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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：意外的可见光驱动光催化活性，没有助催化剂和来自（GaN）（1-x）（ZnO）（X）固溶的牺牲试剂在整个组成范围内以高压合成的固溶体

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摘要

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 degrees C, and at a pressure of 1 GPa. ZnGa2O4 was observed as a second phase, with the amount decreasing from 12.8 wt% at x = 0.07 to approximate 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 mol 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 mol h(-1), 0.55 mol h(-1) and 0.48 mol 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：光学和光催化性能用于在高压下在整个组成范围（X = 0.07〜0.9）中合成的固体溶液系列（GaN）的（1-X）（ZnO）的（x）的测定。我们报告用于从水中第一次光催化H-2进化活性（GaN）的（1-X）（ZnO）的（X）没有助催化剂，pH调节剂和牺牲试剂。合成通过以合适的量在温度范围1150年至1200年摄氏度反应的GaN和ZnO进行，并且在1 GPa的压力。 ZnGa2O4观察作为第二相，在x = 0.07从12.8％（重量）减少量近似于在x = 0.9 0.5％（重量）。在x = 0.51，观察到2.65电子伏特最小带隙和平均最大光催化H-2演化的2.31摩尔H（-1）速率。其中x = 0.07，0.24和0.76的样品具有2.89电子伏特的带隙，2.78 eV和2.83电子伏特，和1.8摩尔H平均氢气放出率（-1），0.55摩尔H（-1）和0.48摩尔H（-1 ）， 分别。其中x = 0.9的样品具有2.82电子伏特的带隙，但是没有释放出氢气。扩展光催化试验表明，经20小时显着降低的活性。

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