Improved visible-light catalytic activities of novel Au/P-doped g-C3N4 photocatalyst for solar fuel production and mechanism
Improved visible-light catalytic activities of novel Au/P-doped g-C3N4 photocatalyst for solar fuel production and mechanism
复制标题
新型Au/P掺杂g-C3N4光催化剂在太阳能燃料生产中提高可见光催化活性及其机理
DOI：
10.1016/j.apcata.2018.10.007
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发表时间：
2018-11-25
影响因子：
5.5
通讯作者：
Luo, Wei
中科院分区：
文献类型：
--
作者：
Humayun, Muhammad;Fu, Qiuyun;Luo, Wei
近年来，贵金属修饰光催化材料因其在能源转化和环境修复等方面的特殊应用而备受关注。本文首次通过离子液体和原位光还原法制备了Au修饰的磷掺杂石墨化碳氮化碳（Au/P-CN）光催化剂。合成的光催化剂具有明显的可见光活性，有利于水裂解，使H-2和CO2转化为CH4。Au/P-CN光催化剂上H-2的析出量为97 μ mol，比裸CN （8 μ mol）提高了12倍。同样，Au/P-CN光催化剂上CH4的产生量为24 μ mol，比裸CN（4羊毛）提高了约6倍。在λ = 420 nm处，计算得到的H-2演化和CH4生成的量子效率分别接近3.60%和2.83%。优异的光催化活性归因于通过掺杂剂诱导的表面态和良好修饰的金纳米粒子扩大了可见光吸收和改善了载流子分离。这项工作表明，金修饰的cn基光催化剂在可见光照射下的水裂解光催化中将H-2和CO2转化为CH4，具有很好的应用前景。
The noble metal decorated photocatalytic materials have received marvelous attention in recent decade owing to their exceptional applications in energy conversion and environmental remediation. Herein, we have successfully fabricated Au decorated phosphorus doped graphitic carbon nitride (Au/P-CN) photocatalyst for the first time via ionic liquid and in situ photo-reduction methods. The resultant photocatalyst exhibits significant visible light activities for water splitting to evolve H-2 and CO2 conversion to CH4. The amount of H-2 evolved over Au/P-CN photocatalyst is 97 mu mol, similar to 12-fold enhanced compared to that of the bare CN (8 mu mol). Similarly, the amount of CH4 produced over Au/P-CN photocatalyst is 24 mu mol, about 6-fold enhanced compared to that of the bare CN (4 wool). The calculated quantum efficiencies for H-2 evolution and CH4 production are similar to 3.60% and similar to 2.83%, respectively at lambda = 420 nm. The exceptional photocatalytic activities are attributed to the extended visible-light absorption and improved charge carriers separation via the dopant induced surface states and the well decorated Au nanoparticles. This work demonstrate that the Au decorated CN-based photocatalysts show promising applications in photocatalysis for water splitting to evolve H-2 and CO2 conversion to CH4 under visible-light irradiation.