Through direct addition of inorganic zinc ions into the solution of indium phosphide quantum dots (InP QDs) at ambient environment, we here present a facile but effective method to modify InP QDs for photocatalytic hydrogen evolution from hydrogen sulfide (H2S). X-ray diffraction patterns and transmission electron microscopic images demonstrate that zinc ions have no significant influence on the crystal structure and morphology of InP QDs, while X-ray photoemission spectra and UV-Vis diffuse and reflectance spectra indicate that zinc ions mainly adsorbed on the surface of InP QDs. Photocatalytic results show the average hydrogen evolution rate has been enhanced to 2.9 times after modification and H2S has indeed involves in the hydrogen evolution process. Steady-state and transient photoluminescence spectra prove that zinc ions could effectively eliminate the surface traps on InP QDs, which is crucial to suppress the recombination of charge carriers. In addition, the electrostatic interaction between zinc ions and the surface sulfide from InP QDs could mitigate the repulsion between QDs and sulfide/hydrosulfide, which may promote the surface oxidative reaction during photocatalysis. This work avoids the traditional harsh and complicated operations required for surface passivation of QDs, which offers a convenient way for optimization of QDs in photocatalysis.

中文翻译：

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锌离子修饰的InP量子点可增强硫化氢光催化制氢的能力。

通过在环境中将无机锌离子直接添加到磷化铟量子点（InP QDs）溶液中，我们在这里提出了一种简便而有效的方法来修饰InP QDs，以从硫化氢（H2S）光催化制氢。X射线衍射图谱和透射电子显微镜图像表明，锌离子对InP量子点的晶体结构和形态没有显着影响，而X射线光发射光谱和UV-Vis扩散和反射光谱表明，锌离子主要吸附在InP量子点上。 InP QD的表面。光催化结果表明，改性后平均析氢速率提高到2.9倍，并且H2S确实参与了析氢过程。稳态和瞬态光致发光光谱证明，锌离子可以有效消除InP量子点上的表面陷阱，这对于抑制电荷载流子的复合至关重要。另外，锌离子与InP量子点表面的硫化物之间的静电相互作用可以减轻量子点与硫化物/氢硫化物之间的排斥，从而促进光催化过程中的表面氧化反应。这项工作避免了QD表面钝化所需的传统苛刻和复杂的操作，从而为优化光催化中的QD提供了方便的方法。锌离子与InP量子点表面的硫化物之间的静电相互作用可以减轻量子点与硫化物/氢硫化物之间的排斥，从而促进光催化过程中的表面氧化反应。这项工作避免了QD表面钝化所需的传统苛刻和复杂的操作，从而为优化光催化中的QD提供了方便的方法。锌离子与InP量子点表面的硫化物之间的静电相互作用可以减轻量子点与硫化物/氢硫化物之间的排斥，从而促进光催化过程中的表面氧化反应。这项工作避免了QD表面钝化所需的传统苛刻和复杂的操作，从而为优化光催化中的QD提供了方便的方法。