A Reactive Template Synthesis of Hierarchical Porous Carbon and Its Application to Supercapacitor Electrodes,Macromolecular Materials and Engineering

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A Reactive Template Synthesis of Hierarchical Porous Carbon and Its Application to Supercapacitor Electrodes
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-09-13 , DOI: 10.1002/mame.202000168
Xiang‐Hui Yan _{1,

2,

3} , Hao Xu _{1,

3} , Guoli Fang _{1,

3} , Tong Xue _{1,

3} , Ziwei Meng _{1,

3} , Jong‐Min Lee ₂

Affiliation

Hierarchical porous carbons (HPCs) are highly in demand as electrode materials for efficient supercapacitors. Herein, a modified template carbonization approach in conjunction with chemical activation is described for synthesis of HPCs by direct one‐pot pyrolysis of a mixture of glucose (G), reactive template precursor (Zn₂(OH)₂CO₃)(BZC), and K₂CO₃ (PC) in which in situ ZnO produced from decomposition of Zn₂(OH)₂CO₃ acts as template and K₂CO₃ as activator, followed by simple acid‐leaching. The resultant undoped carbon [HPC(G‐BZC‐PC)] is endowed with coral reef‐like morphology, 3D porous networks, numerous micro/mesopores, ultrahigh surface area, and goodelectrical conductivity. The specific capacitance delivered by a two‐electrode symmetric supercapacitor with the HPC(G‐BZC‐PC) achieves 241.2 F g⁻¹ at 1 A g⁻¹, which is superior to that of the two control samples prepared without addition of BZC and PC, respectively. Furthermore, the rate capability reaches as high as to 90.5% and 74.6% with current density from 1 to 10 A g⁻¹ and 50 A g⁻¹, respectively, and an excellent cycling stability is observed with more than 98% of retention after 10 000 cycles at 5 A g⁻¹ in 6 m KOH. It is concluded that a cooperative effect deriving from the above‐mentioned unique features contributes to the enhanced supercapacitor performance.

中文翻译：

分层多孔碳的反应模板合成及其在超级电容器电极中的应用

对于高效超级电容器的电极材料，分层多孔碳（HPC）的需求量很大。本文介绍了一种结合化学活化的修饰模板碳化方法，该方法通过直接一锅热解葡萄糖（G），反应性模板前体（Zn ₂（OH）₂ CO ₃）（BZC）的混合物进行HPC合成，和K ₂ CO ₃（PC），其中由Zn ₂（OH）₂ CO ₃分解产生的原位ZnO充当模板，K ₂ CO ₃作为活化剂，然后进行简单的酸浸。产生的未掺杂碳[HPC（G-BZC-PC）]具有珊瑚礁样的形态，3D多孔网络，大量的微孔/中孔，超高表面积和良好的导电性。通过与HPC的两电极对称超级电容器提供的比电容（G-BZC-PC）实现241.2 F G ^-1 1个A G ^-1，这是优于在两个对照样品的不添加BZC和制备PC，分别。此外，在电流密度为1到10 A g ^-1和50 A g ^-1时，倍率能力分别高达90.5％和74.6％，观察到优异的循环稳定性，并保持了98％以上的保持率。 5 A g下10000次循环^-1在6 m KOH中。结论是，源自上述独特功能的协同效应有助于增强超级电容器的性能。

更新日期：2020-11-16

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