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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Electrodeposited films to MOF-derived electrochemical energy storage electrodes: a concept of simplified additive-free electrode processing for self-standing, ready-to-use materials
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Electrodeposited films to MOF-derived electrochemical energy storage electrodes: a concept of simplified additive-free electrode processing for self-standing, ready-to-use materials

机译：电沉积的薄膜到MOF衍生的电化学能量存储电极：自站式即用的材料的简化无添加电极加工的概念

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摘要

The thermolysis of electrodeposited metal-organic framework (MOF) films represents a novel approach to build supercapacitor electrodes of already electrically contacted MOF-derived high-performance metal oxide/carbon materials which are also highly interesting for other applications. MOFs are widely utilised as precursors to synthesise functional materials by thermal decomposition (pyrolysis, carbonisation). Using electrochemically coated MOF precursor films instead of powder greatly simplifies the processing of such materials and potentially enhances the resulting active materials' performance. In the case of electrochemical energy storage electrodes, the coated substrate later functions as current collector which is well-attached to the active material without the need for any additives. This close connection decreases electron transfer resistances and saves multiple steps of powder formulation and coating. Films of a metal-organic framework based on 1,3,5-benzene-tricarboxylate (BTC) and cobalt(II) cations were electrochemically coated on cobalt foils which act as the Co2+ cation source. Manganese films were electrodeposited and subsequently partly redissolved in a linker-containing electrolyte to achieve Mn/Mn-BTC bilayered films on stainless steel. This procedure extends the method for any kind of current collector material. The films were thermolysed to gain nanostructured metal oxide spinel (Me3O4)/carbon hybrid electrodes. Investigations of the electrochemical properties in regard to supercapacitor applications show that Co3O4/C films exhibit pseudocapacitance and that Mn3O4/C films are suitable for redox electrodes with high-rate capability operating in a wide potential range in aqueous electrolytes. Co-BTC powder was also thermally treated yielding cobalt particles embedded in a graphitic carbon matrix. The pseudocapacitive properties of conventionally coated films of this powder material are limited.
机译：电沉积金属 - 有机框架（MOF）膜的热解代表了构建已经电接近的MOF衍生的高性能金属氧化物/碳材料的超级电容器电极的新方法，这对其他应用也非常有趣。 MOFS广泛用于通过热分解合成功能材料（热解，碳化）。使用电化学涂覆的MOF前体膜代替粉末极大地简化了这种材料的加工，并且可能提高了所得的活性材料的性能。在电化学能量存储电极的情况下，涂覆的基板以后用作集电器，其在不需要任何添加剂的情况下井连接到活性材料。这种紧密的连接降低了电子转移电阻并节省了多个粉末配方和涂层的步骤。基于1,3,5-苯 - 三羧酸酯（BTC）和钴（II）阳离子的金属有机骨架薄膜电化学涂覆在用作CO 2 +阳离子源的钴箔上。锰膜被电沉积，随后部分地重新溶解在含接头电解质中，以在不锈钢上实现Mn / Mn-BTC双层膜。该过程扩展了任何类型的集电器材料的方法。将薄膜热溶解，得到纳米结构金属氧化物尖晶石（ME3O4）/碳杂化电极。在超级电容器应用方面的电化学性质的研究表明，CO 3 O 4 / C膜表现出假偶联，MN3O4 / C膜适用于氧化还原电极，其高速率能力在宽势范围内在含水电解质中运行。还热处理CO-BTC粉末嵌入嵌入图形碳基质中的钴颗粒。该粉末材料的常规涂层膜的假壳特性受到限制。

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