Correlations between electrochemical resistances and surface properties of acid-treated fuel in coal fuel cells

被引：10
作者：
Eom, Seongyong [1 ]
Ahn, Seongyool [2 ]
Kang, Kijoong [1 ]
Choi, Gyungmin [1 ]
机构：
[1] Pusan Natl Univ, Sch Mech Engn, Busan 609735, South Korea
[2] Kyushu Univ, Dept Mech Engn, Fukuoka 8190395, Japan
来源：
ENERGY | 2017年 / 140卷
基金：
新加坡国家研究基金会;
关键词：
Surface functional groups; Coal ash; Acid treatment; Charge transfer resistance; Electrolyte resistance; POLYMER ELECTROLYTE MEMBRANE; DIRECT CARBON; THERMAL-DECOMPOSITION; ACTIVATED CARBON; GASIFICATION; PERFORMANCE; ANODE; SYSTEM; CHEMISTRY; CHAR;
D O I：
10.1016/j.energy.2017.09.034
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Herein, we investigate the relationship between fuel surface properties and inner resistances of direct carbon fuel cells (DCFCs) by subjecting raw coal to a liquid-phase chemical treatment and correlating its surface property changes (e.g., degree of oxidation, surface area, and ash composition) with those of electrochemical resistances. Fuel surface characteristics are analyzed by thermogravimetry, gas adsorption, and X-ray photoelectron spectroscopy, with correlations established using the Pearson correlation analysis. The obtained results show that the surface Si content is strongly correlated with electrolyte resistance due to influencing the concentration of carbonate ions. Moreover, charge transfer resistance is strongly negatively correlated with the surface oxygen content, since oxygenated functional groups (e.g., carbonyl and quinone moieties) enhance the oxidation of solid carbon by increasing its reactivity and wettability. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：885 / 892
页数：8
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