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Spiky nanohybrids of TiO2/Au nanorods for enhanced hydrogen evolution and photocurrent generation†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-12-26 00:00:00 , DOI: 10.1039/c7qi00717e Shan Zeng 1, 2, 3, 4, 5 , Hang Sun 1, 2, 3, 4, 5 , Yilun Wu 3, 4, 5, 6, 7 , Yinxing Shang 1, 2, 3, 4, 5 , Ping She 1, 2, 3, 4, 5 , Qinrong He 1, 2, 3, 4, 5 , Shengyan Yin 3, 4, 5, 6, 7 , Zhenning Liu 1, 2, 3, 4, 5
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-12-26 00:00:00 , DOI: 10.1039/c7qi00717e Shan Zeng 1, 2, 3, 4, 5 , Hang Sun 1, 2, 3, 4, 5 , Yilun Wu 3, 4, 5, 6, 7 , Yinxing Shang 1, 2, 3, 4, 5 , Ping She 1, 2, 3, 4, 5 , Qinrong He 1, 2, 3, 4, 5 , Shengyan Yin 3, 4, 5, 6, 7 , Zhenning Liu 1, 2, 3, 4, 5
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The fabrication of photocatalysts to achieve efficient utilization of renewable solar energy has attracted broad interest. Herein, a plasmonic spiky TiO2/Au nanorod (NR) nanohybrid was prepared by in situ nucleation and growth of spiky TiO2 in AuNR colloidal solution. The spiky TiO2/AuNR nanohybrids demonstrated enhanced hydrogen evolution activity and photocurrent generation under both visible light and simulated solar light irradiation as compared to bare spiky TiO2 nanoparticles and commercial TiO2. Specifically, the spiky nanohybrids displayed a high H2 production rate of 1.81 mmol g−1 h−1 under simulated solar light irradiation, which is 1.7 times higher than that of TiO2/Au nanosphere nanohybrids, and remain stable for three cycles. The improved photocatalytic H2 evolution demonstrated by the nanohybrids can be ascribed to the coupling effect of the AuNRs and the unique spiky structure. Furthermore, the charge transfer process during H2 evolution was investigated by photocurrent and electrochemical impendence spectroscopy (EIS) measurements. A fast and stable photocurrent was observed for the spiky TiO2/AuNR nanohybrid photoelectrode under both visible light and simulated solar light irradiation, while the EIS plots indicate a rapid charge transfer within the nanohybrids. Such a nanohybrid with a bio-inspired structure will afford new insights for the fabrication of novel photocatalysts.
中文翻译：
尖锐的TiO 2 / Au纳米棒纳米杂化物，可增强氢的释放和光电流的产生†
为了有效利用可再生太阳能而制造光催化剂引起了广泛的兴趣。本文中，通过在AuNR胶体溶液中原位成核并生长尖锐的TiO 2来制备等离激元尖锐的TiO 2 / Au纳米棒（NR）纳米杂化物。与裸尖刺的TiO 2纳米颗粒和商用TiO 2相比，尖刺的TiO 2 / AuNR纳米杂化物在可见光和模拟太阳光照射下均表现出增强的氢释放活性和光电流产生。具体而言，尖刺的纳米杂化物显示出1.81 mmol g -1 h -1的高H 2生成速率在模拟太阳光照射下，是TiO 2 / Au纳米球纳米杂化物的1.7倍，并在三个循环中保持稳定。纳米杂化物显示出改善的光催化H 2释放可以归因于AuNRs和独特的尖峰结构的偶联作用。此外，通过光电流和电化学阻抗谱（EIS）测量研究了H 2析出过程中的电荷转移过程。尖锐的TiO 2观察到快速稳定的光电流/ AuNR纳米杂化光电极在可见光和模拟太阳光照射下均能显示出来，而EIS图表明纳米杂化物内有快速的电荷转移。这种具有生物启发性结构的纳米杂化物将为新型光催化剂的制备提供新的见解。
更新日期：2017-12-26
中文翻译：
尖锐的TiO 2 / Au纳米棒纳米杂化物，可增强氢的释放和光电流的产生†
为了有效利用可再生太阳能而制造光催化剂引起了广泛的兴趣。本文中，通过在AuNR胶体溶液中原位成核并生长尖锐的TiO 2来制备等离激元尖锐的TiO 2 / Au纳米棒（NR）纳米杂化物。与裸尖刺的TiO 2纳米颗粒和商用TiO 2相比，尖刺的TiO 2 / AuNR纳米杂化物在可见光和模拟太阳光照射下均表现出增强的氢释放活性和光电流产生。具体而言，尖刺的纳米杂化物显示出1.81 mmol g -1 h -1的高H 2生成速率在模拟太阳光照射下，是TiO 2 / Au纳米球纳米杂化物的1.7倍，并在三个循环中保持稳定。纳米杂化物显示出改善的光催化H 2释放可以归因于AuNRs和独特的尖峰结构的偶联作用。此外，通过光电流和电化学阻抗谱（EIS）测量研究了H 2析出过程中的电荷转移过程。尖锐的TiO 2观察到快速稳定的光电流/ AuNR纳米杂化光电极在可见光和模拟太阳光照射下均能显示出来，而EIS图表明纳米杂化物内有快速的电荷转移。这种具有生物启发性结构的纳米杂化物将为新型光催化剂的制备提供新的见解。
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