2,5-furandicarboxylic acid (FDCA), one of the key building block for replacing petroleum-derived tereph-thalic acid, is utilized as the source of bioplastics, pharmaceuticals. Herein, free-standing Cu(OH)2 and CuO nanowires as electrode were examined to disclose the effects of crystal structure and chemical formation based on copper oxide in electrocatalytic 5-Hydroxymethylfurfural (HMF) oxidation to FDCA in 0.1 M KOH solution. We introduced on three-dimensional copper foam (CuF) with high porosity as copper source and substrate with high conductivity free-standing Cu(OH)2 and CuO nanowires (NWs) on the substrate by inorganic polymerization and calcination for electrochemical HMF oxidation. This was enabled by square-planar coordination (σx2-y2) of Cu2+ ions in (001) crystal faces of Cu(OH)2 crystal. As a result of stacking with hydrogen bonds, free-standing Cu(OH)2 NWs on the substrate was formed. There was no change in the morphology of the nanowire arrays, but the active sites from a plane area per surface-exposed Cu atoms by transformation of Cu(OH)2 to CuO NWs increased.

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哪种电极更适合生物质增值：Cu(OH)2 或 CuO 纳米线？

2,5-呋喃二甲酸 (FDCA) 是替代石油衍生的对苯二甲酸的关键组成部分之一，被用作生物塑料和药物的来源。在此，研究了独立式 Cu(OH)2 和 CuO 纳米线作为电极，以揭示基于氧化铜的晶体结构和化学形成在 0.1 M KOH 溶液中电催化 5-羟甲基糠醛 (HMF) 氧化为 FDCA 中的影响。我们引入了具有高孔隙率的三维泡沫铜（CuF）作为铜源，并通过无机聚合和煅烧在基底上引入了具有高导电性的独立式 Cu(OH)2 和 CuO 纳米线（NWs），用于电化学 HMF 氧化。这是通过 Cu(OH)2 晶体的 (001) 晶面中 Cu2+ 离子的方形平面配位 (σx2-y2) 实现的。由于与氢键叠加，在衬底上形成独立的 Cu(OH)2 NW。纳米线阵列的形态没有变化，但通过将 Cu(OH)2 转化为 CuO NW，每个表面暴露的 Cu 原子的平面面积中的活性位点增加。