evolution performance, but their low oxygen evolution reaction activity inhibits their ability to serve as excellent dual-functional catalysts. In this study, a bimetallic phosphide electrocatalyst with nanowire morphology was prepared using a simple and controllable etch-doping strategy with nickel foam (NF) as the carrier of the integrated electrode. The morphology of the catalyst nanowires offers a relatively high specific surface area, thereby providing more active sites and promoting the contact between the electrolyte and the catalyst. Electrochemical tests show that Co1Fe0.1P/NF exhibits excellent performance and stability for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). For the HER, the catalyst needs an overpotential of only 73 mV in 1 M KOH to reach a current density of 10 mA cm-2 and an overpotential of only 257 mV for the OER. It is worth noting that when using Co1Fe0.1P/NF as the cathode and anode for electrolyzing water in the electrolyzer system, a current density of 10 mA cm−2 can be reached with only 1.60 V. This research provides an effective synthesis route for transition metal phosphides as bifunctional catalysts for water electrolysis.

An etch-doping strategy: cobalt–iron bimetallic phosphide as a bifunctional electrocatalyst for highly efficient water splitting

In recent years, the catalyst efficiency of hydrogen evolution reaction (HER) has been extensively studied. However, the stability of catalysts at high current densities is still a challenge. Herein, layered Ni−Co−P was electrodeposited on carbon fiber paper (CFP) via cyclic voltammetry (CV). This low‐cost electrode exhibits high efficiency and excellent durability for HER in 1 M KOH. To achieve current densities of 10, 100, 500, and 1000 mA cm−2, Ni−Co−P/CFP required overpotentials of 49, 95, 170, and 295 mV, respectively. The layered structure allows the catalyst to fall off layer by layer. After the outer layer of catalyst falls off, the inner layer of catalyst will be exposed to continue working. After 300 h of HER at 1000 mA cm−2, Ni−Co−P/CFP still has a regular morphology and high efficiency. Our work shows that layered Ni−Co−P/CFP has excellent prospects for practical applications.

Shanshan Wang

Papers

An etch-doping strategy: cobalt–iron bimetallic phosphide as a bifunctional electrocatalyst for highly efficient water splitting

Layered Ni−Co−P Electrode Synthesized by CV Electrodeposition for Hydrogen Evolution at Large Currents