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首页> 外文期刊>RSC Advances >Unexpected visible light driven photocatalytic activity without cocatalysts and sacrificial reagents from a (GaN)1–x(ZnO)x solid solution synthesized at high pressure over the entire composition range
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Unexpected visible light driven photocatalytic activity without cocatalysts and sacrificial reagents from a (GaN)1–x(ZnO)x solid solution synthesized at high pressure over the entire composition range

机译：在整个组成范围内，在高压下合成的（GaN）1-x（ZnO）x固溶体中没有助催化剂和牺牲试剂的情况下，意外的可见光驱动的光催化活性

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Optical and photocatalytic properties were determined for the solid solution series (GaN) _(1– x ) (ZnO) _( x ) synthesized at high pressure over the entire compositional range ( x = 0.07 to 0.9). We report for the first time photocatalytic H _(2) evolution activity from water for (GaN) _(1– x ) (ZnO) _( x ) without cocatalysts, pH modifiers and sacrificial reagents. Syntheses were carried out by reacting GaN and ZnO in appropriate amounts at temperatures ranging from 1150 to 1200 °C, and at a pressure of 1 GPa. ZnGa _(2) O _(4) was observed as a second phase, with the amount decreasing from 12.8 wt% at x = 0.07 to ～0.5 wt% at x = 0.9. The smallest band gap of 2.65 eV and the largest average photocatalytic H _(2) evolution rate of 2.31 μmol h ~(?1) were observed at x = 0.51. Samples with x = 0.07, 0.24 and 0.76 have band gaps of 2.89 eV, 2.78 eV and 2.83 eV, and average hydrogen evolution rates of 1.8 μmol h ~(?1) , 0.55 μmol h ~(?1) and 0.48 μmol h ~(?1) , respectively. The sample with x = 0.9 has a band gap of 2.82 eV, but did not evolve hydrogen. An extended photocatalytic test showed considerable reduction of activity over 20 hours.
机译：确定了在整个组成范围内（x = 0.07至0.9）在高压下合成的固溶体系列（GaN）_（1-x）（ZnO）_（x）的光学和光催化性能。我们首次报道了在没有助催化剂，pH调节剂和牺牲剂的情况下，水对（GaN）_（1-x）（ZnO）_（x）的光催化H _（2）析出活性。通过使适当量的GaN和ZnO在1150至1200°C的温度和1 GPa的压力下进行合成。观察到ZnGa _（2）O _（4）为第二相，其含量从x = 0.07时的12.8 wt％降至x = 0.9时的〜0.5 wt％。在x = 0.51处观察到最小的带隙为2.65 eV，最大的平均光催化H _（2）演化速率为2.31μmolh〜（？1）。 x = 0.07、0.24和0.76的样品的带隙为2.89 eV，2.78 eV和2.83 eV，平均析氢速率为1.8μmolh〜（？1），0.55μmolh〜（？1）和0.48μmolh〜 （？1）。 x = 0.9的样品的带隙为2.82 eV，但没有放出氢。延长的光催化测试表明，在20个小时内活性大大降低。

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