Multidisciplinary methods (co-precipitation, ultrasonic, microwave, reflux and hydrothermal) for synthesis and characterization of CaMn3O6 nanostructures and its photocatalytic water splitting performance
Multidisciplinary methods (co-precipitation, ultrasonic, microwave, reflux and hydrothermal) for synthesis and characterization of CaMn3O6 nanostructures and its photocatalytic water splitting performance
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DOI：
10.1016/j.ijhydene.2019.08.141
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发表时间：
2019-10
影响因子：
7.2
通讯作者：
S. Gholamrezaei;Maryam Ghiyasiyan-Arani;M. Salavati‐Niasari;H. Moayedi
中科院分区：
文献类型：
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作者：
S. Gholamrezaei;Maryam Ghiyasiyan-Arani;M. Salavati‐Niasari;H. Moayedi
可见光下水裂解制氢和制氧是一种简单的太阳能制氢方法，是一种很有希望的清洁可再生制氢方法。然而，仍然缺乏在可见光下具有显著活性的潜在材料。过渡金属氧化物半导体由于其安全、化学惰性、价格低廉、稳定性好等特点，在光催化制氢方面得到了广泛的应用。尽管如此，半导体光催化剂的广泛应用受到其不能利用可见光区域的太阳能的限制。本文采用共沉淀法、超声波法、微波法、回流法和水热法等湿化学方法合成了纳米复合金属氧化物（MMO）Ca3MnO6。纳米Ca3MnO6的初步选择基于形貌和各自的颗粒直径。所选样品显示出明确的单晶，不含任何杂质，完整的结构形成，以及约5.3 eV的带隙能量（Eg）。超声波法合成的产物具有最好的形貌、纯度和最高的分解水为氢和氧的效率。无论制备方法和形态，所有样品都将水分解为氢气和氧气，这从它们各自的光催化分析中得到了证实。当所选样品与（NH4）2Ce（NO3）6结合时，单晶Ca3MnO6纳米粒子在可见光下更有效地将水分解为氢和氧。我们的研究结果表明，纳米结构的Ca3MnO6单晶光催化剂在太阳能水分解的重要性。
Production of hydrogen and oxygen from water splitting reaction under visible light is a simple method for conversion of solar-to-hydrogen energy and it is a hopeful clean and renewable method for H2fuel generation. However, there is still a lack of potential materials with significant activity under visible light. Because of safety, chemical inertness, low cost, stability and other characteristics, transition metal oxide semiconductors have been widely applied as photocatalysts for hydrogen generation. Albeit, wide usage of semiconductor photocatalysts were prevented by its inability to exploit solar energy of visible region. Here we show synthesis of a nano-sized mixed metal oxide (MMO) Ca3MnO6through wet-chemistry methods such as co-precipitation, ultrasonic, microwave, reflux, and hydrothermal methods. The nano-sized Ca3MnO6has initially selected based on morphology and respective particle diameters. The selected sample shows a well-defined single crystal, free from any impurities, complete structural formation, and a band gap energy (Eg) of around 5.3 eV. The best product synthesized in ultrasonic method which shows the best morphology, purity and the highest efficiency for splitting of water to hydrogen and oxygen. Irrespective of preparation methods and morphologies, all samples split water into hydrogen and oxygen, as confirmed from their respective photocatalytic analysis. When the selected sample combined with (NH4)2Ce(NO3)6, the single-crystal Ca3MnO6nanoparticles split water into hydrogen and oxygen more efficiently under visible light. Our findings demonstrate the importance of nanostructured Ca3MnO6single-crystal photocatalysts in solar water splitting.