Reduced graphene oxide-CuO nanocomposites for photocatalytic conversion of CO2 into methanol under visible light irradiation
Reduced graphene oxide-CuO nanocomposites for photocatalytic conversion of CO2 into methanol under visible light irradiation
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DOI：
10.1016/j.apcatb.2015.08.012
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发表时间：
2016-02-01
影响因子：
22.1
通讯作者：
Khatri, Om P.
中科院分区：
文献类型：
--
作者：
Gusain, Rashi;Kumar, Pawan;Khatri, Om P.
通过在还原氧化石墨烯（rGO）骨架上共价接枝氧化铜纳米棒，制备了rGO-氧化铜纳米复合材料。通过FTIR、XPS、XRD和HRTEM分析，探讨了rGO-CuO纳米复合材料的化学和结构特征。探讨了rGO-CuO纳米复合材料在可见光照射下对CO2还原为甲醇的光催化潜力。系统地改变了rGO-CuO/Cu 2 O纳米复合材料中CuO纳米棒的宽度和Cu的氧化态，以研究其光催化活性。原始的CuO纳米棒由于电荷载流子的快速复合而表现出非常低的光催化活性，并产生175 μ mol g（-1）甲醇，而rGO-CuO 2 O和rGO-CuO表现出显著改善的光催化活性，并分别产生5倍（862 μ mol g（-1））和7倍（1228 μ mol g（-1））甲醇。rGO-CuO纳米复合材料中CuO的上级光催化活性归因于载流子的缓慢复合和光生电子通过rGO骨架的有效转移。本研究进一步排除了清除供体的使用。(C)2015 Elsevier B. V.版权所有。
Reduced graphene oxide (rGO)-copper oxide nanocomposites are prepared by covalent grafting of CuO nanorods on the rGO skeleton. Chemical and structural features of rGO-CuO nanocomposites are probed by FTIR, XPS, XRD and HRTEM analyses. Photocatalytic potential of rGO-CuO nanocomposites is explored for reduction of CO2 into the methanol under the visible light irradiation. The breadth of CuO nanorods and the oxidation state of Cu in the rGO-CuO/Cu2O nanocomposites are systematically varied to investigate their photocatalytic activities. The pristine CuO nanorods exhibited very low photocatalytic activity owing to fast recombination of charge carriers and yielded 175 mu mol g(-1) methanol, whereas rGO-Cu2O and rGO-CuO exhibited significantly improved photocatalytic activities and yielded five (862 mu mol g(-1)) and seven (1228 mu mol g(-1)) folds methanol, respectively. The superior photocatalytic activity of CuO in the rGO-CuO nanocomposites was attributed to slow recombination of charge carriers and efficient transfer of photo-generated electrons through the rGO skeleton. This study further excludes the use of scavenging donor. (C) 2015 Elsevier B.V. All rights reserved.