The design of nitrogen-doped core–shell-structured mesopore-dominant hierarchical porous carbon nanospheres for high-performance capacitive deionization,Environmental Science: Nano

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The design of nitrogen-doped core–shell-structured mesopore-dominant hierarchical porous carbon nanospheres for high-performance capacitive deionization
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-09-27 , DOI: 10.1039/d0en00854k
Yubo Zhao _{1,

2,

3,

4,

5} , Xiujuan Li _{1,

2,

3,

4,

5} , Xiaoping Mo _{1,

2,

3,

4,

5} , Kexun Li _{1,

2,

3,

4,

5}

Affiliation

Capacitive deionization has been extensively regarded as a promising technology for the desalination of brackish water. So far, the main bottleneck hindering CDI from large-scale applications is the low desalination capacity, which is closely associated with the unprogressive electrode material. Exploring advanced electrode materials is, therefore, the top priority of research efforts. In this work, through structural optimization and a polarization enhancement strategy, we have designed nitrogen-doped, core–shell-structured, mesopore-dominant hierarchical porous carbon nanospheres (N-CS-MD-HPCS) that deliver a superior electrosorption capacity of 28.10 mg g⁻¹ in 1000 mg L⁻¹ NaCl solution with a voltage of 1.2 V and is repeatable in desalination testing. The considerable significance of nitrogen-doping is revealed via multiple material measurements, which contribute to the improvement of physicochemical properties such as conductivity and wettability, the amelioration of pore structure and the morphological transformation from the yolk–shell to the core–shell structure. The boost in the capacitance behavior is partly attributed to the increment of the electrical-double-layer capacitance and partly associated with the generation of pseudopotential capacitance by introducing nitrogen according to the electrochemical measurements. Consequently, all results demonstrate that the acquired N-CS-MD-HPCS would be a remarkable material for realizing high desalination performance in CDI systems.

中文翻译：

用于高性能电容去离子的氮掺杂核壳结构中孔为主的分层多孔碳纳米球的设计

电容去离子已被广泛认为是一种用于微咸水脱盐的有前途的技术。到目前为止，阻碍大规模应用CDI的主要瓶颈是淡化能力低，这与渐进式电极材料密切相关。因此，探索先进的电极材料是研究工作的重中之重。在这项工作中，通过结构优化和极化增强策略，我们设计了氮掺杂，核-壳结构，以中孔为主的分级多孔碳纳米球（N-CS-MD-HPCS），可提供28.10的出色电吸附能力毫克g ^-1（1000毫克L ^-1）电压为1.2 V的NaCl溶液，可在脱盐测试中重复使用。氮掺杂的重要意义通过多种材料的测量，有助于改善物理化学性质，例如电导率和润湿性，改善孔结构以及从卵黄-壳向核-壳结构的形态转变。电容性能的提高部分归因于双电层电容的增加，部分归因于通过根据电化学测量引入氮而产生的假电位电容。因此，所有结果表明，获得的N-CS-MD-HPCS将是在CDI系统中实现高脱盐性能的出色材料。

更新日期：2020-11-03

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