Double-Layer
3D Macro–Mesoporous Metal Oxide
Modified Boron-Doped Diamond with Enhanced Photoelectrochemical Performance
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Abstract
In this work, a TiO<sub>2</sub>/Sb-doped
SnO<sub>2</sub> electrode
was prepared on the boron-doped diamond (BDD) substrate with double-layer
three-dimensional macro–mesoporous (DL3DOM-m) structure, using
the polystyrene sphere (PS) vertical deposition method. The as-prepared
DL3DOM-m TiO<sub>2</sub>/SnO<sub>2</sub>/BDD was employed for organic
contaminant removal, showing excellent photoelectrocatalytic performance.
SEM, XRD and XPS indicated that DL3DOM-m electrode possessed a 3D
macroporous layered framework with uniform pore size (about 400 nm),
nanosized particles (4.5–5.8 nm), and high electroactive surface
area (3-fold more than that of BDD). SA-XRD indicated the backbone
of DL3DOM-m electrode had mesoporous structure. It was found that
the as-prepared electrode exhibited remarkable electrocatalytic activity,
high photocurrent and outstanding absorption capability (91.0 μg
cm<sup>–2</sup>). Furthermore, bisphenol A (BPA) was completely
decomposed after 3 h of reaction applying DL3DOM-m electrode as photoanode,
and that on BDD was only 58.9%. It indicated that the modified electrode
had great potential to be used in practical water treatment with high
photoelectrochemical performance