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首页> 外文期刊>Catalysis science & technology >Vacancy induced photocatalytic activity of La doped In(OH)(3) for CO2 reduction with water vapor
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Vacancy induced photocatalytic activity of La doped In(OH)(3) for CO2 reduction with water vapor

机译：空位诱导光催化的活性掺杂在(OH)(3)减少二氧化碳与水蒸汽

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In this work, La doped plate-like In(OH)(3) was synthesized by a simple one-step solvothermal method and used for photoreduction of CO2 with water as a reductant. A series of characterization techniques including SEM, TEM/HRTEM, XRD, Raman, XPS, PL, UV-vis DRS, TPD, and in situ FTIR were performed to determine the crystal structure, morphology, and optical and electronic properties, respectively. The results showed that the incorporation of doped La into the lattice of In(OH)(3) resulted in the formation of more indium defects due to the lattice distortion, which narrowed the band gap and improved the visible light absorption capability. Meanwhile, the strength and amount of adsorbed CO2 species on the catalysts were greatly enhanced due to promoted surface basicity and increased defect sites originating from La doping. As a result, the La doped In(OH)(3) samples show much higher photocatalytic activity for CO2 reduction compared to the undoped one. 1.5%La-In(OH)(3) shows the highest photocatalytic activity among all the samples, with H-2, CO, and CH4 formation rates of 54.33, 34.71, and 56.56 mu mol g(cat)(-1) h(-1), respectively, which are about 3.6, 3.4, and 2.0 times higher than those on undoped In(OH)(3), respectively. Comparatively, excessive La doping caused the formation of La(OH)(3) while a limited amount of La enters the In(OH)(3) lattice, which leads to decreased defect concentration and reduced photocatalytic activity. This work opens up a new perspective to efficiently regulate the vacancies of In(OH)(3) with a facile approach and systematic investigation.
机译：在这工作,La掺杂状(OH) (3)合成了一个简单的一步solvothermal方法和用于二氧化碳的光致还原作用水作为还原剂。包括扫描电镜表征技术,TEM - HRTEM XRD,拉曼、XPS PL, TPD UV-vis DRS和原位红外光谱进行了测定晶体结构、形貌、光学和电子性质,分别。表明,掺杂拉进的公司的晶格(OH)(3)导致的形成更多的缺陷由于铟晶格畸变,缩小了带隙并提高了可见光的吸收能力。催化剂上吸附二氧化碳的物种极大地增强了由于提升表面碱度和增加缺陷来自洛杉矶的网站兴奋剂。样品表现出更高的催化活性减少二氧化碳比纯的。1.5%洛杉矶(哦)(3)显示了最高的光催化活动在所有的样品中,与h2、CO和CH4形成率为54.33,34.71和56.56亩摩尔g h (cat)(1)(1),分别是3.6、3.4和2.0倍在无掺杂(OH)(3),分别。相比之下,过多的掺杂引起的形成拉(OH)(3)而有限的La进入(OH)(3)晶格,从而导致减少缺陷浓度和降低光催化活性。的角度有效地调节空缺(OH)的简单方法,(3)系统的调查。

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