Trimetallic-organic framework/MXene composite as an oxygen evolution reaction electrocatalyst with elevated intrinsic activity

Abstract

A composite of trimetallic Fe2.1Ni0.2Co0.7-MIL-88A grown on Ti3C2Tx MXene nanosheets was successfully synthesized and employed as a high-performance OER electrocatalyst with a low overpotential of 231 mV at 10 mA cm−2 current density in alkaline media.

Three-Dimensional Network of Highly Uniform Cobalt Oxide Microspheres/MXene Composite as a High-Performance Electrocatalyst in Hydrogen Evolution Reaction

“…3a reveal that the Co-gly spheres exhibit wide diffraction peaks, which is indicative of the presence of metal alkoxides. 48 The primary peaks of the Co 3 O 4 sample in its original state appear clearly at diffraction angles of 19.00 (111), 31.27 (022), 36.85 (113), 44.82 (004), 55.67 (224), 59.37 (115), and 65.25 (044)°. These peaks can be accurately attributed to the JCPDS no.…”

“…Because of these advantages, MXene is particularly promising in a wide range of applications, including energy storage, catalysis, − transparent electronic devices, separation membranes, sensors, reinforcement for composites, electromagnetic shielding, and biomedicine. − Van der Waals attraction and hydrogen bonds, however, also contribute to MXene’s great tendency for intersheet aggregation. The aforementioned limitation gives rise to a decline in performance due to the reduction in surface area and challenges in the processability of materials based on MXene. , This issue may be effectively solved by adding interlayer spacers, such as polymers, nanoparticles, big ions, nanotubes, or even gaseous species, between MXene nanosheets. ,,− The utilization of a 3D MXene frame, which possesses exceptional conductivity and hydrophilic characteristics, serves to improve the kinetics of charge transfer and the adsorption/activation of water molecules on electrocatalysts. The 3D linked structure of the composite provides efficient and rapid access to the electrolyte .…”

Hierarchical Porous Carbon Supported Co2P2O7 Nanoparticles for Oxygen Evolution and Oxygen Reduction in a Rechargeable Zn–Air Battery

“…However, the catalyst exhibited only good ORR activity. It is therefore postulated that the phosphating of the active center may endow the catalyst with bifunctionality. − The potential center of cobalt pyrophosphate (Co 2 P 2 O 7 ) allows for the maintenance of several intermediate states of cobalt geometry, including tetrahedral, trigonal bipyramidal, and low-octahedral configurations . In addition, the flexibility between the PO 4 3– groups and Co promotes the flexible coordination of PO 4 3– groups with transition metals, which can easily change their local positions to ensure effective redox changes of the transition metals .…”