MOF-Derived Iron–Cobalt Bimetallic Selenides for Water Electrolysis with High-Efficiency Oxygen Evolution Reaction

Abstract

Highly active and stable oxygen evolution reaction (OER) electrocatalysts for water electrolysis are currently in high demand. Herein, a rationally designed three-dimensional (3D) CoFe selenide porous array (Fe−CoSe PA) is synthesized through ion exchange from zeolitic imidazolate framework-L (ZIF-L) nanoarray, followed by a facile selenization under hydrothermal conditions for OER electrocatalysis. During the OER process, the surface of Fe−CoSe PA is rapidly oxidized to CoFe oxides/hydroxides, which prevents the inner layer from being oxidized. Benefiting from the high porosity, abundant active sites, and the high conductivity of inner Fe−CoSe, Fe−CoSe PA exhibits excellent OER performance, with an overpotential of 285 mV at a current density of 10 mA cm −2 , and a small Tafel slope of 68 mV dec −1 , as well as high stability under 50 h of continuous testing. The present work could provide a facile route for fabricating 3D porous selenides for highly efficient OER catalysis.

Fabrication of amorphous Co/Mo–MnSex electrode materials for high-performance hybrid supercapacitors

“…4h shows the fine spectrum of Se 3d, with the peaks at 55.6 and 54.7 eV corresponding to 3d 3/2 and 3d 5/2 of Se 2À , respectively, and the peak at 59.0 eV corresponding to SeO x . 50…”

Ferrum-doped nickel selenide @tri-nickel diselenide heterostructure electrocatalysts with efficient and stable water splitting for hydrogen and oxygen production

“…3b, the high-resolution Ni 2p spectra of 0.6 show typical peaks centered at 873.09 eV [37] and 855.41 eV, attributed to Ni 2p 1/2 and Ni 2p 3/2 , respectively, and at 879.5 eV and 861.5 eV [38] for the satellite peaks, In Fig. 3c, the positions of the Se 3d 5/2 and 3d 3/2 peaks are located at 54 eV and 54.9 eV [39] , respectively. This shows the interfacial interaction between the FNS/0.6 heterostructures, which effectively shortens and accelerates the electron transfer pathway and rate during catalysis.…”

MnOx-decorated MOF-derived nickel–cobalt bimetallic phosphide nanosheet arrays for overall water splitting

“…Although their HER and OER performances are excellent, their large-scale industrial application is greatly limited by their inherent scarcity and high costs. 6,7 To address these challenges, a variety of cost-effective transition metal-based electrocatalysts with favourable activity for the OER or HER, such as metal oxides, 8,9 sulfides, 10,11 selenides, 12,13 nitrides 14,15 and phosphides, 16,17 have been developed. Dual-functional catalysts capable of catalyzing both the HER and the OER simultaneously are being explored to simplify the water splitting systems.…”