A low overpotential
of 220 mV at 10 mA cm–2 comparable
to the benchmark RuO2 catalyst with a Tafel slope of 62
mV per decade having a turnover frequency of 3.17 s–1 is attained for strontium-doped lanthanum manganite (La0.7Sr0.3MnO3) coupled with cobalt phosphate (Co-Pi)
for the oxygen evolution reaction (OER). Impedence spectroscopic analysis
of La0.7Sr0.3MnO3/Co-Pi suggests
a favorable charge-transfer resistance results in efficient charge
carrier extraction. A Faradaic yield close to unity (98%) for the
OER suggests that the oxygen evolved during the reaction is solely
from the water oxidation.
The growth of hierarchical morphologies of complex metal oxides directly onto the substrate is a challenging task. Here in we report, unique hollow-cuboidal MnCo2O4 (h-MCO) morphology that offers insights into...
The
search for a bifunctional electrocatalyst having water cleavage
promoting ability along with the operational stability to efficiently
generate oxygen and hydrogen could lead to robust systems for applications.
These fundamental ideas can be achieved by designing the morphology,
tuning the electronic structure, and using dopants in their higher
oxidation states. Herein, we have fabricated a binder-free FeO(OH)–CoCeV-layered
triple hydroxide (LTH) bifunctional catalyst by a two-step hydrothermal
method, in which the nanograin-shaped FeO(OH) coupled with CoCeV-LTH
nanoflakes provides more electrocatalytically active sites and enhances
the charge-transfer kinetics for hydrogen evolution reaction (HER)
and oxygen evolution reaction (OER). The composition-optimized electrocatalyst
(FeO(OH)–Co0.5Ce0.05V0.15-LTH)
acts as an efficient water cleavage composite by virtue of its favorable
oxidation states leading to cyclic redox couples, which yields an
overpotential of 53 mV for HER and 227 mV for OER to drive 10 mA/cm2 current density in 1 M KOH with a corresponding Tafel slope
of 70 mV/dec for HER and 52 mV/dec for OER. Furthermore, for the overall
water splitting reaction, the heterostructure FeO(OH)–Co0.5Ce0.05V0.15-LTH acts as a dual-functional
electrocatalyst, which requires a cell voltage of 1.52 V versus RHE
to drive 10 mA/cm2 current density.
Phosphorus nitride dots (PNDs) as a metal-free and versatile support over host of metal oxide-based photoelectrochemical (PEC) water oxidations are reported. PNDs have the ability to form various heterojunctions by...
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