Monoclinic Porous BiVO4 Networks Decorated by Discrete g-C3N4 Nano-Islands with Tunable Coverage for Highly Efficient Photocatalysis
Monoclinic Porous BiVO4 Networks Decorated by Discrete g-C3N4 Nano-Islands with Tunable Coverage for Highly Efficient Photocatalysis
复制标题
由离散 g-C3N4 纳米岛装饰的单斜多孔 BiVO4 网络，具有可调覆盖范围，可实现高效光催化
DOI：
10.1002/smll.201400506
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发表时间：
2014-07-23
期刊：
影响因子：
13.3
通讯作者：
Gong, Jinlong
中科院分区：
文献类型：
--
作者：
Li, Changjiang;Wang, Shengping;Gong, Jinlong
在CdS/gC 3 N4纳米线中，通过将CdS核的尖端暴露于溶液中，可以有效地实现两相的协同效应，从而进一步提高光催化活性。[8]此外，Li和同事们已经很好地证明了表面金红石/金红石相结的形成，其中金红石和金红石相同时暴露于电解质，是TiO 2纳米颗粒的光催化活性提高的原因。当金红石被金红石完全覆盖时，观察到光催化活性降低，消除了暴露的表面金红石/金红石相结。[9]此外，已经发现异质结光催化剂中良好分离的反应位点对于提高光活性也是至关重要的。[10]基于上述发现，异质结构系统中可控的表面覆盖对于实现高效的光催化非常重要。单斜钒酸铋（m-BiVO 4）具有良好的可见光响应性、化学稳定性、无毒性以及较高的光催化分解水和降解有机物的活性，近年来引起了人们的广泛关注。[11]为了克服纯BiVO 4的电荷传输特性差、比表面积小、表面吸附能力弱等缺点，人们进行了大量的努力（如异质结构建和元素掺杂）。[12]此外，多孔材料（如BiVO 4）的设计也是一个研究热点. [13]例如，Zou等人证明了多孔m-BiVO 4在电荷分离方面比本体对应物更有效。[14]最近，Choi等人成功地将多孔BiVO 4应用于太阳能水分解。[15]石墨氮化碳（gC 3 N4）具有良好的化学稳定性和光催化活性。[16]由于gC 3 N4的电荷输运能力差，导致其快速电荷复合，因此人们广泛构建了基于体相gC 3 N4的异质结光催化剂。[5d然而，基于纳米尺寸的gC 3 N4的异质结光催化剂，可以减少从体到表面的电荷传输距离，很少被探索。
CdS/gC 3N 4 nanowires, exposing the tip of core (CdS) to the solution was necessary to achieve efficient synergic effects of the two phases, which can further enhance the photocatalytic activity.[8] Also, Li and co-workers have nicely demonstrated that the formation of surface anatase/rutile phase junction, where anatase and rutile phases are exposed to the electrolyte simultaneously, is responsible for the elevated photocatalytic activity of TiO 2 nanoparticles. A decreased photocatalytic activity was observed when rutile was completely covered by anatase, eliminating the exposed surface anatase/rutile phase junction.[9] Furthermore, it has been found that well separated reaction sites in heterojunction photocatalysts are also critical to improve the photo-activities.[10] Based on aforementioned findings, a controllable surface coverage in the heterostructured systems is significantly important to achieve efficient photocatalysis. However, it is still a great challenge to develop a reliable methodology to control the surface coverage to optimize the activity of heterojunction photocatalysts.Monoclinic bismuth vanadate (m-BiVO 4) has attracted numerous attention for its excellent visible light response, chemical stability, nontoxicity as well as relatively high photo catalytic activity for water splitting and degradation of organic compounds.[11] Great efforts (such as heterojunction construction and element doping) have been made to overcome the poor charge transport characteristics, small specific surface area and weak surface adsorption ability of pure BiVO 4.[12] Additionally, designing of porous materials (such as BiVO 4) has also been a hot area of research.[13] For example, Zou et al. proved that porous m-BiVO 4 was more efficient in charge separation than the bulk counterpart.[14] Recently, Choi et al. has elegantly applied porous BiVO 4 for solar water splitting.[15] Furthermore, graphitic carbon nitride (gC 3N 4) possesses good chemical stability and photocatalytic activities.[16] Heterojunction photocatalysts based on bulk gC 3N 4 have been widely constructed to reduce the fast charge recombination of gC 3N 4, which is caused by its poor charge transport ability.[5d, 17] However, heterojunction photocatalyst based on nano-sized gC 3N 4 that can reduce charge transport distance from bulk to surface has rarely been explored.