构建 Vo-TiO2/Ag/TiO2 异质结以高效光电化学将氮还原为氨,The Journal of Physical Chemistry C

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构建 Vo-TiO2/Ag/TiO2 异质结以高效光电化学将氮还原为氨
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-01-13 , DOI: 10.1021/acs.jpcc.2c08279
Sheng Lin ₁ , Jun-Bo Ma ₁ , Jiang-Jian Fu ₁ , Lan Sun ₁ , Hua Zhang ₁ , Jun Cheng ₁ , Jian-Feng Li ₁

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光电化学（PEC）固氮（N ₂ ）技术为在温和条件下生产氨（NH _{3 ）提供了可能，但由于N}₂的高键能和离子势，该过程中N ₂的还原效率受到很大限制. _{在此，构建了由金红石TiO 2}纳米棒阵列、Ag纳米颗粒和具有氧空位的锐钛矿TiO _2纳米片(V_o -TiO ₂ )组成的V _o -TiO ₂ /Ag/TiO ₂光电极，以加速N _{2的PEC还原。}变成氨。_{TiO 2}纳米棒、Ag纳米粒子和V _o -TiO ₂纳米片之间的异质结可以促进光生载流子的分离。_{此外，来自 TiO 2}导带的光生电子和来自 Ag 纳米粒子的局域表面等离子体共振 (LSPR) 效应的热电子被注入到 V _o -TiO ₂的导带中，并被 V _o -进一步捕获。 TiO ₂氧空位，能将吸附在催化剂上的N _2还原为NH₃。在没有任何牺牲剂的情况下，平均 NH ₃产率可达51.2 μg h ^–1 cm ^–2。该催化剂即使在多次使用后也表现出优异的稳定性。Ag纳米粒子的局域表面等离子体共振效应和异质结结构促进了TiO ₂纳米棒阵列更好的PEC性能。

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Constructing the Vo-TiO2/Ag/TiO2 Heterojunction for Efficient Photoelectrochemical Nitrogen Reduction to Ammonia

Photoelectrochemical (PEC) nitrogen (N₂) fixation technology provides the possibility to produce ammonia (NH₃) under mild conditions, but the efficiency of N₂ reduction in this process is greatly limited due to the high bond energy and ionic potential of N₂. Herein, the V_o-TiO₂/Ag/TiO₂ photoelectrode consisting of rutile TiO₂ nanorod arrays, Ag nanoparticles, and anatase TiO₂ nanosheets with oxygen vacancies (V_o-TiO₂) was constructed for accelerating the PEC reduction of N₂ into ammonia. The separation of photogenerated carriers can be promoted by the heterojunction among TiO₂ nanorods, Ag nanoparticles, and V_o-TiO₂ nanosheets. Furthermore, the photogenerated electrons from the conduction band of TiO₂ and the hot electrons from Ag nanoparticles’ local surface plasmon resonance (LSPR) effect were injected into the conduction band of V_o-TiO₂, and they were further captured by V_o-TiO₂ oxygen vacancy and can reduce N₂ that adsorbed on the catalyst to NH₃. Without any sacrificial agent, the average NH₃ production rate can reach 51.2 μg h^–1 cm^–2. The catalyst exhibited excellent stability even after multiple uses. The LSPR effect of Ag nanoparticles and heterojunction structure promote the better PEC performance of TiO₂ nanorod arrays.

更新日期：2023-01-13

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