本文主要研究内容
作者张亚东(2019)在《电沉积制备多孔Ni-M-CeO2(M=Mo、W、P)复合镀层及其催化析氢性能研究》一文中研究指出:氢能源是一种最清洁环保的可再生二次能源,目前制约氢能源利用的主要因素包括制取低价氢能源和寻找安全的氢储存技术两个方面。电催化制氢被认为是最有效的持续制备氢气的方法,其中Ni基材料(Ni-Mo、Ni-W、Ni-P等)是常见的催化析氢电极。同时,根据Brewer-Engel价键理论,稀土氧化物往往具有空的d轨道或f轨道,可以与d轨道有成对电子的金属或合金形成电催化析氢协同效应而提高材料的催化析氢活性。因此,本文通过电沉积技术分别制备了Ni-P-CeO2、Ni-Mo-CeO2和Ni-W-CeO2复合镀层,并采用极化曲线(LSV)、交流阻抗(EIS)、Tafel曲线、恒电位I-t曲线和循环伏安曲线(CV)等方法研究了所制备镀层的析氢性能,具体研究结果如下:1.通过复合电沉积法制备了Ni-P-CeO2复合镀层,结果表明:在镀层中Ni-P以非晶态形式存在;多孔Cu模板具有三维泡沫结构,这种结构有大的比表面积,添加多孔Cu模板后镀层的催化析氢性能有所提高;在模板表面电沉积Ni-P-CeO2复合镀层后,针叶状的Cu枝晶变为球形。当加入的纳米CeO2颗粒的浓度为20g/L时,Ni-P-CeO2复合电极获得最佳的电催化析氢活性。Ni-P-CeO2(20g/L)复合镀层的交换电流密度(j0)是Ni-P镀层的5.4倍。当阴极过电位大于149 mV时,Ni-P-CeO2(20g/L)复合镀层的催化活性高于贵金属铂。这说明Ni-P-CeO2复合镀层是一种低成本的高效非贵金属析氢催化剂。2.为了进一步提高Ni-Mo镀层的电催化析氢活性,通过复合电沉积法制备了Ni-Mo-CeO2复合镀层来研究纳米CeO2含量对镀层析氢活性的影响。结果表明:在镀层中Ni-Mo合金以MoNi4晶体的形式存在;电沉积Ni-Mo镀层和Ni-Mo-CeO2复合镀层后的Cu枝晶表面呈多孔状态,气孔在镀层表面均匀分布,镀层表面整体有较大的粗糙度,有利于降低电极表面析氢过程中的电流密度。Ni-Mo-CeO2复合镀层与其对应的Ni-Mo二元合金相比,Ni-Mo-CeO2复合镀层显示出更好的电催化活性。Ni-Mo-CeO2复合镀层比Ni-Mo镀层有更好的电催化析氢活性,是由于纳米CeO2颗粒与Ni-Mo合金之间形成析氢协同效应。3.研究了纳米CeO2颗粒的添加对Ni-W合金镀层表面形貌及催化析氢性能的影响,结果表明:W元素溶入Ni晶格中形成Ni-W固溶体;Ni-W-CeO2复合电极的催化析氢活性随着纳米CeO2颗粒含量的增加先升高后下降,Ni-W-CeO2(10g/L)复合电极显示出最好的电催化析氢活性。通过对Ni-W-CeO2(10g/L)复合电极进行恒电位I-t曲线和循环伏安曲线测试表明复合镀层具有良好的稳定性。Ni-W-CeO2复合电极的电催化活性高于Ni-W电极归因于Ni-W合金和纳米CeO2颗粒之间产生催化析氢协同效应。本文通过在Ni-P、Ni-Mo和Ni-W镀层中加入纳米CeO2颗粒研究稀土氧化物的加入对Ni基镀层析氢性能的影响。通过测试发现加入稀土氧化物后,所有镀层的催化析氢性能都有不同程度的提高,进一步证明Ni基合金与稀土氧化物之间可以形成催化析氢协同效应,进而增强了Ni基合金在碱性溶液中的电催化析氢活性。
Abstract
qing neng yuan shi yi chong zui qing jie huan bao de ke zai sheng er ci neng yuan ,mu qian zhi yao qing neng yuan li yong de zhu yao yin su bao gua zhi qu di jia qing neng yuan he xun zhao an quan de qing chu cun ji shu liang ge fang mian 。dian cui hua zhi qing bei ren wei shi zui you xiao de chi xu zhi bei qing qi de fang fa ,ji zhong Niji cai liao (Ni-Mo、Ni-W、Ni-Pdeng )shi chang jian de cui hua xi qing dian ji 。tong shi ,gen ju Brewer-Engeljia jian li lun ,xi tu yang hua wu wang wang ju you kong de dgui dao huo fgui dao ,ke yi yu dgui dao you cheng dui dian zi de jin shu huo ge jin xing cheng dian cui hua xi qing xie tong xiao ying er di gao cai liao de cui hua xi qing huo xing 。yin ci ,ben wen tong guo dian chen ji ji shu fen bie zhi bei le Ni-P-CeO2、Ni-Mo-CeO2he Ni-W-CeO2fu ge du ceng ,bing cai yong ji hua qu xian (LSV)、jiao liu zu kang (EIS)、Tafelqu xian 、heng dian wei I-tqu xian he xun huan fu an qu xian (CV)deng fang fa yan jiu le suo zhi bei du ceng de xi qing xing neng ,ju ti yan jiu jie guo ru xia :1.tong guo fu ge dian chen ji fa zhi bei le Ni-P-CeO2fu ge du ceng ,jie guo biao ming :zai du ceng zhong Ni-Pyi fei jing tai xing shi cun zai ;duo kong Cumo ban ju you san wei pao mo jie gou ,zhe chong jie gou you da de bi biao mian ji ,tian jia duo kong Cumo ban hou du ceng de cui hua xi qing xing neng you suo di gao ;zai mo ban biao mian dian chen ji Ni-P-CeO2fu ge du ceng hou ,zhen xie zhuang de Cuzhi jing bian wei qiu xing 。dang jia ru de na mi CeO2ke li de nong du wei 20g/Lshi ,Ni-P-CeO2fu ge dian ji huo de zui jia de dian cui hua xi qing huo xing 。Ni-P-CeO2(20g/L)fu ge du ceng de jiao huan dian liu mi du (j0)shi Ni-Pdu ceng de 5.4bei 。dang yin ji guo dian wei da yu 149 mVshi ,Ni-P-CeO2(20g/L)fu ge du ceng de cui hua huo xing gao yu gui jin shu bo 。zhe shui ming Ni-P-CeO2fu ge du ceng shi yi chong di cheng ben de gao xiao fei gui jin shu xi qing cui hua ji 。2.wei le jin yi bu di gao Ni-Modu ceng de dian cui hua xi qing huo xing ,tong guo fu ge dian chen ji fa zhi bei le Ni-Mo-CeO2fu ge du ceng lai yan jiu na mi CeO2han liang dui du ceng xi qing huo xing de ying xiang 。jie guo biao ming :zai du ceng zhong Ni-Moge jin yi MoNi4jing ti de xing shi cun zai ;dian chen ji Ni-Modu ceng he Ni-Mo-CeO2fu ge du ceng hou de Cuzhi jing biao mian cheng duo kong zhuang tai ,qi kong zai du ceng biao mian jun yun fen bu ,du ceng biao mian zheng ti you jiao da de cu cao du ,you li yu jiang di dian ji biao mian xi qing guo cheng zhong de dian liu mi du 。Ni-Mo-CeO2fu ge du ceng yu ji dui ying de Ni-Moer yuan ge jin xiang bi ,Ni-Mo-CeO2fu ge du ceng xian shi chu geng hao de dian cui hua huo xing 。Ni-Mo-CeO2fu ge du ceng bi Ni-Modu ceng you geng hao de dian cui hua xi qing huo xing ,shi you yu na mi CeO2ke li yu Ni-Moge jin zhi jian xing cheng xi qing xie tong xiao ying 。3.yan jiu le na mi CeO2ke li de tian jia dui Ni-Wge jin du ceng biao mian xing mao ji cui hua xi qing xing neng de ying xiang ,jie guo biao ming :Wyuan su rong ru Nijing ge zhong xing cheng Ni-Wgu rong ti ;Ni-W-CeO2fu ge dian ji de cui hua xi qing huo xing sui zhao na mi CeO2ke li han liang de zeng jia xian sheng gao hou xia jiang ,Ni-W-CeO2(10g/L)fu ge dian ji xian shi chu zui hao de dian cui hua xi qing huo xing 。tong guo dui Ni-W-CeO2(10g/L)fu ge dian ji jin hang heng dian wei I-tqu xian he xun huan fu an qu xian ce shi biao ming fu ge du ceng ju you liang hao de wen ding xing 。Ni-W-CeO2fu ge dian ji de dian cui hua huo xing gao yu Ni-Wdian ji gui yin yu Ni-Wge jin he na mi CeO2ke li zhi jian chan sheng cui hua xi qing xie tong xiao ying 。ben wen tong guo zai Ni-P、Ni-Mohe Ni-Wdu ceng zhong jia ru na mi CeO2ke li yan jiu xi tu yang hua wu de jia ru dui Niji du ceng xi qing xing neng de ying xiang 。tong guo ce shi fa xian jia ru xi tu yang hua wu hou ,suo you du ceng de cui hua xi qing xing neng dou you bu tong cheng du de di gao ,jin yi bu zheng ming Niji ge jin yu xi tu yang hua wu zhi jian ke yi xing cheng cui hua xi qing xie tong xiao ying ,jin er zeng jiang le Niji ge jin zai jian xing rong ye zhong de dian cui hua xi qing huo xing 。
论文参考文献
论文详细介绍
论文作者分别是来自江西理工大学的张亚东,发表于刊物江西理工大学2019-09-23论文,是一篇关于电沉积论文,析氢论文,稀土氧化物论文,电解水论文,复合镀层论文,江西理工大学2019-09-23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,资料来自江西理工大学2019-09-23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。