Dai Baoying, Fang Jiaojiao, Yu Yunru, Sun Menglong, Huang Hengming, Lu Chunhua, Kou Jiahui, Zhao Yuanjin, Xu Zhongzi
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China.
Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 210009, P. R. China.
Adv Mater. 2020 Mar;32(12):e1906361. doi: 10.1002/adma.201906361. Epub 2020 Feb 11.
Infrared light, more than 50% of the solar light energy, is long-termly ignored in the photocatalysis field due to its low photon energy. Herein, infrared-light-responsive photoinduced carriers driver is first constructed taking advantage of pyroelectric effect for enhancing photocatalytic hydrogen evolution. In order to give full play to its role, the photocatalytic reaction is localized on the surface and interface of the composite based on a new semi-immersion type heat collected photocatalytic microfiber system. The system is consisted of distinctive pyroelectric substrate poly(vinylidene fluoride-co-hexafluropropylene (PVDF-HFP), typical photothermal material carbon nanotube (CNT), and representative photocatalyst CdS. The transient photocurrent, electrochemical impedance spectroscopy, time-resolved photoluminescence and pyroelectric potential characterizations indicate that the infrared-light-responsive carriers driver significantly promotes the photogenerated charge separation, accelerates carrier migration, and prolongs carrier lifetime. The photocatalytic hydrogen evolution efficiency is remarkably improved more than five times with the highest average apparent quantum yield of 16.9%. It may open up new horizons to photocatalytic technology for the more efficient use of infrared light.
红外光占太阳光能量的50%以上，但由于其光子能量较低，在光催化领域长期被忽视。在此，首次利用热释电效应构建了红外光响应光生载流子驱动剂，以增强光催化析氢性能。为了充分发挥其作用，基于一种新型半浸没式集热光催化微纤维系统，将光催化反应定位在复合材料的表面和界面上。该系统由独特的热释电基底聚偏氟乙烯-六氟丙烯共聚物（PVDF-HFP）、典型的光热材料碳纳米管（CNT）和代表性的光催化剂硫化镉（CdS）组成。瞬态光电流、电化学阻抗谱、时间分辨光致发光和热释电电位表征表明，红外光响应载流子驱动剂显著促进了光生电荷分离，加速了载流子迁移，并延长了载流子寿命。光催化析氢效率显著提高了五倍多，最高平均表观量子产率达到16.9%。这可能为更有效地利用红外光的光催化技术开辟新的前景。
