Efficient Photocatalytic H2O2 Production and Cr(VI) Reduction over a Hierarchical Ti3C2/In4SnS8 Schottky Junction

文献类型： 外文期刊

第一作者： Zhou, Tong

作者： Zhou, Tong;Zhao, Liang;Qiao, Mingtao;Lei, Wanying;Liu, Xue

作者机构：

关键词： Ti 3 C 2; In 4 SnS 8; Photocatalysis; H 2 O 2 production; Cr(VI) reduction

期刊名称：ACTA PHYSICO-CHIMICA SINICA （ 影响因子：10.9； 五年影响因子：4.9 ）

ISSN： 1000-6818

年卷期： 2024 年 40 卷 10 期

页码：

收录情况： SCI

摘要： Artificial photosynthesis is an appealing approach for generating hydrogen peroxide (H 2 O 2 ) from H 2 O and O 2 with solar energy as the sole energy input. However, the current catalyst systems commonly face challenges such as the limited optical absorption, poor electron -hole pair separation efficiency, and restricted surface reactivity, which hinders the overall photoactivity. Here, we immobilize cubicphase ultrathin In 4 SnS 8 nanosheets ( E g = 2.16 eV) with thickness of 5-10 nm on the surface of few -layer Ti 3 C 2 to develop a sandwich -like hierarchical structure of Ti 3 C 2 /In 4 SnS 8 nanohybrid via in situ hydrothermal strategy. The enlarged interfacial area and close contact between Ti 3 C 2 and In 4 SnS 8 benefit for carrier transportation among nanohybrids. Characterization through X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) corroborates the successful construction of Ti 3 C 2 /In 4 SnS 8 nanostructures. Band structures investigation including valence band maximum and Mott -Schottky plots reveals the formation of Schottky junction in this 2D/2D heterostructure, that favors for ultrafast charge carrier separation and transportation from In 4 SnS 8 to Ti 3 C 2 and preventing the electrons backflow from Ti 3 C 2 to In 4 SnS 8 . Photoluminescene analysis and photo/electrochemical measurements prove that the combination of Ti 3 C 2 and In 4 SnS 8 accelerates the transportation of photoexcited electronhole pairs and efficiently suppresses charge carrier recombination. Unsurprisingly, 7 wt% Ti 3 C 2 /In 4 SnS 8 catalysts exhibit the highest visible -light -driven photoreactivity with H 2 O 2 production rates of 1.998 mu mol center dot L -1 center dot min -1 that is 2.2 times larger than that of single In 4 SnS 8 . Additionally, Ti 3 C 2 /In 4 SnS 8 demonstrates a multifunctional capability in Cr(VI) reduction with the greatest reaction rates of 19.8 x 10 -3 min -1 that is almost 4 -fold larger than that of individual semiconductor. Moreover, the nanohybrids exhibit excellent photostability after 5 cycles testing in both reaction systems. The morphology, crystal structure and composition for Ti 3 C 2 /In 4 SnS 8 remain unaltered after photoreaction. A comprehensive analysis including trapping agents and atmosphere experiments as well as electron paramagnetic resonance demonstrates that the H 2 O 2 evolution pathway consists of two channels: a two-step successive 1e - oxygen reduction reaction and a one-step 2e - water oxidation reaction. This work may provide a viable protocol for designing efficient and multifunctional photocatalytic systems for solar -to -chemical energy conversion.

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