Reduced graphene oxide-TiO2 nanocomposite as a promising visible-light-active photocatalyst for the conversion of carbon dioxide.
Reduced graphene oxide-TiO2 nanocomposite as a promising visible-light-active photocatalyst for the conversion of carbon dioxide.
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DOI：
10.1186/1556-276x-8-465
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发表时间：
2013-11-06
影响因子：
--
通讯作者：
Mohamed AR
中科院分区：
文献类型：
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作者：
Tan LL;Ong WJ;Chai SP;Mohamed AR
将二氧化碳（CO2）光催化还原成烃燃料（如甲烷）是同时收获太阳能和捕获这种主要温室气体的有吸引力的策略。石墨烯基半导体纳米复合材料作为光催化剂具有广泛的应用前景。在这项工作中，还原氧化石墨烯（rGO）-二氧化钛杂化纳米晶体的制备通过一种新的和简单的溶剂热合成路线。平均直径为12 nm的锐钛矿TiO 2颗粒均匀分散在rGO片上。通过使用乙二醇和乙酸的混合溶剂以及附加的冷却步骤，成功地实现了缓慢水解反应。制备的rGO-TiO 2纳米复合材料在氧化石墨和纯石墨上还原CO2时表现出上级的光催化活性（0.135 μmol gcat−1 h−1）。TiO 2和rGO之间的紧密接触被提出来加速TiO 2上的光生电子向rGO的转移，导致有效的电荷抗复合，从而提高光催化活性。此外，我们的光催化剂即使在低功率节能灯泡的照射下也具有活性，这使得整个过程在经济上和实际上都是可行的。
Photocatalytic reduction of carbon dioxide (CO2) into hydrocarbon fuels such as methane is an attractive strategy for simultaneously harvesting solar energy and capturing this major greenhouse gas. Incessant research interest has been devoted to preparing graphene-based semiconductor nanocomposites as photocatalysts for a variety of applications. In this work, reduced graphene oxide (rGO)-TiO2 hybrid nanocrystals were fabricated through a novel and simple solvothermal synthetic route. Anatase TiO2 particles with an average diameter of 12 nm were uniformly dispersed on the rGO sheet. Slow hydrolysis reaction was successfully attained through the use of ethylene glycol and acetic acid mixed solvents coupled with an additional cooling step. The prepared rGO-TiO2 nanocomposites exhibited superior photocatalytic activity (0.135 μmol gcat−1 h−1) in the reduction of CO2 over graphite oxide and pure anatase. The intimate contact between TiO2 and rGO was proposed to accelerate the transfer of photogenerated electrons on TiO2 to rGO, leading to an effective charge anti-recombination and thus enhancing the photocatalytic activity. Furthermore, our photocatalysts were found to be active even under the irradiation of low-power energy-saving light bulbs, which renders the entire process economically and practically feasible.