N-doped Ti3+rich SrTiO3 for efficient photoelectrochemical water splitting

被引:0
|
作者
Madan, Krateeka [1 ,2 ]
Rao, H. Seshagiri [1 ,2 ]
Harikrishna, R. B. [1 ,2 ]
Rao, G. Ranga [1 ,2 ]
机构
[1] Indian Inst Technol Madras, Dept Chem, Chennai 600036, India
[2] Indian Inst Technol Madras, DST Solar Energy Harnessing Ctr, Chennai 600036, India
关键词
Strontium Titanate; Photoelectrochemical water splitting; Hydrothermal; PHOTOCATALYTIC ACTIVITY; TIO2; NANOPARTICLES; NITROGEN; PHOTOLUMINESCENCE; INSIGHT; FILMS;
D O I
10.1016/j.cattod.2024.115055
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
In this work, hydrothermally synthesized SrTiO3 (STO) is subjected to ammonia reduction for 15 h and 45 h at 1000 degree celsius under controlled conditions. The ammonia treatment reduced the band gap of SrTiO3 from 3.2 eV to 2.8 eV in ammonia-treated SrTiO3 samples (STON). XRD and Raman analysis confirm the presence of cubic phase in the STO and ammonia-treated STON-15 and STON-45 samples. Additionally, the presence of N due to ammonia reduction in STON-15 and STON-45 samples is verified by XPS analysis. In addition, XPS data shows an increase in the Ti3+ concentration in the STON-15 sample relative to the STON-45 sample when N is incorporated. STON-15 showed higher photocurrent density throughout the potential range of water splitting. An increase from 98 mu A/cm2 to 250 mu A/cm2 in the cathodic photocurrent density at 0 VRHE is obtained for STON-15 sample compared to STO sample. In contrast to STO, which only displayed a photocurrent density of 4.97 mu A/ cm2, STON-15 showed an anodic photocurrent density of 140 mu A/cm2 at 1.23 VRHE. All the photoelectrochemical studies were carried out without using co-catalysts and sacrificial agents.
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页数:11
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