本文主要研究内容
作者黄金晶,丁辰,杨勇强,刘岗,蔡文斌(2019)在《高效氧气还原催化剂Pt3Co/C的水相法新合成(英文)》一文中研究指出:碳载型Pt-Co合金催化剂是一种针对低温燃料电池最实用的阴极氧还原(ORR)催化剂,因此很有必要发展一种简易、环保的合成方法.目前碳载型Pt-Co合金催化剂的合成方法主要包括有机溶剂热法、多元醇还原法、反向微乳液法、浸渍还原法和水相法.其中,有机溶剂热法虽然能较好地实现含Pt双金属纳米合金催化剂的合成,但该方法所用的有机溶剂和封端剂会引起环境污染,同时Pt(acac)2和Co(acac)2前驱体成本较高.多元醇还原法采用乙二醇作为溶剂和还原剂,多元醇溶于水、较易去除是该方法的优点,但该法难以获得制定剂量比的Pt Co合金,且后续需较高温度退火以提高合金度.反向微乳液法能较好地控制颗粒粒径,但金属纳米颗粒组成的均一性较难达成.同时,有机溶剂热法与反向微乳液法均面临去除有机物步骤繁琐且耗时长的问题.浸渍还原法需在H2气氛下高温煅烧含Pt和Co盐浸渍液的碳黑,虽可形成Pt Co有序化合金结构,但易导致Pt Co纳米颗粒的烧结,限制催化剂的质量比活性.水相合成法采用水作为前驱体和络合剂的唯一溶剂,并基于水溶性还原剂一锅法合成,无需强表面活性剂.虽然水相合成法是一种环境友好、成本低廉的合成方法,但其最大挑战是难以按投料金属比合成分散性良好、粒径较小及合金化程度高的Pt Co纳米颗粒,因此需要进一步的发展.本研究首次报道了以一种非经典的二甲基胺硼烷(DMAB)还原剂为基础的水相一锅法合成碳载型Pt Co催化剂(Pt含量约为20 wt.%)的方法.重点合成了具有最优原子比的Pt3Co/C-DMAB催化剂,并与采用Na BH4或N2H4·H2O合成的催化剂Pt3Co/C-Na BH4和Pt3Co/C-N2H4·H2O以及商业化催化剂Pt/C在结构和电催化性能方面进行了对比研究.结果表明,Pt3Co/C-DMAB在O2饱和的0.1 mol L–1 HCl O4溶液中表现出最好的电催化ORR性能,质量比活性与面积比活性分别是商业化Pt/C的4倍和6倍.Pt3Co/C-DMAB在含氧的0.1 mol/L HCl O4溶液中,在0.60和1.05 V(vs.RHE)区间经历了10000圈的电位扫描后,ORR半波电位仅降低了4 m V,而商业化Pt/C催化剂在该条件下半波电位降低了24 m V.Pt3Co/C-Na BH4和Pt3Co/C-N2H4·H2O虽然在面积比活性上与Pt3Co/C-DMAB相近,但前二者的质量比活性与商业化Pt/C的相近.ICP-AES、TEM、XRD和XPS等表征方法表明,除了Pt Co合金有利的电子效应外,Pt3Co/C-DMAB上Pt3Co纳米粒子良好的分散性、较小的平均粒径(约3.4±0.4 nm)和较高的合金度是该催化剂对ORR表现出色性能的成因.这种环保简便的水相合成法将为开发实用型ORR催化剂提供新途径.
Abstract
tan zai xing Pt-Coge jin cui hua ji shi yi chong zhen dui di wen ran liao dian chi zui shi yong de yin ji yang hai yuan (ORR)cui hua ji ,yin ci hen you bi yao fa zhan yi chong jian yi 、huan bao de ge cheng fang fa .mu qian tan zai xing Pt-Coge jin cui hua ji de ge cheng fang fa zhu yao bao gua you ji rong ji re fa 、duo yuan chun hai yuan fa 、fan xiang wei ru ye fa 、jin zi hai yuan fa he shui xiang fa .ji zhong ,you ji rong ji re fa sui ran neng jiao hao de shi xian han Ptshuang jin shu na mi ge jin cui hua ji de ge cheng ,dan gai fang fa suo yong de you ji rong ji he feng duan ji hui yin qi huan jing wu ran ,tong shi Pt(acac)2he Co(acac)2qian qu ti cheng ben jiao gao .duo yuan chun hai yuan fa cai yong yi er chun zuo wei rong ji he hai yuan ji ,duo yuan chun rong yu shui 、jiao yi qu chu shi gai fang fa de you dian ,dan gai fa nan yi huo de zhi ding ji liang bi de Pt Coge jin ,ju hou xu xu jiao gao wen du tui huo yi di gao ge jin du .fan xiang wei ru ye fa neng jiao hao de kong zhi ke li li jing ,dan jin shu na mi ke li zu cheng de jun yi xing jiao nan da cheng .tong shi ,you ji rong ji re fa yu fan xiang wei ru ye fa jun mian lin qu chu you ji wu bu zhou fan suo ju hao shi chang de wen ti .jin zi hai yuan fa xu zai H2qi fen xia gao wen duan shao han Pthe Coyan jin zi ye de tan hei ,sui ke xing cheng Pt Coyou xu hua ge jin jie gou ,dan yi dao zhi Pt Cona mi ke li de shao jie ,xian zhi cui hua ji de zhi liang bi huo xing .shui xiang ge cheng fa cai yong shui zuo wei qian qu ti he lao ge ji de wei yi rong ji ,bing ji yu shui rong xing hai yuan ji yi guo fa ge cheng ,mo xu jiang biao mian huo xing ji .sui ran shui xiang ge cheng fa shi yi chong huan jing you hao 、cheng ben di lian de ge cheng fang fa ,dan ji zui da tiao zhan shi nan yi an tou liao jin shu bi ge cheng fen san xing liang hao 、li jing jiao xiao ji ge jin hua cheng du gao de Pt Cona mi ke li ,yin ci xu yao jin yi bu de fa zhan .ben yan jiu shou ci bao dao le yi yi chong fei jing dian de er jia ji an peng wan (DMAB)hai yuan ji wei ji chu de shui xiang yi guo fa ge cheng tan zai xing Pt Cocui hua ji (Pthan liang yao wei 20 wt.%)de fang fa .chong dian ge cheng le ju you zui you yuan zi bi de Pt3Co/C-DMABcui hua ji ,bing yu cai yong Na BH4huo N2H4·H2Oge cheng de cui hua ji Pt3Co/C-Na BH4he Pt3Co/C-N2H4·H2Oyi ji shang ye hua cui hua ji Pt/Czai jie gou he dian cui hua xing neng fang mian jin hang le dui bi yan jiu .jie guo biao ming ,Pt3Co/C-DMABzai O2bao he de 0.1 mol L–1 HCl O4rong ye zhong biao xian chu zui hao de dian cui hua ORRxing neng ,zhi liang bi huo xing yu mian ji bi huo xing fen bie shi shang ye hua Pt/Cde 4bei he 6bei .Pt3Co/C-DMABzai han yang de 0.1 mol/L HCl O4rong ye zhong ,zai 0.60he 1.05 V(vs.RHE)ou jian jing li le 10000juan de dian wei sao miao hou ,ORRban bo dian wei jin jiang di le 4 m V,er shang ye hua Pt/Ccui hua ji zai gai tiao jian xia ban bo dian wei jiang di le 24 m V.Pt3Co/C-Na BH4he Pt3Co/C-N2H4·H2Osui ran zai mian ji bi huo xing shang yu Pt3Co/C-DMABxiang jin ,dan qian er zhe de zhi liang bi huo xing yu shang ye hua Pt/Cde xiang jin .ICP-AES、TEM、XRDhe XPSdeng biao zheng fang fa biao ming ,chu le Pt Coge jin you li de dian zi xiao ying wai ,Pt3Co/C-DMABshang Pt3Cona mi li zi liang hao de fen san xing 、jiao xiao de ping jun li jing (yao 3.4±0.4 nm)he jiao gao de ge jin du shi gai cui hua ji dui ORRbiao xian chu se xing neng de cheng yin .zhe chong huan bao jian bian de shui xiang ge cheng fa jiang wei kai fa shi yong xing ORRcui hua ji di gong xin tu jing .
论文参考文献
论文详细介绍
论文作者分别是来自Chinese Journal of Catalysis的黄金晶,丁辰,杨勇强,刘岗,蔡文斌,发表于刊物Chinese Journal of Catalysis2019年12期论文,是一篇关于氧还原电催化剂论文,铂钴合金论文,水相合成论文,二甲基胺硼烷论文,结构与性能论文,Chinese Journal of Catalysis2019年12期论文的文章。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Chinese Journal of Catalysis2019年12期论文网站,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:氧还原电催化剂论文; 铂钴合金论文; 水相合成论文; 二甲基胺硼烷论文; 结构与性能论文; Chinese Journal of Catalysis2019年12期论文;