Rare-Earth Metal–Organic Framework-Derived La₂O₃/Ni_xP_y Nanoparticles Embedded in Nitrogen-Doped Porous Carbon as Efficient Electrocatalysts for the Oxygen Evolution Reaction

Abstract

Exploring non-noble metal electrocatalysts with high activity, elevated stability, and low cost is of great significance for efficient electrochemical energy storage and conversion technologies. Herein, rare-earth metal−organic framework (LaNi-MOF)derived three-dimensional La 2 O 3 /Ni x P y nanoparticles embedded in nitrogen-doped porous carbon (La 2 O 3 /Ni x P y @NC) are rationally synthesized by a facile solvothermal method followed by pyrolysis and a low-temperature phosphating strategy. The highly conductive nitrogen-doped porous carbon and the synergistic effect between La 2 O 3 and Ni x P y nanoparticles provide abundant active catalytic sites and enhance the electron mass transfer capability, which endows the La 2 O 3 /Ni x P y @NC catalyst with excellent oxygen evolution reaction activity. Moreover, the La 2 O 3 /Ni x P y @NC catalyst provides a low overpotential (η 100 = 384 mV), which is superior to that of commercial RuO 2 (η 100 = 451 mV). More importantly, the introduction of La 2 O 3 can not only effectively adjust the electronic structure and morphology of the catalyst but also significantly improve the long-term stability and durability of the La 2 O 3 /Ni x P y @NC electrocatalyst. This work provides an efficient strategy for the future design of highly efficient catalysts enriched with rare-earth species.

Construction of Bimetallic-Anchored Two-Dimensional Nanosheets on COF for Rechargeable Zinc-Air Batteries

“…For decades, green chemistry, energy regeneration, and other energy issues have been a problem that all researchers have been trying to solve. − Over the years, the large amount of primary energy inputs has led to a gradual increase in the proportion of global pollution, along with the depletion of nonrenewable energy problems, so there is an urgent need for secondary energy technology that can be used as a substitute. − According to literature research, zinc-air batteries have great potential as a secondary energy technology because of their huge theoretical energy. − Although it has great potential, the slow kinetics of the oxygen reduction and oxygen precipitation reactions during the charging and discharging process of zinc-air batteries lead to low cycle efficiency, which prevents the batteries from being used on a large scale. Pt-based noble metals are considered to be the ideal catalysts for zinc-air batteries, but due to their scarcity, they are not available for large-scale applications due to their high cost. − Therefore, according to the literature, it was found that in recent years, many researchers have done a lot of work on the nonprecious metal catalysts used, − such as doped transition metal oxides, synthesized MOFs and COFs, carbon-based materials containing metals, and so on, in place of precious metals. − Although a lot of beautiful work has been done and quite high performance has been shown, it is still not up to the desired level.…”

Metal–Organic Skeleton-Derived P-CoFe2O4@CN Nanoparticles Embedded with Nitrogen-Doped Carbon as Effective Electrocatalysts for the Oxygen Evolution Reaction

“…So far, RuO 2 and IrO 2 catalysts are recognized as efficient catalysts for the OER. However, their high cost and scarcity have hindered their large-scale application. − Therefore, the development of inexpensive OER nonprecious metal catalysts with high activity and the ability to be substituted for precious metals remains a problem that has to be resolved.…”

Interfacial Se–O Bonds Modulating Spatial Charge Distribution in FeSe2/Nb:Fe2O3 with Rapid Hole Extraction for Efficient Photoelectrochemical Water Oxidation

“…According to previous reports, FeSe 2 and CoSe 2 nanoparticles loaded on nitrogen-doped three-dimensional porous carbon nanosheets could optimize the free energy of oxygen-containing intermediates during OER. 24 Another study demonstrates that the interface structure in CoSe/FeSe 2 nanohybrid electrocatalyst could induce abundant internal defects and modulate the charge density distribution between different components, beneficial for accelerating the electrochemical reaction kinetics. 25 Herein, taking Nb 5+ -doped 26 Specifically, 0.405 g of FeCl 3 •6H 2 O and 0.09 g of CO(NH 2 ) 2 were dispersed in 10 mL of deionized water, and the above solution was transferred to a 25 mL Teflon-lined stainless-steel autoclave.…”