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Graphitic Carbon Nitride Decorated with Nickel(II)-(3-Pyridyl) Benzimidazole Complexes and Pt Nanoparticles as a Cocatalyst for Photocatalytic Hydrogen Production from Water Splitting
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-11-01 , DOI: 10.1021/acsanm.0c01872 Miza Kombo 1, 2 , Han-Bao Chong 1 , Liu-Bo Ma 1 , Shafaq Sahar 1 , Xiao-Xiang Fang 1 , Tan Zhao 1 , Cong Ling 1 , Xiao-Jie Lu 1 , An-Wu Xu 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-11-01 , DOI: 10.1021/acsanm.0c01872 Miza Kombo 1, 2 , Han-Bao Chong 1 , Liu-Bo Ma 1 , Shafaq Sahar 1 , Xiao-Xiang Fang 1 , Tan Zhao 1 , Cong Ling 1 , Xiao-Jie Lu 1 , An-Wu Xu 1
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Graphitic carbon nitride (g-C3N4) is regarded as a promising and suitable photocatalyst in the progress of hydrogen evolution from water splitting by employing visible-light irradiation. Nevertheless, the fast recombination rate of charge carriers of g-C3N4 results in a low H2 production rate. In this work, a high efficiency type-II heterostructured photocatalyst is constructed by decorating nickel(II)-(3-pyridyl) benzimidazole (NPBIm) complexes and platinum as a cocatalyst of g-C3N4 nanosheets via the strategy of π–π interaction, and the interfacial charge transfer through g-C3N4/NPBIm interface is thus improved. The optimal sample with 6 wt % NPBIm loadings with visible-light irradiation (λ ≥ 420 nm) possesses a maximum H2 production rate of 46.97 μmol h–1, which is 3.5-fold higher than that of g-C3N4 alone (13.47 μmol h–1) with a quantum efficicency of 5.13% at 420 nm. Meanwhile, C3N4/6 wt % NPBIm hybrid nanocomposite exhibits good photocatalytic stability toward hydrogen production under visible-light irradiation, demonstrating that the type-II heterojunction photocatalyst has great potential in the practical applications. The separation and migration of photoinduced excitons are significantly enhanced between g-C3N4 and NPBIm nanosheets, as clearly revealed by photoluminescence (PL) spectra, time-resolved PL spectra, and photoelectrochemical results. Overall, this study could provide opportunity to design and develop other highly efficient type-II heterostructured photocatalyst for the enhancement of H2 evolution from H2O splitting under visible-light irradiation.
中文翻译：
镍（II）-（3-吡啶基）苯并咪唑配合物和铂纳米粒子修饰的石墨化氮化碳作为水分解光催化制氢的助催化剂
石墨状的氮化碳（gC 3 N 4）被认为是通过使用可见光照射从水分解产生氢的过程中有希望且合适的光催化剂。然而，gC 3 N 4的电荷载流子的快速重组速率导致低的H 2产生速率。在这项工作中，通过装饰π（π）相互作用策略装饰镍（II）-（3-吡啶基）苯并咪唑（NPBIm）配合物和铂作为gC 3 N 4纳米片的助催化剂，构建了高效的II型异质结构光催化剂。，以及通过gC 3 N 4的界面电荷转移/ NPBIm接口因此得到改善。具有可见光照射（λ≥420 nm）的NPBIm负载量为6 wt％的最佳样品的最大H 2产生速率为46.97μmolh –1，比单独的gC 3 N 4高3.5倍（13.47） μmolh –1）在420 nm下的量子效率为5.13％。同时，C 3 Ñ 4 /6重量％NPBIm混杂纳米复合物显示出良好的光催化朝向氢生产稳定性可见光照射下，这表明II型异质结的光催化剂具有在实际应用中的巨大潜力。光诱导激子的分离和迁移在gC 3之间显着增强N 4和NPBIm纳米片，通过光致发光（PL）光谱，时间分辨的PL光谱和光电化学结果清楚地揭示了这一点。总体而言，这项研究可以提供机会，设计和开发等高效II型异质结构的光催化剂H的增强2进化自H 2可见光照射下Ø分裂。
更新日期：2020-11-25
中文翻译：
镍（II）-（3-吡啶基）苯并咪唑配合物和铂纳米粒子修饰的石墨化氮化碳作为水分解光催化制氢的助催化剂
石墨状的氮化碳（gC 3 N 4）被认为是通过使用可见光照射从水分解产生氢的过程中有希望且合适的光催化剂。然而，gC 3 N 4的电荷载流子的快速重组速率导致低的H 2产生速率。在这项工作中，通过装饰π（π）相互作用策略装饰镍（II）-（3-吡啶基）苯并咪唑（NPBIm）配合物和铂作为gC 3 N 4纳米片的助催化剂，构建了高效的II型异质结构光催化剂。，以及通过gC 3 N 4的界面电荷转移/ NPBIm接口因此得到改善。具有可见光照射（λ≥420 nm）的NPBIm负载量为6 wt％的最佳样品的最大H 2产生速率为46.97μmolh –1，比单独的gC 3 N 4高3.5倍（13.47） μmolh –1）在420 nm下的量子效率为5.13％。同时，C 3 Ñ 4 /6重量％NPBIm混杂纳米复合物显示出良好的光催化朝向氢生产稳定性可见光照射下，这表明II型异质结的光催化剂具有在实际应用中的巨大潜力。光诱导激子的分离和迁移在gC 3之间显着增强N 4和NPBIm纳米片，通过光致发光（PL）光谱，时间分辨的PL光谱和光电化学结果清楚地揭示了这一点。总体而言，这项研究可以提供机会，设计和开发等高效II型异质结构的光催化剂H的增强2进化自H 2可见光照射下Ø分裂。
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