Üzer Ebru, Kumar Pawan, Kisslinger Ryan, Kar Piyush, Thakur Ujwal Kumar, Shankar Karthik, Nilges Tom
Department of Chemistry, Technical University of Munich Lichtenbergstr. 4 85748 Garching Germany
Department of Electrical and Computer Engineering 9211-116 Street NW Edmonton Alberta Canada T6G 1H9
Nanoscale Adv. 2019 May 24;1(8):2881-2890. doi: 10.1039/c9na00084d. eCollection 2019 Aug 6.
We report successful synthesis of low band gap inorganic polyphosphide and TiO heterostructures with the aid of short-way transport reactions. Binary and ternary polyphosphides (NaP, SnIP, and (CuI)P) were successfully reacted and deposited into electrochemically fabricated TiO nanotubes. Employing vapor phase reaction deposition, the cavities of 100 μm long TiO nanotubes were infiltrated; approximately 50% of the nanotube arrays were estimated to be infiltrated in the case of NaP. Intensive characterization of the hybrid materials with techniques including SEM, FIB, HR-TEM, Raman spectroscopy, XRD, and XPS proved the successful vapor phase deposition and synthesis of the substances on and inside the nanotubes. The polyphosphide@TiO hybrids exhibited superior water splitting performance compared to pristine materials and were found to be more active at higher wavelengths. SnIP@TiO emerged to be the most active among the polyphosphide@TiO materials. The improved photocatalytic performance might be due to Fermi level re-alignment and a lower charge transfer resistance which facilitated better charge separation from inorganic phosphides to TiO.
我们报道了借助短程传输反应成功合成低带隙无机聚磷化物与TiO异质结构。二元和三元聚磷化物（NaP、SnIP和(CuI)P）成功发生反应并沉积到电化学制备的TiO纳米管中。采用气相反应沉积法，将100μm长的TiO纳米管的孔洞进行渗透；在NaP的情况下，估计约50%的纳米管阵列被渗透。通过扫描电子显微镜（SEM）、聚焦离子束（FIB）、高分辨率透射电子显微镜（HR-TEM）、拉曼光谱、X射线衍射（XRD）和X射线光电子能谱（XPS）等技术对这些混合材料进行的深入表征证明了这些物质在纳米管内外成功的气相沉积和合成。与原始材料相比，聚磷化物@TiO杂化物表现出优异的水分解性能，并且发现在更高波长下更具活性。在聚磷化物@TiO材料中，SnIP@TiO表现出最高的活性。光催化性能的提高可能归因于费米能级的重新排列和较低的电荷转移电阻，这有利于从无机磷化物到TiO实现更好的电荷分离。
