Citation: Zhou XU, Yu-Xuan LIU, Cheng-Feng XU, Zi-Han HUYAN, Sha LUO, Wei LI, Shou-Xin LIU. B-Doped Hierarchical Porous Carbon Spheres Prepared by Xylose-Soft Template Hydrothermal Strategy for Enhancing Electrochemical Property[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(10): 2006-2018. doi: 10.11862/CJIC.2022.192 shu

B-Doped Hierarchical Porous Carbon Spheres Prepared by Xylose-Soft Template Hydrothermal Strategy for Enhancing Electrochemical Property

Key Laboratory of Bio-based Material Science & Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China

Corresponding author: Shou-Xin LIU, liushouxin@126.com
Received Date: 25 March 2022
Revised Date: 13 July 2022

Figures(9)

B-doped hierarchical porous carbon spheres (BPC_S) were prepared by hydrothermal and carbonization method using D-xylose as a carbon source, sodium laurate as a soft template, and boric acid as a dopant. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), N₂ adsorption-desorption test, X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), Fourier infrared spectroscopy (FT - IR), Raman spectroscopy, X-ray powder diffraction (XRD), and thermogravimetric (TG) analysis indicated that the hierachical porous structure with narrow size (2-5 μm) were compounded by spontaneous self-assembly from hydrogen-bond interaction between the carbon source and the soft template. Moreover, sodium laurate was also used as a pore - forming agent (mesopore). Boric acid was doped on the carbon spheres in the form of BC₃, BCO₂, and BC₂O and improved the surface wettability. After CO₂ activation, decomposition of sodium laurate and the accumulation of colloidal carbon spheres, micropore (0.5 - 1.2 nm), mesopore (3.14 - 35.00 nm), and macropore (60 - 146 nm) were produced respectively. Electrochemical test results showed that the porous carbon spheres (BPC_S - 1) treated with 0.927 5 g boric acid had the optimal supercapacitor performance. In a three-electrode system, BPC_S-1 showed a high specific capacitance of 287.12 F·g^-1 at a current density of 0.5 A·g^-1. In a two-electrode system, BPC_S-1 showed an excellent energy density (5.3 Wh·kg^-1) and a superior specific capacitance of 151.34 F·g^-1 at a current density of 0.5 A·g^-1, and outstanding cycling stability of 96.43% capacitance retention after 1 000 cycles at a current density of 5 A·g^-1.
- xylose,
- hydrothermal,
- soft template,
- boron doping,
- hierarchical structure,
- porous carbon spheres
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