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Ag2S Quantum Dots as an Infrared Excited Photocatalyst for Hydrogen Production
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-03-12 00:00:00 , DOI: 10.1021/acsaem.9b00091
Weili Yu 1 , Jun Yin , Yuan Li , Bo Lai 2 , Tong Jiang 3 , Yangyang Li 4 , Huiwen Liu 5 , Jiale Liu 5 , Chen Zhao 1 , Subhash C. Singh 2 , Jingsheng Chen 4 , Bin Lin 6 , Hicham Idriss 7 , Chunlei Guo 1, 2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-03-12 00:00:00 , DOI: 10.1021/acsaem.9b00091
Weili Yu 1 , Jun Yin , Yuan Li , Bo Lai 2 , Tong Jiang 3 , Yangyang Li 4 , Huiwen Liu 5 , Jiale Liu 5 , Chen Zhao 1 , Subhash C. Singh 2 , Jingsheng Chen 4 , Bin Lin 6 , Hicham Idriss 7 , Chunlei Guo 1, 2
Affiliation
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H2 production using nanoscale semiconductors via photocatalytic water splitting is a much sought-after technology to curb carbon dioxide emission. Among the many challenges found to date is the search for a stable semiconductor photocatalyst responding to visible and preferably visible and IR light. Ag2S is a narrow bandgap semiconductor with a bulk electronic gap smaller than that needed to split water. In this work, using a solvent thermal strategy, we have increased its bandgap energy by shifting up the conduction band edge to make it suitable for the electron transfer reaction to hydrogen ions. The Ag2S quantum dots (QDs) were tested as both electrocatalysts and photocatalysts. As electrocatalysts, Ag2S QDs with an absorption peak at 800 nm (QD800) showed the highest H2 evolution activity with a Tafel slope of 89 mV/dec with an overpotential of 0.32 V. As photocatalysts, H2 was produced at a rate of 858 μmol h–1 gcatal–1 under a white light flux of 100 mW cm–2. Moreover, QD800 was also found to be active under only near-infrared excitation (800 ± 20 nm). This is the longest wavelength reported so far to excite a semiconductor and generate H2.
中文翻译：
Ag 2 S量子点作为制氢的红外激发光催化剂
使用纳米级半导体通过光催化水分解生产H 2是一种广受欢迎的抑制二氧化碳排放的技术。迄今为止发现的许多挑战之一是寻找对可见光，优选可见光和IR光有响应的稳定的半导体光催化剂。Ag 2 S是一种窄带隙半导体，其电子间隙小于分解水所需的电子间隙。在这项工作中，我们采用溶剂热策略，通过上移导带边缘来增加其带隙能量，使其适合电子转移至氢离子的反应。测试了Ag 2 S量子点（QDs）作为电催化剂和光催化剂。作为电催化剂，Ag 2S量子点具有800 nm的吸收峰（QD800），具有最高的H 2析出活性，Tafel斜率为89 mV / dec，过电势为0.32V。作为光催化剂，H 2的产生速率为858μmolh –在100 mW cm –2的白光通量下1 g阴极–1。此外，还发现QD800仅在近红外激发（800±20 nm）下才有活性。这是迄今为止报道的激发半导体并产生H 2的最长波长。
更新日期：2019-03-12
中文翻译：
Ag 2 S量子点作为制氢的红外激发光催化剂
使用纳米级半导体通过光催化水分解生产H 2是一种广受欢迎的抑制二氧化碳排放的技术。迄今为止发现的许多挑战之一是寻找对可见光，优选可见光和IR光有响应的稳定的半导体光催化剂。Ag 2 S是一种窄带隙半导体，其电子间隙小于分解水所需的电子间隙。在这项工作中，我们采用溶剂热策略，通过上移导带边缘来增加其带隙能量，使其适合电子转移至氢离子的反应。测试了Ag 2 S量子点（QDs）作为电催化剂和光催化剂。作为电催化剂，Ag 2S量子点具有800 nm的吸收峰（QD800），具有最高的H 2析出活性，Tafel斜率为89 mV / dec，过电势为0.32V。作为光催化剂，H 2的产生速率为858μmolh –在100 mW cm –2的白光通量下1 g阴极–1。此外，还发现QD800仅在近红外激发（800±20 nm）下才有活性。这是迄今为止报道的激发半导体并产生H 2的最长波长。
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