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Mesoporous tungsten oxide modified by nanolayered manganese-calcium oxide as robust photoanode for solar water splitting
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2018-01-16 , DOI: 10.1016/j.jcis.2018.01.053
Kezhen Li , Chao Zhang , Aijuan Liu , Dongmei Chu , Chunyong Zhang , Ping Yang , Yukou Du , Jie Huang

Described herein is the synthesis, characterization and photoelectrochemical behavior of a novel composite consisting of nanolayered manganese-calcium oxide (MCO) and mesoporous tungsten trioxide (WO3). The samples were characterized by transmission electron microscopy (TEM), and X-ray diffraction (XRD). The results demonstrated that superior interfacial contacts had been formed between WO3 and MCO. UV–vis diffuse reflectance spectroscopy (DRS), photoelectrochemical characterization, and incident photon-to-current efficiency (IPCE) revealed an enhanced light harvesting and effective electron-hole separation. A photoelectrochemical (PEC) cell composed of the n-type MCO/WO3 as a photoanode and platinum sheet as a counter electrode was assembled to estimate the feasibility for overall water splitting under a solar simulator illumination. The photocatalytic hydrogen and oxygen production from the photochemical cell with optimized photocatalyst (MCO/WO3-9) under 2 h simulated solar light irradiation was 1.9 μmol and 0.7 μmol, respectively, at low extra bias (0.90 V vs. RHE). Our investigation suggests that coupling MCO with n-type semiconductor WO3 as photoanode is a promising method to improve the activity of overall water splitting to generate oxygen and hydrogen.



中文翻译:

纳米层锰钙氧化物改性的介孔氧化钨作为用于太阳能水分解的强健光阳极

本文描述了由纳米层锰钙氧化物(MCO)和中孔三氧化钨(WO 3)组成的新型复合材料的合成,表征和光电化学行为。样品通过透射电子显微镜(TEM)和X射线衍射(XRD)进行表征。结果表明,WO 3和MCO之间已经形成了良好的界面接触。紫外可见漫反射光谱(DRS),光电化学特性和入射光子电流效率(IPCE)显示出增强的光收集和有效的电子-空穴分离。由n型MCO / WO 3组成的光电化学(PEC)电池组装了作为阳极的铂和作为反电极的铂片,以评估在太阳模拟器照明下进行总水分解的可行性。在2 h模拟太阳光照射下,采用优化的光催化剂(MCO / WO 3 -9)的光化学电池产生的光催化氢和氧的产生分别为1.9μmol和0.7μmol,且具有较低的额外偏压(相对于RHE为0.90 V)。我们的研究表明,将MCO与n型半导体WO 3作为光阳极耦合是一种有前途的方法,可以提高总水分解产生氧气和氢气的活性。

更新日期:2018-01-16
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