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首页> 外文期刊>ACS applied materials & interfaces >Visible-Light-Responsive Photocatalysts toward Water Oxidation Based on NiTi-Layered Double Hydroxide/Reduced Graphene Oxide Composite Materials
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Visible-Light-Responsive Photocatalysts toward Water Oxidation Based on NiTi-Layered Double Hydroxide/Reduced Graphene Oxide Composite Materials

机译：NiTi层状双氢氧化物/还原氧化石墨烯复合材料对水氧化的可见光响应光催化剂

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摘要

A visible-light responsive photocatalyst was fabricated by anchoring NiTi-layered double hydroxide (NiTi-LDH) nanosheets to the surface of reduced graphene oxide sheets (RGO) via an in situ growth method; the resulting NiTi-LDH/RGO composite displays excellent photo-catalytic activity toward water splitting into oxygen with a rate of 1.968 mmol g~(-1) h~(-1) and a quantum efficiency as high as 61.2% at 500 nm, which is among the most effective visible-light photocatalysts, XRD patterns and SEM images indicate that the NiTi-LDH nanosheets (diameter: 100-200 nm) are highly dispersed on the surface of RGO. UV—vis absorption spectroscopy exhibits that the introduction of RGO enhances the visible-light absorption range of photocatalysts, which is further verified by the largely decreased band gap (～1.78 eV) studied by cyclic voltammetry measurements. Moreover, photoluminescence (PL) measurements indicate a more efficient separation of electron—hole pairs; electron spin resonance (ESR) and Raman scattering spectroscopy confirm the electrons transfer from NiTi-LDH nanosheets to RGO, accounting for the largely enhanced carrier mobility and the resulting photocatalytic activity in comparison with pristine NiTi-LDH material. Therefore, this work demonstrates a facile approach for the fabrication of visible-light responsive NiTi-LDH/RGO composite photocatalysts, which can be used as a promising candidate in solar energy conversion and environmental science.
机译：通过原位生长方法，将NiTi层状双氢氧化物（NiTi-LDH）纳米片锚定在还原氧化石墨烯片（RGO）的表面上，制成可见光响应型光催化剂。所得的NiTi-LDH / RGO复合材料对水分解成氧气具有优异的光催化活性，其速率为1.968 mmol g〜（-1）h〜（-1），在500 nm处的量子效率高达61.2％，作为最有效的可见光催化剂之一，XRD图谱和SEM图像表明NiTi-LDH纳米片（直径：100-200 nm）高度分散在RGO的表面上。紫外可见吸收光谱法表明，引入RGO可以增加光催化剂的可见光吸收范围，这通过循环伏安法研究的带隙大大减小（〜1.78 eV）得到了进一步证明。此外，光致发光（PL）测量表明电子-空穴对的分离更加有效;电子自旋共振（ESR）和拉曼散射光谱证实了电子从NiTi-LDH纳米片转移到RGO，与原始NiTi-LDH材料相比，可大大提高载流子迁移率并产生光催化活性。因此，这项工作展示了一种制备可见光响应型NiTi-LDH / RGO复合光催化剂的简便方法，该方法可用作太阳能转化和环境科学的有希望的候选者。

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