Controllable synthesis of high-efficient TaOxNy and Ta3N5 photocatalysts through vacuum nitriding using melamine as a nitrogen source
Controllable synthesis of high-efficient TaOxNy and Ta3N5 photocatalysts through vacuum nitriding using melamine as a nitrogen source
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三聚氰胺为氮源真空氮化可控合成高效TaOxNy和Ta3N5光催化剂
DOI：
10.1016/j.jallcom.2019.151846
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发表时间：
2019-11
影响因子：
6.2
通讯作者：
Xu Zhenming
中科院分区：
文献类型：
--
作者：
Niu Bo;Liu Binyang;Xu Zhenming
氮化钽（氧）被认为是一种很有前途的可见光驱动光催化剂。传统的高温（850-1150 °C） nh3气体制备钽（氧）氮化物的方法由于工艺危险和复杂性而不受欢迎。此外，钽（氧）氮化物中不希望存在的缺陷（O杂质和N空位）降低了光催化活性。本文以三聚氰胺为氮源，开发了一种更安全、更简单、可控的真空氮化法制备高效氧化钠和ta3n5的方法。研究了真空氮化条件对样品的微观结构、组成、光吸附和光催化析氢的影响。TaOxNyand ta3n5在压力低于2 × 104Pa，温度为500-700 ℃，保温时间为6 h的条件下可以得到。与传统nh3氮化制备的样品相比，真空氮化制备的taoxny5和ta3n5具有更低的缺陷、更高的充电剂分离率和更高的比表面积，从而增强了光催化析氢能力。此外，根据氮势理论，真空条件增加了氮势，促进了活性氮与样品的碰撞，实现了更有效的氮置换。本研究为简单合成低缺陷的高效氮化钽（氧）化物提供了条件。
Tantalum (oxy) nitrides have been considered as very promising visible-light-driven photocatalysts for overall water splitting. The traditional tantalum (oxy) nitrides preparation using NH3gas at high temperature (850-1150 °C) is not favored for the dangerous process and complexity. Furthermore, the undesirable defects (O impurities and N vacancies) in tantalum (oxy) nitrides reduce the photocatalytic activity. Herein, we developed a safer and simpler approach for controllable preparing high-efficient TaOxNyand Ta3N5through vacuum nitriding using melamine as a nitrogen source. The effect of vacuum nitriding conditions on the microstructure, composition, photo-adsorption and photocatalytic H2evolution of the samples were studied. TaOxNyand Ta3N5can be obtained with the pressure below 2 × 104Pa, temperature of 500–700 °C and holding time for 6 h. Compared to the samples synthesized by traditional NH3nitriding, the as-prepared TaOxNyand Ta3N5by vacuum nitriding exhibited enhanced photocatalytic H2evolution owing to the lower defects, higher charger separation rate and higher specific surface area. Furthermore, according to the nitrogen potential theory, vacuum condition increased the nitrogen potential and promoted the collision of active nitrogen with the sample, which achieved more effective nitrogen replacement. This study contributes to the simple synthesis of high-efficient tantalum (oxy) nitrides with lower defects.
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影响因子：
6.7
作者：
Nguyen Thi Phuong Le Chi;N. Cam;Doan V. Thuan;T. Truong;N. T. Truc;Cao Van Hoang;T. T. Phuong-T.
通讯作者：
Nguyen Thi Phuong Le Chi;N. Cam;Doan V. Thuan;T. Truong;N. T. Truc;Cao Van Hoang;T. T. Phuong-T.
影响因子：
7.3
作者：
Thi Dieu Cam Nguyen;Thi Phuong Le Chi Nguyen;H. Mai;Van-Duong Dao;Minh Phuong Nguyen;V. Nguyen
通讯作者：
Thi Dieu Cam Nguyen;Thi Phuong Le Chi Nguyen;H. Mai;Van-Duong Dao;Minh Phuong Nguyen;V. Nguyen
影响因子：
7.3
作者：
Jiajia Wang;Tao Fang;Li Zhang;Jianyong Feng;Zhaosheng Li;Z. Zou
通讯作者：
Jiajia Wang;Tao Fang;Li Zhang;Jianyong Feng;Zhaosheng Li;Z. Zou
影响因子：
3.3
作者：
Kazuhisa Kishida;Tomoaki Watanabe
通讯作者：
Kazuhisa Kishida;Tomoaki Watanabe
影响因子：
8.6
作者：
Dabirian, Ali;van de Krol, Roel
通讯作者：
van de Krol, Roel