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Electrosynthesis of urea from nitrite and CO2 over oxygen vacancy-rich ZnO porous nanosheets
Cell Reports Physical Science ( IF 7.9 ) Pub Date : 2021-03-17 , DOI: 10.1016/j.xcrp.2021.100378
Nannan Meng , Yanmei Huang , Yang Liu , Yifu Yu , Bin Zhang

Urea electrosynthesis under mild conditions shows great potential to conquer the conventional manufacturing industry with huge energy consumption. Here, self-supported oxygen vacancy-rich ZnO (ZnO-V) porous nanosheets are prepared using the electroreduction method and adopted as an efficient catalyst for aqueous urea electrosynthesis by using CO2 and nitrite contaminants as feedstocks. The urea Faradaic efficiency of ZnO-V achieves 23.26% at −0.79 V versus the reversible hydrogen electrode (RHE), which is almost 3 times as high as that of ZnO (8.10%). Liquid chromatography is developed for quantitative analysis of urea. The combined results of online differential electrochemical mass spectrometry (DEMS) and in situ diffuse reflectance infrared Fourier transform spectroscopy unveil a possible coupling pathway of NH2∗ and COOH∗ intermediates for urea formation. Our work opens an avenue for rational construction of efficient electrocatalysts for urea electrosynthesis and broadens the scope of products available from nitrite and CO2 reduction.



中文翻译:

富氧空缺的ZnO多孔纳米片由亚硝酸盐和CO 2电合成尿素

在温和条件下进行尿素电合成显示出巨大的潜力,以巨大的能耗来征服常规制造业。在此,使用电还原方法制备自支撑的富氧空位的ZnO(ZnO-V)多孔纳米片,并通过使用CO 2和亚硝酸盐污染物作为原料,将其用作尿素电合成的有效催化剂。与可逆氢电极(RHE)相比,ZnO-V的尿素法拉第效率在-0.79 V时达到23.26%,几乎是ZnO(8.10%)的三倍。开发了液相色谱法用于尿素的定量分析。在线差分电化学质谱(DEMS)和原位分析的综合结果漫反射红外傅里叶变换光谱揭示了NH 2*和COOH *中间体形成尿素的可能耦合途径。我们的工作为合理构建尿素电合成的高效电催化剂开辟了道路,并拓宽了亚硝酸盐和CO 2还原产品的适用范围。

更新日期:2021-03-24
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