86 research outputs found
Electrochemical Synthesis of Nanostructured Metal-doped Titanates and Investigation of Their Activity as Oxygen Evolution Photoanodes
Mixed
and doped metal oxides are excellent candidates for commercial energy
applications such as batteries, supercapacitors, solar cells, and
photocatalyts due to their activity, stability, tailorable band edge
and bandgaps, and low cost. However, the routes commonly employed
in their synthesis present synthetic bottlenecks with reliance on
sacrificial materials, the use of high temperatures, long reaction
times, and little ability to control morphology, thus compromising
their scale-up. Herein, we present the single-pot, electrochemical
synthesis of high surface area, doped metal titanate nanostructures,
including Na2Ti3O7 (NTO), 25 wt %
Sn:NTO, 5 wt % Fe:NTO, and 3 wt % Cu:NTO. The synergistic use of the
cathodic corrosion method with suspended droplet alloying (SDA) led
to materials with excellent homogeneity, presenting a promising route
for the screening, production, and discovery of electroactive materials.
As proof of concept of the synthetic control and impact on reactivity,
we found that the photoanodic oxygen evolution activity of the nanomaterials
was adversely affected by Fe and Sn doping into NTO while Cu doping,
at 3 wt %, displayed significant improvement. This work demonstrates
the ability of the cathodic corrosion method to obtain compositionally
and structurally controlled mixed-metal oxides in a rapid fashion,
thus creating new opportunities in the field of materials engineering
and the systematic study of compositional gradients on the (photo)electrochemical
performance of metal oxide nanoparticles
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