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Suspensible Cubic-Phase CdS Nanocrystal Photocatalyst: Facile Synthesis and Highly Efficient H2-Evolution Performance in a Sulfur-Rich System
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-03-15 00:00:00 , DOI: 10.1021/acssuschemeng.8b00398 Huogen Yu 1, 2 , Wei Zhong 2 , Xiao Huang 2 , Ping Wang 2 , Jiaguo Yu 3
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-03-15 00:00:00 , DOI: 10.1021/acssuschemeng.8b00398 Huogen Yu 1, 2 , Wei Zhong 2 , Xiao Huang 2 , Ping Wang 2 , Jiaguo Yu 3
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Compared with stable-phase hexagonal CdS, the metastable cubic CdS photocatalyst usually shows a lower H2-evolution performance under visible-light irradiation. Thus, the widely reported high-performance CdS photocatalysts are mainly focused on the hexagonal phase, while the cubic-phase CdS with a high H2-evolution activity has seldom been concerned. In this study, a direct precipitation method in a sulfur-rich Na2S–Na2SO3 system has been developed to prepare the suspensible cubic-phase CdS nanocrystal (c-CdS-NC) photocatalyst with a high H2-evolution activity. In this case, the resultant c-CdS-NC with a small crystal size (ca. 5 nm) and high specific surface area (>75.23 m2/g) exhibits a stable and suspensible photocatalysts due to the massive and preferential adsorption of S2–/SO32– ions on the nanocrystal surface. Photocatalytic results indicated that the suspensible c-CdS-NC photocatalysts clearly exhibited an obviously higher H2-evolution performance (0.36 mmol h–1) than the traditional hexagonal CdS (0.14 mmol h–1) by a factor of 2.6 times. Based on the present results, a S2–/SO32–-mediated mechanism was proposed for the enhanced H2-evolution performance of the suspensible c-CdS-NC, namely the massive adsorbed S2– ions on the suspensible c-CdS-NC surface not only promote the rapid capture of photogenerated holes but also can work as the effective active sites for H2-evolution reaction. The present work may provide important insights for developing high-performance photocatalytic materials.
中文翻译：
悬浮相CdS纳米晶光催化剂：富硫体系中的简便合成和高效H 2演化性能
与稳定相六角形CdS相比，亚稳态立方CdS光催化剂在可见光照射下通常表现出较低的H 2演化性能。因此，广泛报道的高性能CdS光催化剂主要集中在六方相上，而很少关注具有高H 2释放活性的立方相CdS 。在这项研究中，开发了一种在富硫的Na 2 S–Na 2 SO 3系统中的直接沉淀方法，以制备具有高H 2释放活性的可悬浮立方相CdS纳米晶体（c -CdS-NC）光催化剂。。在这种情况下，结果c-CdS-NC具有较小的晶体尺寸（约5 nm）和高的比表面积（> 75.23 m 2 / g），由于S 2– / SO 3 2–的大量吸附和优先吸附，显示出稳定且可悬浮的光催化剂。离子在纳米晶体表面上。光催化结果表明，悬浮的c -CdS-NC光催化剂明显表现出比传统的六边形CdS（0.14 mmol h –1）高2的H 2演化性能（0.36 mmol h –1），高出2.6倍。根据目前的结果，提出了一种由S 2- / SO 3 2-介导的增强H 2的机制。c -CdS-NC的快速演化性能，即在c -CdS-NC悬浮表面上大量吸附的S 2-离子不仅促进了光生空穴的快速捕获，而且还可以作为H 2的有效活性位点-进化反应。本工作可能为开发高性能光催化材料提供重要的见识。
更新日期：2018-03-15
中文翻译：
悬浮相CdS纳米晶光催化剂：富硫体系中的简便合成和高效H 2演化性能
与稳定相六角形CdS相比，亚稳态立方CdS光催化剂在可见光照射下通常表现出较低的H 2演化性能。因此，广泛报道的高性能CdS光催化剂主要集中在六方相上，而很少关注具有高H 2释放活性的立方相CdS 。在这项研究中，开发了一种在富硫的Na 2 S–Na 2 SO 3系统中的直接沉淀方法，以制备具有高H 2释放活性的可悬浮立方相CdS纳米晶体（c -CdS-NC）光催化剂。。在这种情况下，结果c-CdS-NC具有较小的晶体尺寸（约5 nm）和高的比表面积（> 75.23 m 2 / g），由于S 2– / SO 3 2–的大量吸附和优先吸附，显示出稳定且可悬浮的光催化剂。离子在纳米晶体表面上。光催化结果表明，悬浮的c -CdS-NC光催化剂明显表现出比传统的六边形CdS（0.14 mmol h –1）高2的H 2演化性能（0.36 mmol h –1），高出2.6倍。根据目前的结果，提出了一种由S 2- / SO 3 2-介导的增强H 2的机制。c -CdS-NC的快速演化性能，即在c -CdS-NC悬浮表面上大量吸附的S 2-离子不仅促进了光生空穴的快速捕获，而且还可以作为H 2的有效活性位点-进化反应。本工作可能为开发高性能光催化材料提供重要的见识。
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