煤焦酸法脱灰对直接碳燃料电池性能的影响研究  

Effect of the Acid Deashing of Coal Char on the Performance of Direct Carbon Fuel Cells

作　　者：焦勇[1] 王重阳 付艺丽 安文汀[2] 邵宗平[3] 李思殿[1] JIAO Yong;WANG Chongyang;FU Yili;AN Wenting;SHAO Zongping;LI Sidian(Institute of Molecular Science,Key Laboratory of Materials for Energy Comversion and Storage of Shanri,Shanri University,Taiyuan 030006,China;Collegeof Chemistry&Chemical Engineering,Shan.xi University,Taiyuan 030006.China;College of Chemical Engineering.Nanjing Tech University.Nanjing 210009,China)

机构地区：[1]山西大学分子科学研究所能量转化与存储材料山西省重点实验室,山西太原030006 [2]山西大学化学化工学院,中西太原030006 [3]南京工业大学化工学院,江苏南京210009

出　　处：《山西大学学报（自然科学版）》2020年第3期564-570,共7页Journal of Shanxi University(Natural Science Edition)

基　　金：山西省科技攻关项目(20150313003-3);留学回国人员科技活动择优资助项目(2014)。

摘　　要：煤焦是直接碳固体氧化物燃料电池(direct carbon solid oxide fuel cells,DC-SOFCs)的一种潜在碳燃料。煤焦所含的灰分是影响其燃料适用性的重要因素之一。文章利用氢氟酸(HF)和盐酸(HCl)的混合酸(HCl+HF)对煤焦样品进行了脱灰处理。以经HF或HCl处理的单酸脱灰煤焦作为对照样。以混酸脱灰样品为主要研究对象,对其物相结构、微观形貌、化学官能团等理化性质进行了表征。利用二氧化碳程序升温氧化法研究了样品的逆Boudouard反应性能及脱灰处理对以煤焦为燃料的DC-SOFCs电化学性能的影响。结果表明:混酸脱灰煤焦的硅铝灰分含量显著减少,逆Boudouard反应起始温度降低了42℃;以混酸脱灰煤焦为燃料的DC-SOFCs在850℃的最大功率输出是110 mW·cm^(-2),较煤焦原样提高了64.2%;燃料的电化学转化率是煤焦原样的1.23倍。Coal char is a potential carbon fuel for direct carbon solid oxide fuel cells(DC-SOFCs).The ash content of coal char is an important factor influencing its applicability as a fuel for DC-SOFCs.The mixed acid of HF(hydrofluoric acid)and HCl(hydrochloric acid)was used to remove the ash of coal char.Meanwhile,pure HF or HCl was used to treat the coal char samples for comparison.The physicochemical properties of the deashed samples,including phase structures,morphologies and chemical functional groups,were characterized and analyzed.The reactivity of the deashed samples in the reverse Boudouard reaction was examined by the carbon dioxide temperature-programmed oxidation method,and the electrochemical performances of DC-SOFCs fuelled with the deashed samples were studied.The results showed that the silicon and aluminum components of the ash significantly decreased via the treatment of the mixed acid;the initial temperature of the reverse Boudouard reaction of the deashed sample decreased by 42℃;the DC-SOFCs fueled with the coal char deashed by the mixed acid had the maximum power density of 110 mW·cm-2 at 850℃,increasing by 64.2%,and its fuel electrochemical conversion ratio was 1.23 times as high as that of the raw coal char.

关 键 词：直接碳固体氧化物燃料电池 煤焦 酸法脱灰 逆Boudouard反应 电化学性能 

分 类 号：O643.36[理学—物理化学]