The photocatalytic hydrogen evolution (PHE) activity of pristine graphitic carbon nitride (GCN) and highly crystalline K-doped GCN can significantly be enhanced under visible light irradiation via adding alkali metal salt into their PHE reaction solution. As manifested in XRD, UVDRS, TEM and XPS measurements, the loading amount of Pt cocatalyst on both GCN and K-doped GCN, as well as the content of metallic Pt were greatly increased in the presence of 1.0 M KCl solution in the photoreduction solution. More significantly, the proportion of metallic Pt reached around 75 %. As a result, the PHE rate of K-doped GCN was even as high as 11 mmol hg under visible light irradiation. The current work offers a simple and cost-efficient strategy to promote the low depositing efficiency of Pt cocatalyst by traditional photoreduction method, thereby increasing the PHE activity of GCN and GCN based materials.

中文翻译：

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盐促进石墨碳氮化物上的金属 Pt 光沉积，以实现高效光催化析氢


通过在PHE反应溶液中添加碱金属盐，原始石墨氮化碳（GCN）和高结晶K掺杂GCN的光催化析氢（PHE）活性在可见光照射下可以显着增强。 XRD、UVDRS、TEM 和 XPS 测量表明，光还原溶液中存在 1.0 M KCl 溶液时，GCN 和 K 掺杂 GCN 上 Pt 助催化剂的负载量以及金属 Pt 的含量均大大增加。更重要的是，金属Pt的比例达到了75%左右。结果，K掺杂GCN的PHE率在可见光照射下甚至高达11 mmol hg。目前的工作提供了一种简单且具有成本效益的策略，通过传统的光还原方法来提高 Pt 助催化剂的低沉积效率，从而提高 GCN 和 GCN 基材料的 PHE 活性。