材料科学
光催化
催化作用
锐钛矿
氧气
化学工程
氮气
氨生产
热液循环
光化学
无机化学
纳米技术
化学
工程类
有机化学
作者
Yunxuan Zhao,Yufei Zhao,Run Shi,Bin Wang,Geoffrey I. N. Waterhouse,Li‐Zhu Wu,Chen‐Ho Tung,Tierui Zhang
标识
DOI:10.1002/adma.201806482
摘要
Abstract Dinitrogen reduction to ammonia using transition metal catalysts is central to both the chemical industry and the Earth's nitrogen cycle. In the Haber–Bosch process, a metallic iron catalyst and high temperatures (400 °C) and pressures (200 atm) are necessary to activate and cleave NN bonds, motivating the search for alternative catalysts that can transform N 2 to NH 3 under far milder reaction conditions. Here, the successful hydrothermal synthesis of ultrathin TiO 2 nanosheets with an abundance of oxygen vacancies and intrinsic compressive strain, achieved through a facile copper‐doping strategy, is reported. These defect‐rich ultrathin anatase nanosheets exhibit remarkable and stable performance for photocatalytic reduction of N 2 to NH 3 in water, exhibiting photoactivity up to 700 nm. The oxygen vacancies and strain effect allow strong chemisorption and activation of molecular N 2 and water, resulting in unusually high rates of NH 3 evolution under visible‐light irradiation. Therefore, this study offers a promising and sustainable route for the fixation of atmospheric N 2 using solar energy.
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