In-situ growth of Zn–AgIn5S8 quantum dots on g-C3N4 towards 0D/2D heterostructured photocatalysts with enhanced hydrogen production
In-situ growth of Zn–AgIn5S8 quantum dots on g-C3N4 towards 0D/2D heterostructured photocatalysts with enhanced hydrogen production
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DOI：
10.1016/j.ijhydene.2019.01.102
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发表时间：
2019-06
影响因子：
7.2
通讯作者：
Yalin Yang;Baodong Mao;G. Gong;Di Li;Yanhong Liu;Weijing Cao;L. Xing;Jun Zeng;Weidong Shi-Weidong
中科院分区：
文献类型：
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作者：
Yalin Yang;Baodong Mao;G. Gong;Di Li;Yanhong Liu;Weijing Cao;L. Xing;Jun Zeng;Weidong Shi-Weidong
光催化水裂解制氢是太阳能收集和转化的理想途径，窄禁带多硫化物在其中起着重要作用。本文通过在g-C3N4纳米片上原位生长Zn-AgIn5S8量子点（QDs），制备了一系列Zn-AgIn5S8 /g-C3N4 0D/2D纳米复合材料，以改善电荷分离。令我们惊讶的是，g-C3N4纳米片不是光活性成分，而是作为电荷转移介质，其中只需要相对较低的比率。对制备的Zn-AgIn5S8 /g-C3N4纳米复合材料进行了系统的研究。当g-C3N4质量比为10%时，产氢率最高，是纯Zn-AgIn5S8QDs的1.39倍，是g-C3N4的138.6倍。Zn-AgIn5S8 /g-C3N4纳米复合材料的光催化活性增强是由于其紧密的界面接触，通过PL寿命、瞬态光电流和电化学阻抗谱测量证明了这种接触可以有效地分离和转移光生载流子。Zn-AgIn5S8 /g-C3N4纳米复合材料也表现出良好的循环稳定性。提出了0D/2D Zn-AgIn5S8 /g-C3N4复合光催化剂的合理机理。这项工作为构建高质量的量子点/纳米片的0D/2D异质结构提供了一种相对简单的方法，并为提高窄带隙硫化物光催化剂的效率提供了新的见解。
Photocatalytic water splitting for hydrogen production represents an ideal pathway for solar energy harvesting and conversion, for which narrow bandgap multinary sulfides play an important role. Here, series of Zn–AgIn5S8/g-C3N4 0D/2D nanocomposites were prepared by in-situ growth of the Zn–AgIn5S8quantum dots (QDs) on g-C3N4 nanosheets for improved charge separation. To our surprise, rather than a photoactive component, here g-C3N4 nanosheets act as a charge transfer mediator, where only a relatively low ratio is required. The as-fabricated Zn–AgIn5S8/g-C3N4 nanocomposites were systematically studied. When the mass ratio of g-C3N4 was 10%, the hydrogen production rate was maximized, which was 1.39 times higher than pure Zn–AgIn5S8QDs and 138.6 times higher than g-C3N4. The enhanced photocatalytic activity of the Zn–AgIn5S8/g-C3N4 nanocomposites is attributed to the intimate interface contact, which results in the effective separation and transfer of the photogenerated charge carriers as proved by the PL lifetime, transient photocurrent and electrochemical impedance spectra measurements. The Zn–AgIn5S8/g-C3N4 nanocomposites also exhibit excellent cycle stability. A plausible mechanism was proposed for the 0D/2D Zn–AgIn5S8/g-C3N4 composite photocatalysts. This work provides a relatively simple method for constructing high-quality 0D/2D heterostructure of QDs/nanosheets, as well as new insight for the efficiency improvement of narrow-bandgap sulfide photocatalysts.