High‐performance Te‐doped Co ₃ O ₄ nanocatalysts for oxygen evolution reaction

Abstract

To reduce the overpotential of electrocatalytic oxygen evolution reaction (OER) for high-efficiency water splitting, a series of 2 to 5 nm ultrafine spinel Co 3 O 4 nanoparticles (NPs) with varied amount of lattice-doped Te (XTe-Co 3 O 4 , X represents the nominal molar ratio Te/Co of 0, 2, 4, 6, 8%) as catalysts were prepared through a simple hydrothermal synthesis method. The 6% Te-Co 3 O 4 catalyst was optimized to obtain the overpotential as low as 313 mV at 10 mA cm À2 , a small Tafel slope of 75 mV dec À1 in 1 M KOH for OER, outperforming this series and many reported Co 3 O 4 -based catalysts. Te doping introduced lattice distortion and resulted in smaller size of Te-Co 3 O 4 NPs with enlarged surface area for more accessible active sites. Oxygen vacancies were created to modify the electronic structure, improve the active sites density, and decrease the kinetic energy barriers of XTe-Co 3 O 4 . The electronic conductivity of 6%Te-Co 3 O 4 was improved to accelerate the charge transfer efficiency. All these effects contributed to promoting the reaction kinetics and minimizing the OER overpotentials for high-performance electrocatalysis.

Regulating the Electronic Structure of Ruddlesden–Popper-Type Perovskite by Chlorine Doping for Enhanced Oxygen Evolution Activity

“…The peaks in SLCOCl 0.15 exhibit a deviation to a higher wavenumber, which can be attributed to the limiting effect of photons caused by the increase in atomic vacancy defects in the lattice. 47 These results together confirmed that the introduction of Cl significantly increases the composition of oxygen defects, which is beneficial to the improvement of OER performance.…”

Facile fabrication of self-supporting porous CuMoO4@Co3O4nanosheets as a bifunctional electrocatalyst for efficient overall water splitting

“…43 Meanwhile, the bands at 277, 371 and 657 cm −1 correspond to the stretching vibration of Co 3 O 4 . 44,45 The Raman results showed that CuMoO 4 @Co 3 O 4 was successfully synthesized on the surface of the electrode.…”

Marine Algae Extract (Grateloupia Sparsa) for the Green Synthesis of Co3O4NPs: Antioxidant, Antibacterial, Anticancer, and Hemolytic Activities

“…As explained, the nanoparticles clump together and form massive particles. The aggregation of nanoparticles has been described as an indication of metallic nanoparticle production processes [ 55 , 56 ].…”