National & Local United Engineering Laboratory for Power Batteries, Key Laboratory of Polyoxometalate Science of Ministry of Education Department of Chemistry, Northeast Normal University Changchun, Jilin, 130024, P.R. China.
Dalton Trans. 2019 Oct 7;48(37):14115-14121. doi: 10.1039/c9dt02468a. Epub 2019 Sep 9.
CsPbBr is widely used in solar cells and LEDs for its excellent photoelectric properties that are also attractive for CO photoreduction, but it is less used in the photocatalytic reduction of CO mainly owing to its limited charge separation efficiency. To alleviate this issue, herein, all-inorganic orthorhombic CsPbBr was combined with graphitic carbon nitride (g-CN) and the resultant composite (CsPbBr@g-CN) showed enhanced activity in CO photoreduction. Under the irradiation of AM1.5 filter for 12 h, CO was converted into CH and CO with high selectivity to methane (91%) and the total amount of gaseous products up to ∼300 μmol g. This reactivity is 6-fold and 4-fold higher than that of pure g-CN and CsPbBr, respectively. CsPbBr@g-CN also shows excellent catalytic activity at low concentrations of CO. Studies of energy band level and steady-state and transient photoluminescence spectroscopy indicated that the incorporation of CsPbBr and g-CN increases charge separation, which may result in sharply enhanced catalytic efficiency. This study has provided opportunities for the combination of CsPbBr and other semiconductor catalysts for the photocatalytic reduction of CO.
CsPbBr 因其优异的光电性能而被广泛应用于太阳能电池和 LED 中，对于 CO 光还原也具有吸引力，但由于其电荷分离效率有限，因此在 CO 的光催化还原中较少使用。为了解决这个问题，本文将无机正交 CsPbBr 与石墨相氮化碳 (g-CN) 结合，所得复合材料 (CsPbBr@g-CN) 在 CO 光还原中表现出增强的活性。在 AM1.5 滤光片照射 12 小时后，CO 被转化为 CH 和 CO，甲烷的选择性高达 91%，总气态产物量高达约 300 μmol g。与纯 g-CN 和 CsPbBr 相比，这种反应性分别提高了 6 倍和 4 倍。CsPbBr@g-CN 在低浓度 CO 下也表现出优异的催化活性。能带水平和稳态和瞬态光致发光光谱研究表明，CsPbBr 和 g-CN 的掺入增加了电荷分离，这可能导致催化效率的大幅提高。本研究为 CsPbBr 和其他半导体催化剂在 CO 的光催化还原中的结合提供了机会。
