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Chitosan coated copper-oxide nano particles: a novel electro-catalyst for CO2 reduction

机译：壳聚糖涂覆的氧化铜纳米粒子：新型的二氧化碳还原电催化剂

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摘要

We report here a simple one-pot method for the synthesis of copper-oxide based novel film forming electro catalysts for CO2 reduction. Water dispersible chitosan (CS)-CuO/Cu2O (CuxO) nano composites of diameter 10-20 nm were obtained by hydrothermal reactions of CS, CuSO4 center dot 5H(2)O and tartaric acid (TA). Here, TA acts as a multifunctional reagent as de-polymerizer of CS, ionic cross linker of depolymerised CS and complex forming ligand with Cu2+ ions. These CS coated CuxO nanoparticles were characterized by HRTEM, UV-VIS, AFM, FTIR and XPS. An ultra thin film of composite catalyst was deposited onto a Pt electrode by drop cast techniques and applied to study CO2 reduction by cyclic voltammetric techniques. The voltammogram shows a reduction peak at -0.665 V vs. RHE at pH 5.3 with a short hydrogen evolution tail indicating its better performance in terms of retarding the H-2 evolution reaction. This has been explained proposing a model of protonated CS on the electrode surface that repels incoming H+ ions at the electrode-electrolyte interface. This is the first time a film forming copper-oxide based nano composite material for efficient electro-catalytic reduction of CO2 in aqueous solution has been reported.
机译：我们在这里报告了一种简单的一锅法，用于合成基于氧化铜的新型成膜电催化剂以减少CO2。通过CS，CuSO4中心点5H（2）O和酒石酸（TA）的水热反应获得了直径为10-20 nm的水分散性壳聚糖（CS）-CuO / Cu2O（CuxO）纳米复合材料。在此，TA用作CS的解聚剂，解聚的CS的离子交联剂以及与Cu2 +离子形成络合物的配体的多功能试剂。这些CS包覆的CuxO纳米颗粒通过HRTEM，UV-VIS，AFM，FTIR和XPS进行了表征。通过滴铸技术将复合催化剂的超薄膜沉积到Pt电极上，并用于研究通过循环伏安技术进行的CO2还原。伏安图显示在-0.665 V相对于pH 5.3的RHE有一个还原峰，并带有短的析氢尾巴，表明它在阻止H-2析出反应方面具有更好的性能。对此进行了解释，提出了在电极表面上形成质子化CS的模型，该模型可以排斥在电极-电解质界面处进入的H +离子。这是首次报道用于有效电催化还原水溶液中CO2的成膜氧化铜基纳米复合材料。

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