Liu Li, Cao Yang, He Junhui, Qi Xiaopeng, Shi Wensheng, Yang Qiaowen
Functional Nanomaterials Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China.
J Nanosci Nanotechnol. 2013 Oct;13(10):6835-40. doi: 10.1166/jnn.2013.7787.
Large-area Si/TiO2 core/shell nanowire arrays were prepared for the first time by solution approach, followed by annealing in Ar (SiNWs/TiO2-Ar) and air (SiNWs/TiO2-air) atmosphere, respectively. Au nanoparticles were decorated onto the SiNWs/TiO2-Ar samples (SiNWs/TiO2@AuNPs-Ar) to further improve the photoactivity. XRD results showed that the TiO2 shells have an anatase crystalline structure. Photocurrent of solar water splitting was measured by a three electrode setup, in which the Si/TiO2 core/shell nanowire array served as the working electrode. It was found for the first time that Ar ambience annealing is more helpful improving the photocurrent density. The SiNWs/TiO2-Ar sample enhanced the photocurrent by 6.3 times compared to the SiNWs/TiO2-air sample. Furthermore, the SiNWs/TiO2@AuNPs-Ar arrays exhibited a photocurrent of 0.9 mA/cm2, 3.6 times as high as that of its counterpart without Au nanoparticles.
首次通过溶液法制备了大面积的硅/二氧化钛核壳纳米线阵列，随后分别在氩气（SiNWs/TiO2-Ar）和空气（SiNWs/TiO2-air）气氛中进行退火处理。将金纳米颗粒修饰在SiNWs/TiO2-Ar样品（SiNWs/TiO2@AuNPs-Ar）上，以进一步提高光活性。X射线衍射结果表明，二氧化钛壳层具有锐钛矿晶体结构。通过三电极装置测量太阳能水分解的光电流，其中硅/二氧化钛核壳纳米线阵列用作工作电极。首次发现氩气气氛退火更有助于提高光电流密度。与SiNWs/TiO2-air样品相比，SiNWs/TiO2-Ar样品的光电流提高了6.3倍。此外，SiNWs/TiO2@AuNPs-Ar阵列的光电流为0.9 mA/cm2，是其不含金纳米颗粒的对应物的3.6倍。
