Skate Key Laboratory for Powder Metallurgy , Central South University , Changsha 410083 , P. R. China.
Department of Chemical and Biomolecular Engineering , National University of Singapore , 10 Kent Ridge Crescent , Singapore 119260 , Singapore.
ACS Appl Mater Interfaces. 2018 Jun 27;10(25):21328-21334. doi: 10.1021/acsami.8b04837. Epub 2018 Jun 15.
Tantalum oxynitride-based materials, which possess narrow band gaps and sufficient band energy potentials, have been of immense interest for water splitting. However, the efficiency of photocatalytic reactions is still low because of the fast electron-hole recombination. Here, a SrTaON /SrTaON heterostructured photocatalyst with a well-matched band structure was in situ constructed by the nitridation of hydrothermal-prepared SrTaO nanosheets. Compared to SrTaON and pure SrTaON, the SrTaON /SrTaON heterostructured photocatalyst exhibited the highest rate of hydrogen evolution, which is ca. 2.0 and 76.4 times of SrTaON and pure SrTaON, respectively, under the similar reaction condition. The enhanced performance arises from the formation of suitable band-matched heterojunction-accelerated charge separation. This work provides a promising strategy for the construction of tantalum oxynitride-based heterojunction photocatalysts.
基于氮化钽的材料具有较窄的带隙和充足的能带能量势，因此在水分解方面引起了极大的关注。然而，由于电子-空穴复合速度快，光催化反应的效率仍然较低。在这里，通过水热法制备的 SrTaO 纳米片的氮化原位构建了具有良好匹配能带结构的 SrTaON/SrTaON 异质结构光催化剂。与 SrTaON 和纯 SrTaON 相比，在类似的反应条件下，SrTaON/SrTaON 异质结构光催化剂表现出最高的析氢速率，分别约为 SrTaON 和纯 SrTaON 的 2.0 和 76.4 倍。性能的提高源于形成合适的能带匹配异质结，从而加速了电荷分离。这项工作为构建基于氮化钽的异质结光催化剂提供了一种有前途的策略。
