Hydrogen plasma reduction induced oxygen vacancies in cubic In2O3 particles with enhanced photocatalytic performance
Hydrogen plasma reduction induced oxygen vacancies in cubic In2O3 particles with enhanced photocatalytic performance
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DOI：
10.1016/j.ceramint.2018.08.343
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发表时间：
2018-12
影响因子：
5.2
通讯作者：
Chenyang Shi;Jinhua Liu;Weidong Li;Xia Jiang;Huayuan Yang;Qi Liu
中科院分区：
文献类型：
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作者：
Chenyang Shi;Jinhua Liu;Weidong Li;Xia Jiang;Huayuan Yang;Qi Liu
氧空位对in2o3颗粒光催化性能的影响，前人从未研究过。本文采用水热法合成了立方形状的in2o3颗粒，通过控制氢等离子体还原过程中H2gas的流速，在in2o3颗粒中产生了不同浓度的氧空位。SEM图像证实氢等离子体还原没有改变颗粒的形态。用电子顺磁共振谱测定了氧空位的存在。最后，研究了不同氧空位浓度的in2o3颗粒在可见光下降解亚甲基蓝溶液的光催化性能。结果表明，当氢气流量为2 mL/min时，样品的光催化性能最高，再增加氢气流量，样品的光催化性能下降，这可能是由于In2O3的过度还原所致。
The impacts of oxygen vacancies on the photocatalytic performance of In2O3particles were never investigated previously. In this paper, cubic shape In2O3particles were synthesized by hydrothermal method, and different concentrations of oxygen vacancies were generated in In2O3particles by controlling the H2gas flow rate in hydrogen plasma reduction. The SEM images confirmed that the hydrogen plasma reduction did not change the particle morphology. The existence of oxygen vacancies was determined by electron paramagnetic resonance spectrum. Finally, the photocatalytic performance of In2O3particles with different concentration of oxygen vacancies was investigated by the degradation of Methylene Blue (MB) solution under visible light irradiation. It was observed that when the hydrogen flow rate is 2 mL/min, the sample showed the highest photocatalytic performance, a further increased flow rate resulted in a decreased photocatalytic performance, which could be attributed to the over reduction of In2O3.