DataSheet1_Epitaxial Growth of Flower-Like MoS2 on One-Dimensional Nickel Titanate Nanofibers: A “Sweet Spot” for Efficient Photoreduction of Carbon Dioxide.docx

Herein, a full spectrum-induced hybrid structure consisting of one-dimensional nickel titanate (NiTiO3) nanofibers (NFs) decorated by petal-like molybdenum disulfide (MoS2) particles was designed through a facile hydrothermal method. The key parameters for tailoring the morphology and chemical, surface, and interfacial properties of the heterostructure were identified for efficient and selective conversion of CO2 into valuable chemicals. Introducing MoS2 layers onto NiTiO3 NFs provided superior CO2 conversion with significantly higher yields. The optimized hybrid structure produced CO and CH4 yields of 130 and 55 μmol g−1 h−1, respectively, which are 3.8- and 3.6-times higher than those from pristine NiTiO3 nanofibers (34 and 15 μmol g−1 h−1, respectively) and 3.6- and 5.5-times higher than those from pristine MoS2 (37 and 10 μmol g−1 h−1, respectively). This improved performance was attributed to efficient absorption of a wider spectrum of light and efficient transfer of electrons across the heterojunction. Effective charge separation and reduced charge carrier recombination were confirmed by photoluminescence and impedance measurements. The performance may also be partly due to enhanced hydrophobicity of the hierarchical surfaces due to MoS2 growth. This strategy contributes to the rational design of perovskite-based photocatalysts for CO2 reduction.

本研究通过简便水热法，设计了一种全光谱响应型杂化结构：该结构以一维钛酸镍(NiTiO₃)纳米纤维(NFs)为基底，负载有花瓣状二硫化钼(MoS₂)颗粒。本研究明确了调控该异质结构的形貌、化学性质、表面特性与界面性质的关键参数，以实现高效且高选择性地将二氧化碳(CO₂)转化为高附加值化学品。在钛酸镍纳米纤维表面引入二硫化钼层后，可获得更优异的二氧化碳转化性能，产物收率显著提升。经优化的杂化结构所生成的一氧化碳(CO)与甲烷(CH₄)收率分别为130和55 μmol g⁻¹ h⁻¹，分别是纯相钛酸镍纳米纤维（收率分别为34和15 μmol g⁻¹ h⁻¹）的3.8倍与3.6倍，同时也是纯相二硫化钼（收率分别为37和10 μmol g⁻¹ h⁻¹）的3.6倍与5.5倍。该性能提升归因于两大核心机制：一是对更宽光谱范围的光能实现有效吸收，二是异质结界面处可发生高效的电子转移。通过光致发光与阻抗测试，证实该体系能够实现有效的电荷分离并降低载流子复合速率。此外，该性能提升还部分源于二硫化钼生长后分级表面疏水性的增强。本研究策略为面向二氧化碳还原的钙钛矿基光催化剂的合理设计提供了可行思路。