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

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2024-09-26 DOI:10.1016/j.cattod.2024.115055

Krateeka Madan, H. Seshagiri Rao, R.B. Harikrishna, G. Ranga Rao

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Abstract

In this work, hydrothermally synthesized SrTiO₃ (STO) is subjected to ammonia reduction for 15 h and 45 h at 1000 ℃ 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 μA/cm² to 250 μA/cm² in the cathodic photocurrent density at 0 V_RHE is obtained for STON-15 sample compared to STO sample. In contrast to STO, which only displayed a photocurrent density of 4.97 μA/cm², STON-15 showed an anodic photocurrent density of 140 μA/cm² at 1.23 V_RHE. All the photoelectrochemical studies were carried out without using co-catalysts and sacrificial agents.

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用于高效光电化学水分离的富含 N 掺杂 Ti3+ 的 SrTiO3

在这项研究中，水热合成的氧化钛酸锶（STO）在受控条件下分别在 1000 ℃ 下进行了 15 小时和 45 小时的氨还原处理。在氨处理的 SrTiO3 样品（STON）中，氨处理将 SrTiO3 的带隙从 3.2 eV 降至 2.8 eV。XRD 和拉曼分析证实了 STO 以及氨处理过的 STON-15 和 STON-45 样品中存在立方相。此外，XPS 分析还验证了 STON-15 和 STON-45 样品中因氨还原而存在 N。此外，XPS 数据显示，当加入 N 时，STON-15 样品中的 Ti3+ 浓度相对于 STON-45 样品有所增加。在整个水分裂电位范围内，STON-15 显示出更高的光电流密度。与 STO 样品相比，STON-15 样品在 0 VRHE 时的阴极光电流密度从 98 μA/cm2 增加到 250 μA/cm2。STO 的光电流密度仅为 4.97 μA/cm2，而 STON-15 在 1.23 VRHE 时的阳极光电流密度为 140 μA/cm2。所有光电化学研究都是在不使用助催化剂和牺牲剂的情况下进行的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.