Choi Junghyun, Sudhagar Pitchaimuthu, Kim Joo Hyun, Kwon Jiseok, Kim Jeonghyun, Terashima Chiaki, Fujishima Akira, Song Taeseup, Paik Ungyu
Department of Energy Engineering, Hanyang University, Seoul, South Korea.
Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
Phys Chem Chem Phys. 2017 Feb 8;19(6):4648-4655. doi: 10.1039/c6cp08199a.
We demonstrate the dual advantages of graded photoabsorbers in mesoporous metal oxide-based hetero interfacial photoanodes in improving photogenerated charge carrier (e/h) separation for the solar light-driven water-oxidation process. The pre-deposition of sol-gel-derived, tungsten-doped bismuth vanadate (W:BiVO) onto a primary BiVO water oxidation layer forms graded interfaces, which facilitate charge transfer from the primary photoabsorber to the charge transport layer, thereby superseding the thickness-controlled charge recombination at the BiVO water oxidation catalyst. As a result, the WO/BiVO hetero photoanode containing the photoactive W:BiVO interfacial layer showed 130% higher photocurrent than that of the interfacial layer-free hetero photoelectrode owing to the enhanced charge separation led water oxidation process.
我们展示了介孔金属氧化物基异质界面光阳极中梯度光吸收剂在改善用于太阳光驱动水氧化过程的光生电荷载流子（电子/空穴）分离方面的双重优势。通过溶胶 - 凝胶法制备的钨掺杂钒酸铋（W:BiVO）预沉积在初级BiVO水氧化层上形成梯度界面，这有利于电荷从初级光吸收剂转移到电荷传输层，从而取代了BiVO水氧化催化剂处受厚度控制的电荷复合。结果，由于电荷分离增强导致水氧化过程，含有光活性W:BiVO界面层的WO/BiVO异质光阳极的光电流比无界面层的异质光电极高130%。
