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Characterization of CuCo2O4 Prepared by Nitrate Route: Application to Ni2+ reduction under visible light
Journal of Photochemistry and Photobiology A: Chemistry ( IF 4.1 ) Pub Date : 2020-06-25 , DOI: 10.1016/j.jphotochem.2020.112728
R. Bagtache , S. Zahra , A. Abdi , M. Trari

Ni2+ was reduced by photo-catalysis on the hetero-system p-CuCo2O4 /n-TiO2 under visible light. The spinel CuCo2O4, elaborated by nitrate route, was characterized photo-electrochemically. A direct forbidden band of 1.44 eV was determined from the diffuse reflectance. It exhibits p-type behavior and a conduction band (- 1.11 VSCE) made up of Co3+: eg orbital, more cathodic than the Ni2+ level (-0.68 VSCE). The rate of Ni deposition increases with increasing the spinel dose and peaks for the optimal ratio CuCO2O4/TiO2 (50/50) with 60 % conversion (30 mg L−1) in less than 3 h. This occurred because TiO2 mediates the electron transfer to adsorbed Ni2+ ions. The decrease of the conversion rate on the system CuCo2O4/TiO2 over illumination time is due to the competitive water reduction onto deposited Ni clusters. The in situ photo-deposition of Ni-clusters forms hetero-system CuCo2O4/TiO2/Ni intimately contacted and the H2 formation is highly improved because of the low Ni over-potential. H2-evolution rate of 4.69 μmol min−1 g−1 and a quantum yield of 0.68 % were obtained under a light flux of 2.09 × 1019 photons s−1.



中文翻译:

硝酸盐法制备CuCo 2 O 4的表征:在可见光下还原Ni 2+的应用

通过在可见光下在异体系p -CuCo 2 O 4 / n -TiO 2上光催化还原Ni 2+。用硝酸盐法对尖晶石CuCo 2 O 4进行了光电化学表征。由漫反射确定1.44eV的直接禁带。它表现出p型行为和由Co 3+构成的导带(-1.11 V SCE):e g轨道,比Ni 2+能级(-0.68 V SCE)。Ni的沉积速率随尖晶石剂量的增加而增加,并且在不到3小时的时间内,具有60%转化率(30 mg L -1)的最佳比例CuCO 2 O 4 / TiO 2(50/50)达到峰值。这是因为TiO 2介导了电子转移到吸附的Ni 2+离子上。CuCo 2 O 4 / TiO 2体系上的转化率随光照时间的降低是由于竞争性减少了沉积在Ni团簇上的水。Ni团簇的原位光沉积形成紧密接触的异质体系CuCo 2 O 4 / TiO 2 / Ni和H由于低的Ni超电势,大大改善了2的形成。在2.09×10 19个光子s -1的光通量下,H 2的演化速率为4.69μmolmin -1 g -1,量子产率为0.68%。

更新日期:2020-06-25
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