Jiangsu Collaborative Innovation Center, of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, P. R. China.
Chemistry. 2018 Oct 22;24(59):15930-15936. doi: 10.1002/chem.201803621. Epub 2018 Sep 24.
Photocatalytic hydrogen evolution technology is recognized as a promising approach to relieving the growing energy crisis. Therefore, the development of a stable high-performance photocatalyst has long been the focus of research. In this work, quaternary composite materials involving a snowflake-like CdS nanocrystal wrapped by different amounts of polyoxometalate-decorated g-C N and polypyrrole (GPP@CdS) have been synthesized as photocatalysts for hydrogen production under visible-light irradiation. It has been revealed that the best composite (40 % GPP@CdS composite) exhibits hydrogen production activity of 1321 μmol, which exceeds that of CdS by a factor of more than two, and can be used in at least seven cycles with negligible loss of activity. The enhanced photocatalytic performance has been primarily attributed to the efficient synergy of CdS, g-C N , polypyrrole (PPy), and the polyoxometalate Ni (PW ) . It should be noted that the introduction of PPy and g-C N into the title composite simultaneously promotes electron/hole pair separation and photocatalytic stability, whereas Ni (PW ) serves as an efficient electron modulator and extra catalytic active site.
光催化制氢技术被认为是缓解日益严重的能源危机的一种有前途的方法。因此，开发稳定的高性能光催化剂一直是研究的重点。在这项工作中，我们合成了涉及不同数量的多酸修饰的 g-C N 和聚吡咯（GPP@CdS）包裹的雪花状 CdS 纳米晶体的四元复合材料，作为可见光照射下制氢的光催化剂。结果表明，最佳复合（40% GPP@CdS 复合）的制氢活性为 1321 μmol，是 CdS 的两倍以上，可以在至少七个循环中使用，活性损失可忽略不计。增强的光催化性能主要归因于 CdS、g-C N 、聚吡咯（PPy）和多酸 Ni（PW）之间的有效协同作用。值得注意的是，将 PPy 和 g-C N 引入标题复合材料中同时促进了电子/空穴对的分离和光催化稳定性，而 Ni（PW）则充当了有效的电子调节剂和额外的催化活性位点。
