Abstract
Ga2O3 nanostructures hold great potential applications in photocatalytic fields due to their stability, high efficiency and environmental friendliness. The construction of phase junction has been proved to be one of the most effective strategies for enhancing Ga2O3 photocatalytic activity. However, the influence of the formation process at the interface of the phase junction on the photocatalytic activity of Ga2O3 nanostructures is far less well understood. In this work, for the first time, large-area Ga2O3 nanorod arrays (NRAs) with controllable α/β phase junction were prepared in situ on a flexible glass fiber fabric by a facile and environmentally friendly three-step method. The α/β-Ga2O3 phase junction NRAs exhibit an ultra-high photocatalytic degradation rate of 97% during Ultraviolet (UV) irradiation for 60 min, which is attributed to a unique phase junction promoting efficient charge separation. However, the photocatalytic activity of α/β-Ga2O3 phase junction NRAs is not evident in the early phase transition, possibly due to the presence of defects acting as charge recombination centers.
Highlights
The electrochemical measurements were performed in a three-electrode con guration system using a CHI 760E electrochemical workstation (CH Instruments, China), including the as-prepared Fluorine doped tin oxide (FTO) working electrodes, Pt foil as the counter electrode and saturated calomel electrode (SCE) as the reference electrode. 0.5 M Na2SO4 aqueous solution was used as the electrolyte
The result is unsynchronized with that revealed by the X-ray diffractometer (XRD) patterns, which can be attributed to the strong sensitivity of UV Raman spectroscopy to the surface region, and XRD mainly re ects the bulk information of materials.[47]
The Ga2O3-60 nanorod arrays (NRAs) exhibits the best photocatalytic with a degradation rate of 97%, which can be attributed to the a/b-Ga2O3 phase junction promoting the separation of photogenerated electrons and holes.[47]
Summary
With the continuous development of the social economy, environmental pollution has become an increasingly serious problem, prompting humans to continuously explore new solutions.[1,2,3,4,5,6] Photocatalytic reaction, as a simple, efficient and cost-effective method, has promising applications in the removal of environmental pollutants and attracted wide attention.[7,8,9,10,11,12,13] Recently, various metal oxides with d10 (In3+, Ga3+, Ge4+, Sn4+) con gurations have been reported as effective photocatalysts for photodegradation of various organic pollutants.[14,15] Ga2O3 is a typical representative among them.[16]. Phase transformation is a process from the surface to the bulk, and different thicknesses of phase interface may result in various photocatalytic activities.[49] an in-depth understanding of junction-related issues will aid in the design and preparation of efficient Ga2O3. The as-prepared a/ b-Ga2O3 phase junction NRAs exhibited excellent photocatalytic activity for the degradation of Rhodamine B (RhB) aqueous solution. The mechanism of photocatalytic activity enhancement was discussed and compared with related literature
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