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Solar Photoelectroreduction of Nitrate Ions on PbI2/CuI Nanocomposite Electrodes
Solar RRL ( IF 6.0 ) Pub Date : 2020-09-09 , DOI: 10.1002/solr.202000418
Egon Kecsenovity 1 , Saji Thomas Kochuveedu 1 , Jyh-Pin Chou 2 , Diána Lukács 3 , Ádám Gali 2 , Csaba Janáky 1
Affiliation  

Solar light–driven photoelectrochemical conversion of nitrate ions to nitrite is achieved on copper‐lead iodide nanocomposite electrodes. By optimizing the composition, 1.2 ± 0.05 mA cm−2 photocurrent density is obtained under concentrated solar irradiation. The reduction products are NO2 and N2, at 0.61 V reversible hydrogen electrode (RHE), which is at least 600 mV higher than the redox potential of these processes. The faradaic efficiency of NO2 ion formation is up to 52% while no hydrogen evolution occurs. Optical studies show the possibility of exciting electrons from the valence band of CuI to the conduction band of PbI2 upon illumination, extending the visible light absorption of the nanocomposite photoelectrode. Experimental and theoretical optoelectronic studies indicate that CuI and PbI2 are held together by weak attractive forces (also excluding the formation of a new compound), which opens a new strategy to design metal halide nanocomposite photoelectrodes with tailored properties.

中文翻译:

PbI2 / CuI纳米复合电极上硝酸根离子的太阳光电还原

在碘化铜-碘化铅纳米复合电极上实现了太阳光驱动下的硝酸根离子向亚硝酸根的光电化学转化。通过优化组成,在集中的太阳辐射下获得1.2±0.05mA cm -2的光电流密度。该还原产物是NO 2 -和N 2,在0.61 V可逆氢电极(RHE),其为至少600毫伏高于这些过程的氧化还原电位。的NO的法拉第效率2 -离子的形成达到了52%,而没有氢气放出发生。光学研究表明,可能会激发从CuI价带到PbI 2导带的电子在照射时,扩展了纳米复合光电极的可见光吸收。实验和理论光电研究表明,CuI和PbI 2通过弱的吸引力保持在一起(也排除了新化合物的形成),这为设计具有定制性能的金属卤化物纳米复合光电极开辟了新的策略。
更新日期:2020-09-09
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