Carbon Anchored Epitaxially Grown Nickel Cobalt‐Based Carbonate Hydroxide for Urea Electrooxidation Reaction with a High Activity and Durability,ChemCatChem

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Carbon Anchored Epitaxially Grown Nickel Cobalt‐Based Carbonate Hydroxide for Urea Electrooxidation Reaction with a High Activity and Durability
ChemCatChem ( IF 3.8 ) Pub Date : 2020-03-13 , DOI: 10.1002/cctc.201902304
Diab Khalafallah _{1,

2} , Chong Ouyang ₁ , Mingjia Zhi ₁ , Zhanglian Hong ₁

Affiliation

Urea has shown a potential importance as a possible alternative hydrogen‐storage source for low‐temperature fuel cells. Besides, the electrooxidation of urea provides an efficient solution for the disposal of wastewater in the agricultural industry, but the state‐of‐the art urea electrocatalysis suffers from the associated sluggish kinetics. In this study, we fabricated unique vertically aligned nanorod arrays‐like carbon anchored nickel‐cobalt carbonate hydroxides (C−NiCo CHs) without agglomeration through a mass scale one‐step hydrothermal approach for electrocatalytic oxidation of urea in an alkaline environment. The composite affords a high specific surface area of 162.55 m² g⁻¹ with distinctive porous features, suggesting a large surface exposure and sufficient electrolyte accessibility during chemical reactions. The catalyst exhibits an outstanding electrocatalytic activity towards urea electrooxidation with a high current density and an outstanding durability benefiting from the tuned electric conductivity. Impressively, the hybrid shows a greatly improved catalytic performance at higher KOH moieties with a much‐enhanced peak current and a negatively shifted onset voltage, which can be interpreted by the intensive Ni activation processes caused by the densely formed OH⁻ ions. These findings signify that the well‐developed nanoarchitecture of C−NiCo CHs hybrid could pave the way to rationally fabricate highly active electrocatalysts for urea electrocatalysis.

中文翻译：

碳锚定外延生长的镍钴基碳酸盐氢氧化物，具有高活性和耐久性，可用于尿素电氧化反应

尿素作为低温燃料电池可能的替代储氢来源已显示出潜在的重要性。此外，尿素的电氧化为农业废水处理提供了一种有效的解决方案，但是最新的尿素电催化法却伴随着动力学迟缓的问题。在这项研究中，我们通过在碱性环境中对尿素进行电催化氧化的大规模规模一步水热方法，制备了独特的垂直排列的纳米棒阵列状碳锚定的镍钴碳酸氢盐氢氧化物（C-NiCo CHs）。该复合材料具有162.55 m ² g ^-1的高比表面积具有独特的多孔特征，表明在化学反应过程中有大量的表面暴露和足够的电解液可及性。该催化剂对尿素电氧化具有优异的电催化活性，具有高电流密度，并且得益于调节的电导率，具有优异的耐久性。令人印象深刻，混合显示在更高的KOH部分的大大提高催化性能具有更增强的峰值电流和一个起始电压，其可以通过由致密地形成OH密集镍活化过程被解释负移^-离子。这些发现表明，发达的C-NiCo CHs杂化纳米结构可为合理制造尿素电催化的高活性电催化剂铺平道路。

更新日期：2020-04-22

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