Photocatalytic Carbon Dioxide Reduction by Copper Oxide Nanocluster-Grafted Niobate Nanosheets
Photocatalytic Carbon Dioxide Reduction by Copper Oxide Nanocluster-Grafted Niobate Nanosheets
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DOI：
10.1021/nn507429e
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发表时间：
2015-02-01
期刊：
影响因子：
17.1
通讯作者：
Miyauchi, Masahiro
中科院分区：
文献类型：
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作者：
Yin, Ge;Nishikawa, Masami;Miyauchi, Masahiro
无定形氧化铜（Cu（II））纳米团簇作为有效的电催化剂用于将二氧化碳（CO2）还原成一氧化碳（CO）。除了促进电催化活性外，Cu（II）纳米团簇在接枝到半导体（光收集器）的表面上时还充当用于CO2光还原的有效的助催化剂，例如铌酸盐（Nb 3 O 8）纳米片。在这里，Cu（II）接枝Nb 3 O 8纳米片的光催化活性和反应途径进行了研究，使用电子自旋共振（ESR）分析和同位素标记的分子（H218 O和（CO2）-C-13）。标记实验的结果表明，在紫外线照射下，从水中提取电子以产生氧（O-18（2）），然后还原CO2以产生（CO）-C-13。ESR分析证实Nb 3 O 8纳米片的价带中的激发空穴与水反应，Nb_3 O_8纳米片导带中的激发电子通过界面注入到Cu（II）纳米团簇中，参与了CO_2还原为CO的反应。接枝的Nb 3 O 8纳米片由无毒、丰富的元素组成，可以通过湿化学方法容易地合成。这里描述的纳米团簇接枝技术可以应用于各种半导体光收集器（例如金属氧化物和/或金属硫属化物）的表面活化，并且预期有助于开发有效的CO2光还原系统。
Amorphous copper oxide (Cu(II)) nanoclusters function as efficient electrocatalysts for the reduction of carbon dioxide (CO2) to carbon monoxide (CO). In addition to promoting electrocatalytic activity, Cu(II) nanoclusters act as efficient cocatalyts for CO2 photoreduction when grafted onto the surface of a semiconductor (light harvester), such as niobate (Nb3O8) nanosheets. Here, the photocatalytic activity and reaction pathway of Cu(II)-grafted Nb3O8 nanosheets was investigated using electron spin resonance (ESR) analysis and isotope-labeled molecules (H218O and (CO2)-C-13). The results of the labeling experiments demonstrated that under UV irradiation, electrons are extracted from water to produce oxygen (O-18(2)) and then reduce CO2 to produce (CO)-C-13. ESR analysis confirmed that excited holes in the valence band of Nb3O8 nanosheets react with water, and that excited electrons in the conduction band of Nb3O8 nanosheets are injected into the Cu(II) nanoclusters through the interface and are involved in the reduction of CO2 into CO. The Cu(II) nanocluster-grafted Nb3O8 nanosheets are composed of nontoxic and abundant elements and can be facilely synthesized by a wet chemical method. The nanocluster grafting technique described here can be applied for the surface activation of various semiconductor light harvesters, such as metal oxide and/or metal chalcogenides, and is expected to aid in the development of efficient CO2 photoreduction systems.