Improved water oxidation under visible light on oxyhalide Bi4MO8X (M = Nb, Ta; X = Cl, Br) photocatalysts prepared using excess halogen precursors,Sustainable Energy & Fuels

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Improved water oxidation under visible light on oxyhalide Bi4MO8X (M = Nb, Ta; X = Cl, Br) photocatalysts prepared using excess halogen precursors
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2018-03-30 , DOI: 10.1039/c8se00097b
Hironobu Kunioku _{1,

2,

3,

4,

5} , Akinobu Nakada _{1,

2,

3,

4,

5} , Masanobu Higashi _{1,

2,

3,

4,

5} , Osamu Tomita _{1,

2,

3,

4,

5} , Hiroshi Kageyama _{1,

2,

3,

4,

5} , Ryu Abe _{1,

2,

3,

4,

5}

Affiliation

We herein report the synthesis of a series of Bi-based oxyhalides, Bi₄MO₈X (M = Nb, Ta; X = Cl, Br), via solid-state reaction at different calcination temperatures and using various precursor ratios to improve their photocatalytic activity for water oxidation under visible light. The calcination temperature employed had an influence on the crystallite sizes, morphologies, specific surface areas, and surface compositions. Interestingly, when stoichiometric precursors were heated at higher temperatures, the crystallite sizes of Bi₄MO₈X decreased with cleavage occurring along the in-plane direction. Elemental analysis indicated that the unusual trend in Bi₄MO₈X can be explained by the volatile nature of halogen at higher temperatures. The volatilization of the halogen species was minimized when an excess of the halogen precursor BiOX was employed. The Bi₄MO₈X samples prepared with excess BiOX exhibited considerably higher photocatalytic activities for water oxidation under visible light, due to the suppressed halogen defects at which recombination of photogenerated carriers can occur. These findings offer a useful insight into the preparation of active oxyhalide photocatalysts.

中文翻译：

使用过量卤素前体制备的卤氧化物Bi ₄ MO ₈ X（M = Nb，Ta; X = Cl，Br）光催化剂在可见光下改善了水的氧化

我们在此报告了一系列基于Bi的卤氧化物Bi ₄ MO ₈ X（M = Nb，Ta; X = Cl，Br）的合成，这些反应是通过在不同煅烧温度下的固态反应并使用各种前体比率来改善的。在可见光下对水氧化的光催化活性。所用的煅烧温度对微晶尺寸，形态，比表面积和表面组成有影响。有趣的是，当化学计量的前体在更高的温度下加热时，Bi ₄ MO ₈ X的微晶尺寸随着沿面内方向的裂解而减小。元素分析表明Bi ₄ MO ₈的异常趋势X可以用卤素在较高温度下的挥发性来解释。当使用过量的卤素前体BiOX时，卤素种类的挥发被最小化。用过量的BiOX制备的Bi ₄ MO ₈ X样品在可见光下对水的氧化表现出相当高的光催化活性，这是由于受抑制的卤素缺陷会导致光生载流子发生重组。这些发现为活性卤氧化物光催化剂的制备提供了有用的见识。

更新日期：2018-06-27

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