High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes,Environmental Science & Technology Letters

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High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2018-10-05 , DOI: 10.1021/acs.estlett.8b00397
Wenbo Shi _{1,

2} , Xuechen Zhou _{1,

3} , Jinyang Li ₄ , Eric R. Meshot ₅ , André D. Taylor _{1,

6} , Shu Hu _{1,

7} , Jae-Hong Kim _{1,

3} , Menachem Elimelech _{1,

3} , Desiree L. Plata _{1,

2}

Affiliation

Discovering electrode materials with exceptional capacitance, an indicator of the ability of a material to hold charge, is critical for developing capacitive deionization devices for water desalination. Maganese oxides (MnO_x) have shown promise as capacitive electrode materials, but they exhibit a trade-off in which a higher loading of the active MnO_x comes at the cost of lower conductivity. To address this challenge and achieve high salt adsorption, we fabricated electrodes comprising vertically aligned core–shell nanostructures using atomic layer deposition (ALD) to coat thin films of MnO_x onto vertically aligned carbon nanotubes (VACNTs). The inherently hierarchical, anisotropic, three-dimensional macroporous structure of VACNTs and the tunable coating, a hallmark of ALD, enabled co-optimization of the hybrid material’s specific capacitance with respect to mass and geometric area. The specific capacitance was optimized in this study to 215 ± 7 F/g and 1.1 ± 0.1 F/cm² in a 1 M NaCl electrolyte at a scan rate of 5 mV/s. This material exhibited a remarkable sodium ion adsorption capacity of 490 ± 30 μmol of Na/g of material (2-fold higher than that of pristine VACNTs) at a functioning voltage of 1.2 V, which may ultimately enable expanded desalination applications of capacitive deionization.

中文翻译：

通过氧化锰涂层，垂直排列的碳纳米管的高性能电容去离子

发现具有优异电容的电极材料（一种材料保持电荷的能力的指标）对于开发用于水脱盐的电容去离子设备至关重要。氧化锰（MnO _x）已显示出作为电容电极材料的前景，但它们之间存在一个折衷，即较高的活性MnO _x负载量以较低的电导率为代价。为了解决这一挑战并实现高盐吸附，我们使用原子层沉积（ALD）制备了包含垂直排列的核-壳纳米结构的电极，以涂覆MnO _x薄膜垂直排列的碳纳米管（VACNTs）上。VACNTs固有的分层，各向异性，三维大孔结构和可调谐涂层（ALD的标志）使混合材料相对于质量和几何面积的比电容得以共同优化。在本研究中，在1 M NaCl电解质中以5 mV / s的扫描速率将比电容优化为215±7 F / g和1.1±0.1 F / cm ²。这种材料在1.2 V的工作电压下表现出490±30μmolNa / g的钠离子吸附能力（比原始VACNTs高出2倍），具有显着的钠离子吸附能力，这最终可以扩大电容去离子的脱盐应用范围。

更新日期：2018-10-06

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