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Alkali Metal Cations Incorporation in Conductive TiO2 Nanoflakes with Improved Photoelectrochemical H2 Generation
ChemElectroChem ( IF 4 ) Pub Date : 2020-03-13 , DOI: 10.1002/celc.202000238
Elham Khorashadizade 1, 2 , Shiva Mohajernia 2 , Seyedsina Hejazi 2 , Hamid Mehdipour 1 , Naimeh Naseri 1 , Omran Moradlou 3 , Ning Liu 2 , Alireza Z. Moshfegh 1, 4 , Patrik Schmuki 2, 5
Affiliation  

In this research, the effect of alkali metal cations including Li, Na and Cs in hydrothermal solution is investigated on the morphology, stability, and photoactivity of nanostructured TiO 2 nanoflakes as a photoanode. The TiO 2 nanoflakes are formed through hydrothermal treatment of Ti foil in 1.0 M LiOH, NaOH or CsOH at 100 °C for 3h. By subsequent thermal reduction of the structure in an optimized Ar/H 2 environment, conductive TiO 2 nanoflakes were formed. The reduction treatment remarkably improves the photocurrent density of the TiO 2 nanoflakes and has the highest impact on the sample treated in the NaOH alkali solution. For the nanoflakes produced in NaOH alkali solution, the bandgap is shifted to a lower value and the structure shows the most stable morphology after thermal treatment compared to nanoflakes formed in other alkali solutions. Such reduced hydrothermally treated nanoflakes formed in NaOH can generate a photocurrent density of ~ 1mA/cm ‐2 vs. Ag/AgCl in 1.0M KOH solution which is six times higher than for pristine TiO 2 .

中文翻译:

将碱金属阳离子掺入导电性TiO2纳米薄片中,改善了光电化学氢气的产生

在这项研究中,研究了碱金属阳离子(包括Li,Na和Cs)在水热溶液中对纳米结构TiO 2纳米薄片作为光阳极的形态,稳定性和光活性的影响。TiO 2纳米薄片是通过在1.0 M LiOH,NaOH或CsOH中于100°C对Ti箔进行水热处理3h形成的。通过随后在优化的Ar / H 2环境中对结构进行热还原,可以形成导电TiO 2纳米薄片。还原处理显着提高了TiO 2纳米薄片的光电流密度,并且对在NaOH碱溶液中处理的样品具有最大的影响。对于在NaOH碱溶液中产生的纳米薄片,与在其他碱溶液中形成的纳米薄片相比,能带隙移动到较低的值,并且结构在热处理后显示出最稳定的形态。
更新日期:2020-03-16
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