Improved photoelectrocatalytic degradation of methylene blue by Ti3C2Tx/Bi12TiO20 composite anodes

In order to effectively reduce the high recombination rate of photogenerated carriers when Bi 12 TiO 20 (BTO) was excited by visible light, Ti 3 C 2 T x /BTO/fluorine-doped tin oxide photoanodes were conveniently prepared with the aid of mechanical coating by gentle ultrasonic mixing. Systematic characterization and the degradation of methylene blue in a photoelectrochemical cell were performed. The results showed that the Ti 3 C 2 T x /BTO composite exhibited a strong light absorption ability and the effective separation of photogenerated carriers. The optimal anode (6 wt% Ti 3 C 2 T x /BTO) degraded 85.4% of methylene blue within 120 min at an applied electric field of 1 V, with a reaction rate that was 3.5 times that of BTO. It was proved that Ti 3 C 2 T x , as a useful co-catalyst, creates an internal electric field at the contact interface with BTO and an external electric field, which are responsible for the enhanced photoelectrocatalytic degradation capacity of the composite anode materials. • Ti 3 C 2 T x /BTO/FTO anodes were fabricated via ultrasonic mixing and mechanical coating. • Excellent photoelectrocatalytic MB degradation with Ti 3 C 2 T x /BTO/FTO anodes was found. • Ti 3 C 2 T x catalyst formed a Schottky junction that aided charge transfer and separation. • Internal and external electric fields prevented recombination and improved degradation.

为了有效降低Bi₁₂TiO₂₀（BTO）在可见光激发时光生载流子的高复合率，通过温和超声混合辅助机械涂覆的方法便捷地制备了Ti₃C₂Tₓ/BTO/氟掺杂氧化锡光阳极。对其进行了系统表征以及在光电化学池中对亚甲基蓝的降解实验。结果表明，Ti₃C₂Tₓ/BTO复合材料表现出很强的光吸收能力以及光生载流子的有效分离。最佳阳极（6 wt% Ti₃C₂Tₓ/BTO）在1 V外加电场下，120分钟内降解了85.4%的亚甲基蓝，反应速率是BTO的3.5倍。证明了Ti₃C₂Tₓ作为一种有效的助催化剂，在与BTO的接触界面处产生内电场以及外电场，这是复合阳极材料光电催化降解能力增强的原因。 • 通过超声混合和机械涂覆制备了Ti₃C₂Tₓ/BTO/FTO阳极。 • 发现Ti₃C₂Tₓ/BTO/FTO阳极对亚甲基蓝具有优异的光电催化降解性能。 • Ti₃C₂Tₓ催化剂形成了肖特基结，有助于电荷转移和分离。 • 内电场和外电场阻止了复合，提高了降解性能。