Preparation and properties of carbon-based electrocatalysts from gasification fine slag for oxygen reduction

被引：0

作者：

Wang S.-M. ^{[1
]}

Gong Y. ^{[1
]}

Li H. ^{[1
]}

Zhao L.-L. ^{[1
]}

Guo Q.-H. ^{[1
]}

Yu G.-S. ^{[1
,2
]}

机构：

[1] Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai

[2] State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, Ningxia University, Yinchuan

来源：

Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2022年 / 50卷 / 06期

关键词：

gasification fine slag; N-doped; oxygen reduction reaction; porous carbon;

D O I：

10.19906/j.cnki.JFCT.2022006

中图分类号：

学科分类号：

摘要：

Gasification fine slag is a kind of solid waste with high carbon content produced in coal gasification process. The residual carbon obtained by carbon ash separation is a potential carbon source for preparing high quality carbon materials. In this study, the carbon residue after flotation of fine gasification slag was used as the precursor to prepare N-doped carbon-based electrocatalysts through high temperature activation. Combined with the characterization of Raman spectroscopy, XPS and SEM, the influence of activator ratio and nitrogen source on the physical and chemical structure of the catalyst was explored. The intrinsic relationship between activation formula and oxygen reduction performance of catalyst was revealed. The feasibility of preparing carbon-based electrocatalysts with gasification fine slag as raw material was verified. The results demonstrate that the oxygen reduction catalytic performance of carbon materials increases first and then decreases with the increase of the proportion of KOH. The optimal catalytic performance was achieved when the mass ratio of carbon residue to KOH was 1:4. In addition, melamine has stronger nitrogen doping effect as a nitrogen source than NH4Cl, making the initial potential of CKN6-143 up to 0.87 V (vs. RHE), the limiting current density is 4.95 mA/cm2, and the average electron transfer number is 3.82, indicating that CKN6-143 has good electrocatalytic performance. The results provide a possibility for preparing oxygen reduction catalyst with gasification fine slag. © 2022 Science Press. All rights reserved.

引用

页码：714 / 723

页数：9

共 26 条

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