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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ag_2S/g-C_3N_4 composite photocatalysts for efficient Pt-free hydrogen production. The co-catalyst function of Ag/Ag_2S formed by simultaneous photodeposition
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Ag_2S/g-C_3N_4 composite photocatalysts for efficient Pt-free hydrogen production. The co-catalyst function of Ag/Ag_2S formed by simultaneous photodeposition

机译：Ag_2S / g-C_3N_4复合光催化剂可有效生产无铂氢气。通过同时光沉积形成的Ag / Ag_2S的助催化剂功能

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摘要

Without Pt as cocatalyst, the photocatalytic hydrogen evolution activity of graphitic carbon nitride (g-C_3N_4) or even its composite is normally rather low (<1 μmol h~(-1)). Exploring Pt-free cocatalysts to substitute precious Pt is of great importance in the photocatalytic field. In the present work, Ag_2Smodified g-C_3N_4 (Ag_2S/g-C_3N_4) composite photocatalysts were prepared via a simple precipitation method. The results demonstrated that the photocatalytic H_2-production activity of g-C_3N_4 can be remarkably increased by the combination of Ag_2S. The optimal Ag_2S loading was found to be 5 wt%, giving a H_2 production of 10 μmol h~(-1), around 100 times that of pure g-C_3N_4. The enhanced photocatalytic activity can be mainly attributed to the effective charge transfer between g-C_3N_4 and Ag/Ag_2S, of which the latter is formed by simultaneous photodeposition in the photocatalytic H_2 evolution reaction and acts as an efficient co-catalyst for the g-C_3N_4. This work showed the possibility for utilization of Ag_2S or Ag/Ag_2S as a substitute for Pt in the photocatalytic production of H_2 using g-C_3N_4.
机译：没有Pt作为助催化剂，石墨氮化碳（g-C_3N_4）甚至其复合物的光催化氢释放活性通常相当低（<1μmolh〜（-1））。在光催化领域，探索无铂助催化剂替代珍贵的铂是非常重要的。本文通过简单的沉淀法制备了Ag_2S改性的g-C_3N_4（Ag_2S / g-C_3N_4）复合光催化剂。结果表明，Ag_2S的组合可以显着提高g-C_3N_4的光催化H_2的产生活性。发现最佳的Ag_2S负载为5wt％，产生的H_2产量为10μmolh〜（-1），约为纯g-C_3N_4的100倍。增强的光催化活性主要归因于g-C_3N_4与Ag / Ag_2S之间的有效电荷转移，其中后者是通过在光催化H_2析出反应中同时进行光沉积而形成的，并充当g-C_3N_4的有效助催化剂。这项工作表明在使用g-C_3N_4光催化生产H_2时，有可能利用Ag_2S或Ag / Ag_2S代替Pt。

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