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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Plate-like Sm2Ti2S2O5 Particles Prepared by a Flux-Assisted One-Step Synthesis for the Evolution of O-2 from Aqueous Solutions by Both Photocatalytic and Photoelectrochemical Reactions
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Plate-like Sm2Ti2S2O5 Particles Prepared by a Flux-Assisted One-Step Synthesis for the Evolution of O-2 from Aqueous Solutions by Both Photocatalytic and Photoelectrochemical Reactions

机译：通过光催化和光电化学反应，通过通量辅助一步合成通过助焊剂辅助一步合成制备的板状SM2TI2S2O5颗粒。通过光催化和光电化学反应从水溶液中的换气

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Sm2Ti2S2O5 (STSO) is a visible-light-responsive oxysulfide semiconductor photocatalyst with applications to water splitting. In this work, plate-like STSO particles were synthesized through a flux-assisted one-step method at various temperatures. The activities of these materials during photocatalytic and photoelectrochemical O-2 evolution from aqueous solutions were investigated. Single-phase STSO with a single crystal habit was produced at 923 K, which is approximately 200 K lower than the temperatures required for previously reported methods, such as solid-state reactions and thermal sulfurization under a H2S flow. The STSO sample synthesized at the optimal temperature exhibited an AQE of 1.3 +/- 0.2% at 420 nm during photocatalytic sacrificial O-2 evolution. This efficiency is twice the values reported for specimens prepared using conventional methods. An STSO/Ti/Sn electrode fabricated by the particle transfer method generated a photoanodic current and evolved O-2 by water oxidation with a Faradaic efficiency of approximately 70 +/- 7%. The synthesis temperature yielding the highest activity was lower for photocatalytic O-2 evolution than photoelectrochemical O-2 evolution. This work demonstrates the applicability for of the flux method to the synthesis of well-crystallized oxysulfides having various particle sizes and intended for different uses.
机译：SM2TI2S2O5（STSO）是一种可见光响应氧硫化物半导体光催化剂，其应用于水分裂。在这项工作中，通过在各种温度下通过助焊剂辅助的一步法合成板状STSO颗粒。研究了这些材料在光催化和光电化学O-2从水溶液中的进化过程中的活性。具有单晶含养的单相STO在923 k下产生，大约200 k比先前所报道的方法所需的温度，例如固态反应和H 2 S流动的热硫化。在最佳温度下合成的STSO样品在光催化牺牲O-2进化期间在420nm下显示出1.3 +/- 0.2％的AQE。这种效率是使用常规方法制备的标本报告的值的两倍。由颗粒转移方法制造的STSO / Ti / Sn电极产生光阳极电流并通过水氧化而进化的O-2，具有约70 +/- 7％的游泳效率。对于光催化O-2演化，产生最高活性的合成温度比光电化学O-2进化更低。该工作证明了助焊剂方法的适用性与具有各种颗粒尺寸的良好结晶的氧硫化物合成并用于不同用途的合成。

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