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首页> 外文期刊>Catalysis science & technology >One-pot fabrication of 2D/2D HCa2Nb3O10/g-C(3)N(4)type II heterojunctions towards enhanced photocatalytic H(2)evolution under visible-light irradiation
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One-pot fabrication of 2D/2D HCa2Nb3O10/g-C(3)N(4)type II heterojunctions towards enhanced photocatalytic H(2)evolution under visible-light irradiation

机译：锅制作2 d / 2 dHCa2Nb3O10 / g c N (3) (4) II型垂直对增强光催化H(2)进化可见光照射下

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Design of 2D/2D photocatalysts with strong interfacial interactionviaabundant 2D coupling interfaces has been proved to be an efficient strategy to promote photocatalytic performance. Herein, colloidal suspensions containing HCa(2)Nb(3)O(10)nanosheets (HCNO) and dicyandiamide were adopted as feed reagents, based on which 2D/2D HCa(2)Nb(3)O(10)nanosheet/g-C(3)N(4)composites (HCNO/CN) with efficient photocatalytic activities were synthesized by a facile one-pot method. By this way, the separation process of HCa(2)Nb(3)O(10)nanosheets was eliminated and the effective heterojunction formed simultaneously. The optimal visible light-driven photocatalytic H-2-evolution activity of the composite photocatalysts was 4.5 times that of pristine g-C3N4(CN), and the enhanced photocatalytic activities were attributed to the following aspects. On the one hand, the large 2D contact interfaces and the matched energy bands resulted in an efficient type II heterojunction and it thus could accelerate the separation and transfer of photo-generated electron-hole pairs. On the other hand, the residual tetrabutylammonium hydroxide on HCNO obviously changed the structure of g-C(3)N(4)by thein situpyrolysis strategy, thus enhancing the light absorption, narrowing the bandgap and enlarging the specific surface area and pore volume of g-C3N4. This work presents an effective and convenient route to construct 2D/2D composite photocatalysts based on layered perovskite nanosheets and/or g-C(3)N(4)nanosheets, by which the compositions and microstructures of the composites were optimized simultaneously during the pyrolysis process.
机译：2 d / 2 d设计与强大的催化剂界面interactionviaabundant二维耦合接口已经被证明是有效的策略来促进光催化性能。在此,胶体悬浮液含HCa (2) Nb (3) O (10) nanosheets (HCNO)和双氰胺作为饲料的试剂,基于2 d / 2 dHCa (2) Nb (3) O (10) nanosheet / g c N(3)(4)复合材料与高效光催化(HCNO / CN)活动是合成的锅方法。HCa (2) Nb (3) O (10) nanosheets消除,同时有效形成异质结。最优可见light-driven光催化H-2-evolution组合的活动催化剂是原始的4.5倍g-C3N4 (CN),增强光催化活动是归因于以下方面。接口和能量匹配的乐队了在一个高效的II型异质结和因此可能会加速分离和转移的photo-generated电子空穴对。另一方面,剩余四丁铵氢氧化HCNO显然改变了结构g c (3) N(4)通过登situpyrolysis策略,从而提高光吸收、缩小隙和放大特定的表面g-C3N4面积和孔隙体积。提出了一种有效和方便的途径构造复合催化剂基于2 d / 2 d层状钙钛矿nanosheets和/或g c (3) N (4) nanosheets的成分和复合材料的微观结构同时在热解进行了优化的过程。

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