Essential roles of defects in pure graphene/Cu2O photocatalyst

Essential roles of defects in pure graphene/Cu2O photocatalyst
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缺陷在纯石墨烯/Cu2O光催化剂中的重要作用

DOI:
10.1016/j.catcom.2015.12.013
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发表时间:
2016-02
影响因子:
3.7
通讯作者:
Luo Zhengtang
Luo Zhengtang
中科院分区:
化学3区
文献类型:
--
作者:
Zhang Dianmin;Hu Baoshan;Guan Dongjie;Luo Zhengtang

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采用化学气相沉积(CVD)法制备了不同缺陷丰度的纯石墨烯薄片,成功地制备了石墨烯/Cu2O复合材料,用于可见光催化降解甲基橙(MO)。结果表明,石墨烯的催化活性强烈依赖于片状石墨烯中缺陷的丰度。在光照30min时,酶活最高,达80.10%。此外,我们还证明了石墨烯中的缺陷有助于在石墨烯和Cu2O之间建立有效的界面,从而缩小原始Cu2O半导体的带隙,抑制光生电子-空穴对的复合。
The pure graphene flakes with different abundance of defects were synthesized by CVD method to successfully prepare the graphene/Cu2O composites for the photocatalytic degradation of methyl orange (MO) under visible light irradiation. The results illustrate that catalytic activity was strongly dependent on the abundance of defects in graphene flakes. The highest activity was measured to be 80.10% in 30 min light irradiation. Furthermore, we demonstrate that the defects in graphene could facilitate to construct an efficient interface between graphene and Cu2O for narrowing the band gap of original Cu2O semiconductor and inhibiting the recombination of photo-generated electron–hole pairs.
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