本文主要研究内容
作者张晓伟(2019)在《燃料电池用质子交换膜和高效电催化剂的制备与研究》一文中研究指出:质子交换膜燃料电池(PEMFC)是一种直接将燃料中的化学能转化为电能的装置,具有高效节能、工作稳定、环境友好等优点,是21世纪最清洁高效的发电技术之一。PEMFC中质子交换膜(PEM)和电催化剂是决定其性能的关键材料。由于PEM膜在高温低湿度环境中低的质子传导性,电催化剂的活性和稳定性有待提高,以及电催化剂成本太高等问题,至今没能实现PEMFC的大规模生产和应用。(1)本论文通过一步法原位还原碳化制备电催化剂Pt/WCx/C。利用X射线衍射(XRD)、场发射扫面电镜(SEM)、透射电镜(TEM)和能谱(EDS)对制备的电催化剂进行结构表征。结果表明Pt与WC充分接触,随着WC含量的增加,催化剂粒径由5 nm左右逐渐增加到25 nm左右。电化学测试结果表明,对甲醇催化氧化中Pt/WC20%/C的峰电流密度达到556.20 mA mgPt-1,高于商业Pt/C(ETEK)近150 mA mgPt-1;在CO溶出伏安曲线中Pt/WC25%/C的峰电位在0.55 V,ETEK的峰电位为0.66 V,高于Pt/WC25%/C约0.11 V。说明WC的引入能显著提高催化剂的催化性能,使催化剂在更低的电位下将CO氧化,提高抗CO中毒能力。因此该合成方法在一定程度上促进了PEMFC电催化剂的发展。(2)通过电沉积法将不同比例的PdCo沉积在石墨烯(rGO)表面,制备出PdxCoy/rGO电催化剂。利用SEM、TEM、EDS和傅里叶红外(FTIR)对制备的电催化剂进行结构表征。结果表明制备出的催化剂中PdCo摩尔比与电解液中Pd2+、Co2+离子浓度比值基本一致;二元金属催化剂比一元金属催化剂的粒径更小;其中样品Pd1Co3/rGO的颗粒粒径最小。电化学测试结果表明,Pd1Co3/rGO表现出最大的电化学活性面积(ECSA);对甲酸表现出最高的电催化活性以及最好的抗CO中毒能力和稳定性。说明以rGO为载体,利用电沉积法制备的Pd1Co3/rGO催化剂在PEMFC催化剂领域具有潜在的应用价值。(3)通过对中空介孔二氧化硅微球(HMSN)真空注入磷钨酸(HPW)得到HMSN-I。将HMSN-I作为无机填料制备高度有序介孔结构的有机-无机复合高温质子交换膜(Nafion/HMSN-I)。利用SEM、TEM、比表面积测试(BET)和FTIR对Nafion/HMSN-I的结构进行表征。结果表明,HPW注入在HMSN内部以及壳层介孔结构中。电池性能测试结果表明,在120℃、50%RH条件下Nafion/HMSN-I复合膜的输出功率为230 mW cm-2,是传统Nafion 115膜相同条件下的3.8倍。
Abstract
zhi zi jiao huan mo ran liao dian chi (PEMFC)shi yi chong zhi jie jiang ran liao zhong de hua xue neng zhuai hua wei dian neng de zhuang zhi ,ju you gao xiao jie neng 、gong zuo wen ding 、huan jing you hao deng you dian ,shi 21shi ji zui qing jie gao xiao de fa dian ji shu zhi yi 。PEMFCzhong zhi zi jiao huan mo (PEM)he dian cui hua ji shi jue ding ji xing neng de guan jian cai liao 。you yu PEMmo zai gao wen di shi du huan jing zhong di de zhi zi chuan dao xing ,dian cui hua ji de huo xing he wen ding xing you dai di gao ,yi ji dian cui hua ji cheng ben tai gao deng wen ti ,zhi jin mei neng shi xian PEMFCde da gui mo sheng chan he ying yong 。(1)ben lun wen tong guo yi bu fa yuan wei hai yuan tan hua zhi bei dian cui hua ji Pt/WCx/C。li yong Xshe xian yan she (XRD)、chang fa she sao mian dian jing (SEM)、tou she dian jing (TEM)he neng pu (EDS)dui zhi bei de dian cui hua ji jin hang jie gou biao zheng 。jie guo biao ming Ptyu WCchong fen jie chu ,sui zhao WChan liang de zeng jia ,cui hua ji li jing you 5 nmzuo you zhu jian zeng jia dao 25 nmzuo you 。dian hua xue ce shi jie guo biao ming ,dui jia chun cui hua yang hua zhong Pt/WC20%/Cde feng dian liu mi du da dao 556.20 mA mgPt-1,gao yu shang ye Pt/C(ETEK)jin 150 mA mgPt-1;zai COrong chu fu an qu xian zhong Pt/WC25%/Cde feng dian wei zai 0.55 V,ETEKde feng dian wei wei 0.66 V,gao yu Pt/WC25%/Cyao 0.11 V。shui ming WCde yin ru neng xian zhe di gao cui hua ji de cui hua xing neng ,shi cui hua ji zai geng di de dian wei xia jiang COyang hua ,di gao kang COzhong du neng li 。yin ci gai ge cheng fang fa zai yi ding cheng du shang cu jin le PEMFCdian cui hua ji de fa zhan 。(2)tong guo dian chen ji fa jiang bu tong bi li de PdCochen ji zai dan mo xi (rGO)biao mian ,zhi bei chu PdxCoy/rGOdian cui hua ji 。li yong SEM、TEM、EDShe fu li xie gong wai (FTIR)dui zhi bei de dian cui hua ji jin hang jie gou biao zheng 。jie guo biao ming zhi bei chu de cui hua ji zhong PdComa er bi yu dian jie ye zhong Pd2+、Co2+li zi nong du bi zhi ji ben yi zhi ;er yuan jin shu cui hua ji bi yi yuan jin shu cui hua ji de li jing geng xiao ;ji zhong yang pin Pd1Co3/rGOde ke li li jing zui xiao 。dian hua xue ce shi jie guo biao ming ,Pd1Co3/rGObiao xian chu zui da de dian hua xue huo xing mian ji (ECSA);dui jia suan biao xian chu zui gao de dian cui hua huo xing yi ji zui hao de kang COzhong du neng li he wen ding xing 。shui ming yi rGOwei zai ti ,li yong dian chen ji fa zhi bei de Pd1Co3/rGOcui hua ji zai PEMFCcui hua ji ling yu ju you qian zai de ying yong jia zhi 。(3)tong guo dui zhong kong jie kong er yang hua gui wei qiu (HMSN)zhen kong zhu ru lin wu suan (HPW)de dao HMSN-I。jiang HMSN-Izuo wei mo ji tian liao zhi bei gao du you xu jie kong jie gou de you ji -mo ji fu ge gao wen zhi zi jiao huan mo (Nafion/HMSN-I)。li yong SEM、TEM、bi biao mian ji ce shi (BET)he FTIRdui Nafion/HMSN-Ide jie gou jin hang biao zheng 。jie guo biao ming ,HPWzhu ru zai HMSNnei bu yi ji ke ceng jie kong jie gou zhong 。dian chi xing neng ce shi jie guo biao ming ,zai 120℃、50%RHtiao jian xia Nafion/HMSN-Ifu ge mo de shu chu gong lv wei 230 mW cm-2,shi chuan tong Nafion 115mo xiang tong tiao jian xia de 3.8bei 。
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论文详细介绍
论文作者分别是来自辽宁科技大学的张晓伟,发表于刊物辽宁科技大学2019-11-25论文,是一篇关于电催化剂论文,电沉积论文,燃料电池论文,质子交换膜论文,碳化钨论文,辽宁科技大学2019-11-25论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自辽宁科技大学2019-11-25论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。
标签:电催化剂论文; 电沉积论文; 燃料电池论文; 质子交换膜论文; 碳化钨论文; 辽宁科技大学2019-11-25论文;