广西大学学报(自然科学版)
廣西大學學報(自然科學版)
엄서대학학보(자연과학판)
JOURNAL OF GUANGXI UNIVERSITY (NATURAL SCIENCE EDITION)
2014年
2期
417-422
,共6页
沈大盛%经辉%蒋津辉%蓝志强%黎光旭
瀋大盛%經輝%蔣津輝%藍誌彊%黎光旭
침대성%경휘%장진휘%람지강%려광욱
储氢合金%高倍率放电性能%循环稳定性%动力学性能
儲氫閤金%高倍率放電性能%循環穩定性%動力學性能
저경합금%고배솔방전성능%순배은정성%동역학성능
hydrogen storge ally%high discharge ability%cycling stability%dynamic performance
采用电磁悬浮感应熔炼法制备La0.55Pr0.15Mg0.2Ni3.05Co0.35-x(AlFe)x(x=0.05,0.10,0.15,0.20,0.25)合金,并利用X 射线衍射( XRD)、高倍率放电性能( HRD)以及塔菲尔曲线( Tafel)对合金相结构和电化学性能进行表征,研究Al和Fe替代Co对La Pr Mg Ni合金相结构以及电化学性能影响。结果表明,合金主要由LaNi5,Pr( Ni,Co)5以及Pr2 MgNi9相组成。添加Al和Fe后,合金电极高倍率放电性能下降,随着Al和Fe替代Co含量的增加,La0.55Pr0.15Mg0.2Ni3.05Co0.35-x(AlFe)x(x=0.05,0.10,0.15,0.20,0.25)合金电极放电平台宽度依次减小。在合金电极表面形成的铝膜不利于氢原子的扩散,导致La0.55 Pr0.15 Mg0.2 Ni3.05 Co0.35-x( AlFe) x (x=0.05,0.10,0.15,0.20,0.25)合金电极极限电流密度下降,但铝膜的抗腐蚀作用使合金电极容量保持率随着Al和Fe含量的增加逐渐增大。
採用電磁懸浮感應鎔煉法製備La0.55Pr0.15Mg0.2Ni3.05Co0.35-x(AlFe)x(x=0.05,0.10,0.15,0.20,0.25)閤金,併利用X 射線衍射( XRD)、高倍率放電性能( HRD)以及塔菲爾麯線( Tafel)對閤金相結構和電化學性能進行錶徵,研究Al和Fe替代Co對La Pr Mg Ni閤金相結構以及電化學性能影響。結果錶明,閤金主要由LaNi5,Pr( Ni,Co)5以及Pr2 MgNi9相組成。添加Al和Fe後,閤金電極高倍率放電性能下降,隨著Al和Fe替代Co含量的增加,La0.55Pr0.15Mg0.2Ni3.05Co0.35-x(AlFe)x(x=0.05,0.10,0.15,0.20,0.25)閤金電極放電平檯寬度依次減小。在閤金電極錶麵形成的鋁膜不利于氫原子的擴散,導緻La0.55 Pr0.15 Mg0.2 Ni3.05 Co0.35-x( AlFe) x (x=0.05,0.10,0.15,0.20,0.25)閤金電極極限電流密度下降,但鋁膜的抗腐蝕作用使閤金電極容量保持率隨著Al和Fe含量的增加逐漸增大。
채용전자현부감응용련법제비La0.55Pr0.15Mg0.2Ni3.05Co0.35-x(AlFe)x(x=0.05,0.10,0.15,0.20,0.25)합금,병이용X 사선연사( XRD)、고배솔방전성능( HRD)이급탑비이곡선( Tafel)대합금상결구화전화학성능진행표정,연구Al화Fe체대Co대La Pr Mg Ni합금상결구이급전화학성능영향。결과표명,합금주요유LaNi5,Pr( Ni,Co)5이급Pr2 MgNi9상조성。첨가Al화Fe후,합금전겁고배솔방전성능하강,수착Al화Fe체대Co함량적증가,La0.55Pr0.15Mg0.2Ni3.05Co0.35-x(AlFe)x(x=0.05,0.10,0.15,0.20,0.25)합금전겁방전평태관도의차감소。재합금전겁표면형성적려막불리우경원자적확산,도치La0.55 Pr0.15 Mg0.2 Ni3.05 Co0.35-x( AlFe) x (x=0.05,0.10,0.15,0.20,0.25)합금전겁겁한전류밀도하강,단려막적항부식작용사합금전겁용량보지솔수착Al화Fe함량적증가축점증대。
La0.55Pr0.15Mg0.2Ni3.05Co0.35-x(AlFe)x(x=0.05,0.10,0.15,0.20,0.25)alloys were pre-pared by magnetic levitation melting under argon atmosphere. The phase structure and electrochemi-cal performance of La0.55Pr0.15Mg0.2Ni3.05Co0.35-x(AlFe)x(x=0.05,0.10,0.15,0.20,0.25)alloys were investigated by means of X-ray diffraction (XRD), high rate discharge ability (HRD) and Tafel testing. The results show that the samples mainly contain LaNi5, Pr(Ni,Co)5 and Pr2MgNi9 phases. The discharge platforms of La0.55 Pr0.15 Mg0.2 Ni3.05 Co0.35-x(AlFe)x(x=0.05,0.10,0.15, 0.20 ,0.25 ) alloy electrodes decrease with the Al and Fe content increasing. Because Al atoms form Al-coating on the surface of the electrodes, which impedes the hydrogen to diffuse, resulting in the decreasing of the limit current of the alloy electrodes. After adding Al and Fe elements, the dis-charge retention rate was improved due to the corrosion resistance of Al-coating.