Near-Infrared Plasmonic-Enhanced Solar Energy Harvest for Highly Efficient Photocatalytic Reactions

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• 作者：Jiabin Cui ; Yongjia Li ; Lei Liu ; Lin Chen ; Jun Xu ; Jingwen Ma ; Gang Fang ; Enbo Zhu ; Hao Wu ; Lixia Zhao ; Leyu Wang ; Yu Huang
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：15
• 期：10
• 页码：6295-6301
• 全文大小：440K
• ISSN：1530-6992

文摘

We report a highly efficient photocatalyst comprised of Cu₇S₄@Pd heteronanostructures with plasmonic absorption in the near-infrared (NIR)-range. Our results indicated that the strong NIR plasmonic absorption of Cu₇S₄@Pd facilitated hot carrier transfer from Cu₇S₄ to Pd, which subsequently promoted the catalytic reactions on Pd metallic surface. We confirmed such enhancement mechanism could effectively boost the sunlight utilization in a wide range of photocatalytic reactions, including the Suzuki coupling reaction, hydrogenation of nitrobenzene, and oxidation of benzyl alcohol. Even under irradiation at 1500 nm with low power density (0.45 W/cm²), these heteronanostructures demonstrated excellent catalytic activities. Under solar illumination with power density as low as 40 mW/cm², nearly 80鈥?00% of conversion was achieved within 2 h for all three types of organic reactions. Furthermore, recycling experiments showed the Cu₇S₄@Pd were stable and could retain their structures and high activity after five cycles. The reported synthetic protocol can be easily extended to other Cu₇S₄@M (M = Pt, Ag, Au) catalysts, offering a new solution to design and fabricate highly effective photocatalysts with broad material choices for efficient conversion of solar energy to chemical energy in an environmentally friendly manner.