Nanoporous Sr-rich strontium titanate: a stable and superior photocatalyst for H2 evolution

Feng, Liangliang; Zou, Xiaoxin; Zhao, Jun; Zhou, Liping; Wang, Dejun; Zhang, Xiao; Li, Guodong

doi:10.1039/c3cc45795h

Cited by 33 publications

(23 citation statements)

References 25 publications

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“…Among perovskite oxides, the alkaline earth metal titanate, SrTiO 3 has been extensively explored experimentally and theoretically for vacancy engineering by different methods. [ 97 ] In addition, SrTiO 3 ‐based materials have also been reported for benchmark water splitting performance. [ 98 ] Feng et al.…”

Section: Vacancy Engineered Materials For Photocatalytic H2 Evolution and N2 Fixationmentioning

confidence: 99%

Vacancy Engineering in Semiconductor Photocatalysts: Implications in Hydrogen Evolution and Nitrogen Fixation Applications

Kumar

Krishnan

2021

Adv Funct Materials

237

143

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It is a well‐known fact that the pronounced photogenerated charge recombination and poor light absorption are the main bottlenecks of photocatalysis applications. The conventional approaches to address these problems involve bandgap engineering and suppression of charge recombination after light irradiation, which results in an enhancement in the photocatalytic performance of the materials. However, the most essential aspect of surface modification to engineer active sites on the catalyst surface is generally not given much importance. Contrary to this, defect engineering is another approach by which the optical, charge separation, and surface properties of the photocatalytic materials can be tuned. In this review article, the effect of the introduction of vacancies on the photocatalytic properties of selected semiconductor materials, viz., metal oxides, perovskite oxides, metal sulfides, oxyhalides, and nitrides is comprehensively summarized. The engineering of vacancies in these materials not only improves their optical and charge transfer properties but also affects the surface properties, which are helpful in the adsorption of the reactants on catalyst surface. Herein, photocatalytic hydrogen evolution and nitrogen fixation applications of vacancy engineered materials are discussed in detail along with the current trends, scalability requirements, and rigorous experimental protocols.

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Section: Vacancy Engineered Materials For Photocatalytic H2 Evolution and N2 Fixationmentioning

confidence: 99%

Vacancy Engineering in Semiconductor Photocatalysts: Implications in Hydrogen Evolution and Nitrogen Fixation Applications

Kumar

Krishnan

2021

Adv Funct Materials

237

143

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“…SrTiO 3 is well known as a photocatalyst with a potential for overall water splitting . The methods to improve its photocatalytic activity have been intensively studied so far in various aspects . Doping is one of the most important techniques to improve their activity, and the photocatalytic activity of SrTiO 3 is vastly changed by introducing impurities .…”

Section: Introductionmentioning

confidence: 99%

Effect of Na‐Doping on Electron Decay Kinetics in SrTiO₃ Photocatalyst

et al. 2019

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Photocatalytic water splitting by solar light is an environmentfriendly means for generating hydrogen as energy resources. For practical use, photocatalysts with higher activity are desired.Recently it was found that the photocatalytic activity of SrTiO 3 is remarkably improved by Na-doping. However, why Nadoping enhances the activity has not been well understood. In this work, we found that Na-doping in SrTiO 3 introduces new mid-gap states. Transient absorption measurements revealed that photoexcited electrons were trapped into these states within~20 ps after excitation. These trapped electrons have longer lifetime than those in undoped SrTiO 3 , and number of surviving electrons in microseconds increased~15 times. These electrons are trapped at the mid-gap states, but still keep reactivity with reactant molecules. Furthermore, they were effectively captured by H 2 -evolution cocatalyst, indicating that they can participate in steady-state reactions. This work emphasizes the important role of electron-trapping states introduced by doping on photocatalytic activity.[a] Dr.

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“…Since stability is critical for any catalyst, the time courses of photocatalytic hydrogen evolution over CuNPs from photoreduction were recorded under irradiation intermittently for 60 h, with evacuation every 12 h. Significantly, evolution rate of hydrogen shows a linear increase with the increasing of illumination time for the entire measurement, and no noticeable degradation in photocatalytic activity was observed after five sequential 12 h runs, suggesting that the catalyst is stable for at least 60 h. The total evolution of H 2 after 60 h was 0.27 mmol, far exceeding the amount of Cu precursor added (0.002 mmol). The CuNPs generated in this system showed high performance, stability, and recyclability for HER when using lactic acid as a sacrificial electron donor in the absence of air.…”

mentioning

confidence: 99%

CuNPs for Efficient Photocatalytic Hydrogen Evolution

Liu

Wang

Zeng

2015

Part & Part Syst Charact

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Nanoporous Sr-rich strontium titanate: a stable and superior photocatalyst for H2 evolution

Abstract: A synthetic route to prepare nanoporous Sr-rich strontium titanate (Sr : Ti ≈ 1.03) with a high surface area is reported. The as-obtained porous nanomaterial serves as a stable and superior photocatalyst for H2 evolution.

Cited by 33 publications

References 25 publications

Vacancy Engineering in Semiconductor Photocatalysts: Implications in Hydrogen Evolution and Nitrogen Fixation Applications

Vacancy Engineering in Semiconductor Photocatalysts: Implications in Hydrogen Evolution and Nitrogen Fixation Applications

Effect of Na‐Doping on Electron Decay Kinetics in SrTiO₃ Photocatalyst

CuNPs for Efficient Photocatalytic Hydrogen Evolution

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Nanoporous Sr-rich strontium titanate: a stable and superior photocatalyst for H2 evolution

Abstract: A synthetic route to prepare nanoporous Sr-rich strontium titanate (Sr : Ti ≈ 1.03) with a high surface area is reported. The as-obtained porous nanomaterial serves as a stable and superior photocatalyst for H2 evolution.

Cited by 33 publications

References 25 publications

Vacancy Engineering in Semiconductor Photocatalysts: Implications in Hydrogen Evolution and Nitrogen Fixation Applications

Vacancy Engineering in Semiconductor Photocatalysts: Implications in Hydrogen Evolution and Nitrogen Fixation Applications

Effect of Na‐Doping on Electron Decay Kinetics in SrTiO3 Photocatalyst

CuNPs for Efficient Photocatalytic Hydrogen Evolution

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Effect of Na‐Doping on Electron Decay Kinetics in SrTiO₃ Photocatalyst