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首页> 外文期刊>RSC Advances >Homojunction and defect synergy-mediated electron–hole separation for solar-driven mesoporous rutile/anatase TiO2 microsphere photocatalysts
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Homojunction and defect synergy-mediated electron–hole separation for solar-driven mesoporous rutile/anatase TiO2 microsphere photocatalysts

机译：太阳能驱动的中孔金红石/锐钛矿TiO2微球光催化剂的同质结和缺陷协同介导电子孔分离

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The photocatalytic hydrogen evolution of TiO _(2) is deemed to be one of the most promising ways of converting solar energy to chemical energy; however, it is a challenge to improve the photo-generated charge separation efficiency and enhance solar utilization. Herein, black mesoporous rutile/anatase TiO _(2) microspheres with a homojunction and surface defects have been successfully synthesized by an evaporation-induced self-assembly, solvothermal and high-temperature surface hydrogenation method. The H500-BMR/ATM (H X -BMR/ATM, where X means the different hydrogen calcination temperatures) materials not only possess a mesoporous structure and relatively high specific surface area of 39.2 m ~(2) g ~(?1) , but also have a narrow bandgap (～2.87 eV), which could extend the photoresponse to the visible light region. They exhibit high photocatalytic hydrogen production (6.4 mmol h ~(?1) g ~(?1) ), which is much higher (approximately 1.8 times) than that of pristine mesoporous rutile/anatase TiO _(2) microspheres (3.58 mmol h ~(?1) g ~(?1) ). This enhanced photocatalytic hydrogen production property is attributed to the synergistic effect of the homojunction and surface defects in improving efficient electron–hole separation and high utilization of solar light. This work proposes a new approach to improve the performance of photocatalytic hydrogen production and probably offers a new insight into fabricating other high-performance photocatalysts.
机译：TiO _（2）的光催化氢进化被认为是将太阳能转化为化学能的最有希望的方式之一;然而，提高照片产生的电荷分离效率并增强太阳能利用是一项挑战。这里，通过蒸发诱导的自组装，溶剂热和高温表面氢化方法成功地合成了具有同质结和表面缺陷的黑介孔金红石/锐钛矿TiO _（2）微球。 H500-BMR / ATM（HX -BMR / ATM，其中X表示不同的氢煅烧温度）材料不仅具有介孔结构和相对高的比表面积为39.2m〜（2）g〜（？1），但还具有窄的带隙（〜2.87eV），可以将光响应延伸到可见光区域。它们表现出高光催化氢气生产（6.4mmol H〜（α1）g〜（α1）），其高于原始介孔金红石/锐钛矿TiO _（2）微球（3.58mmol H）（约1.8倍） 〜（？1）g〜（？1））。这种增强的光催化氢气生产特性归因于同源结和表面缺陷在提高有效的电子空穴分离和高利用太阳光下的协同效应。这项工作提出了一种提高光催化氢气生产性能的新方法，并提供了对制造其他高性能光催化剂的新洞察力。

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