【摘要】 采用一步水解法，通过控制不同水解时间制备系列Bi₁₂O₁₇Br₂,对其晶相、氮吸脱附、光吸收及电化学特性进行鉴定与表征。将Bi₁₂O₁₇Br₂用于可见光辐照下光催化固氮的结果表明，随制备时水解时间的延长，Bi₁₂O₁₇Br₂对N₂的化学吸附量增大，光催化固氮的活性增加，在不采用助剂、仅有N₂和水的情况下，产NH⁺₄的速率高达144μmol/（L·g·h）。电化学测定结果显示，随制备时水解时间的延长，所得Bi₁₂O₁₇Br₂的电化学阻抗降低、光电流响应增大。更多还原

【Abstract】 A serials of Bi₁₂O₁₇Br₂ were prepared by one-step hydrolysis under mild conditions, and their crystal phase, interaction with N₂, optical and electrochemical features were systematically characterized and analyzed. The results showed that the photocatalytic performance of Bi₁₂O₁₇Br₂ for N₂ fixation was greatly improved with increasing the hydrolysis time. The yield of NH⁺₄ reached 144 μmol/（L·g·h） without the addition of sacrificial agents and co-catalysts. Electrochemical measurement results show that Bi₁₂O₁₇Br₂ prepared with long-time hydrolysis has small electrochemical impedance, which could be beneficial to efficient separation of photogenerated carriers. As a result, long-time hydrolysis make Bi₁₂O₁₇Br₂ a promising catalyst for photocatalytic fixation of nitrogen under visible light.更多还原