Volatile organic compounds (VOCs) are attracting much
more attention
due to their contributions to air pollution and human health problems.
Photothermal catalytic oxidation is considered as an energy-saving
method for the removal of VOCs. However, the efficiency of the photothermal
catalytic system is still suffering from the low activity of the catalyst
due to its poor response to visible light and low efficiency of charge
separation. Here, few-layer CoAl–LDH (layered double hydroxide)
was prepared as an advantageous support for loading Pt nanoparticles
to obtain Pt–LDH, which were coated on CeO2 nanoparticles.
Type II heterojunctions were formed on the interface of LDH and CeO2. In photocatalysis, the hot electrons will move to CeO2, which is better at the activation of O2 molecules,
and holes will concentrate on the LDHs, which have plenty of hydroxyls
to generate •OH radicals. Furthermore, the Schottky heterojunctions
between LDH and Pt nanoparticles benefit the improvement of light
absorption by the localized surface plasmon resonance of Pt nanoparticles.
As a consequence, a high removal rate of toluene (75.7%) at a weight-hourly
space velocity of 23340 mL/(g·h) under visible light irradiation
(160 mW/cm2, λ > 400 nm) at room temperature was
achieved over the Pt–LDH/CeO2 catalyst. The catalyst
design provides a useful method to prepare high-efficiency photothermal
catalysts.
Here, we demonstrate a strategy to construct highly active CoxP/SrTiO3(Al) for overall water splitting. The as-prepared CoxP/SrTiO3(Al) photocatalyst shows a stable HER rate of 1.36 mmol−1 h−1 and OER rate of 0.635 mmol−1 h−1.
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