Enhanced photoelectrochemical water splitting of CrTiO2 nanotube photoanodes by the decoration of their surface via the photodeposition of Ag and Au†,Dalton Transactions

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Enhanced photoelectrochemical water splitting of CrTiO2 nanotube photoanodes by the decoration of their surface via the photodeposition of Ag and Au†
Dalton Transactions ( IF 3.5 ) Pub Date : 2018-08-03 00:00:00 , DOI: 10.1039/c8dt02383b
Tayebeh Sharifi _{1,

2,

3,

4} , Yousef Ghayeb _{1,

2,

3,

4} , Tecush Mohammadi _{1,

2,

3,

4} , Mohamad Mohsen Momeni _{1,

2,

3,

4}

Affiliation

It is of great significance to develop green fuels in order to prevent the accumulation of carbon dioxide generated by the combustion of conventional fossil fuels. A potential, clean, renewable alternative fuel, which may be produced from solar energy, stored and safely transported, is hydrogen. In this work, bare CrTiO₂ NTs were fabricated using an in situ anodizing process. CrTiO₂ NTs were then modified with the photodeposition of noble metals (Ag and Au) at different light irradiation times (10–120 min). The new photocatalysts have been characterized using SEM, EDX, XRD, Raman and UV-vis spectra. The impact of noble metals on the photo-electrochemical activities of the photocatalysts has been evaluated. In addition, electrochemical impedance spectroscopy was conducted for the semiconductor/electrolyte interface. Most of the current density is related to Ag4/CrTiO₂ NTs and Au4/CrTiO₂ NTs, and is nearly 2 and 3 times as that of the bare CrTiO₂ NTs, respectively. All of the samples have adequate stability during continuous illumination for 1200 s. Finally, water splitting was performed under light irradiation at 0.6 V vs. Ag/AgCl for 60 min. Ag4/CrTiO₂ NTs and Au4/CrTiO₂ NTs have the highest H₂ evolution among their families, corresponding to 0.52 and 0.80 ml cm⁻² h⁻¹, respectively.

中文翻译：

通过Ag和Au †的光沉积修饰其表面，从而增强了CrTiO ₂纳米管光阳极的光电化学水分解能力

开发绿色燃料以防止常规化石燃料燃烧所产生的二氧化碳蓄积具有重要意义。潜在的，清洁的，可再生的替代燃料是氢气，它可以由太阳能产生，储存和安全运输。在这项工作中，使用原位阳极氧化工艺制备了裸露的CrTiO ₂ NTs 。CrTiO ₂然后在不同的光照射时间（10-120分钟）下用贵金属（Ag和Au）进行光沉积来修饰NTs。使用SEM，EDX，XRD，拉曼光谱和UV-vis光谱对新型光催化剂进行了表征。已经评估了贵金属对光催化剂的光电化学活性的影响。另外，对半导体/电解质界面进行了电化学阻抗谱。大部分电流密度的有关AG4 / CrTiO _2周的NT和AU4 / CrTiO _2周的NT，并且几乎是2和3倍，裸CrTiO的₂的NT，分别。在连续照明1200 s期间，所有样品均具有足够的稳定性。最后，在0.6V vs.5V的光照射下进行水分解。Ag / AgCl 60分钟。Ag4 / CrTiO ₂ NTs和Au4 / CrTiO ₂ NTs在它们的族中具有最高的H ₂析出，分别对应于0.52和0.80 ml cm ^-2 h ^-1。

更新日期：2018-08-03

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