氧化亚铜/氧化镍复合阴极微生物光电化学池产氢性能研究
首发时间:2016-01-11
摘要:微生物光电化学池(Microbial Photoelectrochemical Cell,MPEC)通过微生物阳极氧化有机物与阴极光催化结合实现废物处理同步产能储氢。p型Cu2O半导体,作为高效光催化材料,存在稳定性不足的缺陷,限制着其应用发展。氧化镍(NiOx)作为一种有效的产氢催化剂可以有助于加速光生电子向电极溶液界面的迁移,进而降低光腐蚀。通过电沉积Cu2O与旋涂修饰NiOx制备复合光电阴极,考察NiOx涂层厚度(80-320nm)对Cu2O电极光电流的影响,发现在240 nm NiOx修饰的复合光阴极具有最佳的光催化与光稳定性。Cu2O/NiOx复合光阴极MPEC的电化学及产氢性能研究表明,在有无偏压条件下,阴极均有氢气产生;在0.2 V外加电压下,光催化产氢速率达到最高,达50.88 mL h-1 m-2。研究表明NiOx共催化剂以及施加外加电压的协同作用有效提高了Cu2O的光生电子产氢利用率,使MPEC产氢储能具有可行性。。
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Hydrogen evolution from a novel microbial photoelectrochemical cell with Cu2O/NiOx composite electrode
Abstract:Microbial photoelectrochemical cells (MPEC) is a clean solution for highly efficient energy recovery from wastewater, through introducing a synergistic effect of anodic microbial oxidation of organics and cathodic photocatalytic hydrogen evolution process. p-type semiconductor Cu2O has exhibited superior photocatalytic capability for hydrogen evolution, but the instability of Cu2O also hinders its further practical application. Here, we fabricated a Cu2O/NiOx composite photocathode by spin coating a thin film of NiOx on Cu2O film. Results showed that NiOx has a trade-off effect on the current and stability of Cu2O photocathode. The thicker of NiOx on Cu2O, the lower of the photocurrent but more stable of the Cu2O electrode. With an optimal 240 nm thickness of NiOx layer, the Cu2O/NiOx composite photocathode extracted excited electrons effectively, and a H2 production rate of 50.88 mL h-1 m-2 was obtained under 0.2 V external bias from MPEC.
Keywords: microbial photoelectrochemical cell, photocathode Cu2O, NiOx, H2 production
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No.4670555112223014****
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