Samal Alaka, Das Dipti P, Madras Giridhar
Academy of Scientific and Innovative Research, CSIR- Institute of Minerals and Materials Technology, Bhubaneswar, 751013, Odisha, India.
Colloids and Material Chemistry, CSIR- Institute of Minerals and Materials Technology, Bhubaneswar, 751013, Odisha, India.
Sci Rep. 2018 Feb 13;8(1):2881. doi: 10.1038/s41598-018-21239-7.
The same copper phosphate catalysts were synthesized by obtaining the methods involving solid state as well as liquid state reactions in this work. And then the optimised p-n hybrid junction photocatalysts have been synthesized following the same solid/liquid reaction pathways. The synthesized copper phosphate photocatalyst has unique rod, flower, caramel-treat-like morphology. The Mott-Schottky behavior is in accordance with the expected behavior of n-type semiconductor and the carrier concentration was calculated using the M-S analysis for the photocatalyst. And for the p-n hybrid junction of 8RGO-Cu(PO)-PA (PA abbreviated for photoassisted synthesis method), 8RGO-Cu(PO)-EG(EG abbreviated for Ethylene Glycol based synthesis method), 8RGO-Cu(PO)-PEG (PEG abbreviated for Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol based synthesis method)the amount of H synthesized was 7500, 6500 and 4500 µmol/h/g, respectively. The excited electrons resulting after the irradiation of visible light on the CB of p-type reduced graphene oxide (RGO) migrate easily to n-type Cu(PO) via. the p-n junction interfaces and hence great charge carrier separation was achieved.
在本工作中，通过固态和液态反应方法合成了相同的磷酸铜催化剂。然后，按照相同的固/液反应路径合成了优化的p-n杂化结光催化剂。合成的磷酸铜光催化剂具有独特的棒状、花状、焦糖状形态。莫特-肖特基行为符合n型半导体的预期行为，并使用M-S分析计算了光催化剂的载流子浓度。对于8RGO-Cu(PO)-PA（PA为光辅助合成方法的缩写）、8RGO-Cu(PO)-EG（EG为基于乙二醇的合成方法的缩写）、8RGO-Cu(PO)-PEG（PEG为聚（乙二醇）-嵌段-聚（丙二醇）-嵌段-聚（乙二醇）基合成方法的缩写）的p-n杂化结，合成氢气的量分别为7500、6500和4500 µmol/h/g。p型还原氧化石墨烯（RGO）的导带在可见光照射后产生的激发电子通过p-n结界面容易迁移到n型Cu(PO)，从而实现了良好的电荷载流子分离。
