A facile reflux procedure to increase active surface sites form highly active and durable supported palladium@platinum bimetallic nanodendrites
A facile reflux procedure to increase active surface sites form highly active and durable supported palladium@platinum bimetallic nanodendrites
复制标题
一种简便的回流程序，可增加活性表面位点，形成高活性和耐用的负载钯@铂双金属纳米枝晶
DOI：
10.1016/j.jpowsour.2015.07.099
复制
发表时间：
2015-11
影响因子：
9.2
通讯作者：
Jun Zhang
中科院分区：
文献类型：
--
作者：
Guangran Xu;Geng Zhang;Qi Zhao;Jun Zhang
采用不同的封端剂制备了一系列均匀负载于XC-72炭黑上的Pd@Pt纳米枝晶。这些封端剂对于支化形态控制是必不可少的。然而，吸附在纳米枝晶表面的表面活性剂阻止了反应物分子进入活性表面位点，这些纳米枝晶的催化活性受到显着限制。在此，报道了一种用于活化负载型纳米催化剂的简便回流程序，其有效地除去封端剂分子而不显著影响其尺寸。更重要的是，还可以保留纳米枝晶的结构和形态，提高活性表面位点的数量、对甲醇和乙醇电氧化反应的催化活性和稳定性。与未处理的催化剂和商业Pt/C和Pd/C催化剂相比，所获得的热水回流处理的Pd@Pt/C催化剂在表面和质量比活性方面表现出上级的催化活性和稳定性。我们预计这种有效且简便的去除方法对用各种表面活性剂制备的高活性纳米催化剂具有更普遍的适用性，并且应该会带来环境保护和能源生产的改善。
A series of well-dispersed bimetallic Pd@Pt nanodendrites uniformly supported on XC-72 carbon black are fabricated by using different capping agents. These capping agents are essential for the branched morphology control. However, the surfactant adsorbed on the nanodendrites surface blocks the access of reactant molecules to the active surface sites, and the catalytic activities of these bimetallic nanodendrites are significantly restricted. Herein, a facile reflux procedure to effectively remove the capping agent molecules without significantly affecting their sizes is reported for activating supported nanocatalysts. More significantly, the structure and morphology of the nanodendrites can also be retained, enhancing the numbers of active surface sites, catalytic activity and stability toward methanol and ethanol electro-oxidation reactions. The as-obtained hot water reflux-treated Pd@Pt/C catalyst manifests superior catalytic activity and stability both in terms of surface and mass specific activities, as compared to the untreated catalysts and the commercial Pt/C and Pd/C catalysts. We anticipate that this effective and facile removal method has more general applicability to highly active nanocatalysts prepared with various surfactants, and should lead to improvements in environmental protection and energy production.
登录
查看更多内容
介孔石墨烯纳米碗作为铂电催化剂支持高活性和稳定的甲醇氧化
影响因子：
9.2
作者：
Jiang, Zhifeng;Wei, Wei;Gao, Lina;Xie, Jimin
通讯作者：
Xie, Jimin
原位还原绿色合成石墨烯上Pt-on-Pd双金属纳米枝晶及其增强的甲醇氧化电催化活性
影响因子：
6.6
作者：
Cai Zhixiong;Liu Congcong;Wu Genghuang;Chen Xiaomei;Chen Xi
通讯作者：
Chen Xi
影响因子：
--
作者：
Jiening Zheng;Jing-Jing Lv-Jing;Shan-Shan Li-Shan;Meng-Wei Xue;Ai-Jun Wang;Jiu-Ju Feng
通讯作者：
Jiening Zheng;Jing-Jing Lv-Jing;Shan-Shan Li-Shan;Meng-Wei Xue;Ai-Jun Wang;Jiu-Ju Feng
影响因子：
15
作者：
Wang, Liang;Nemoto, Yoshihiro;Yamauchi, Yusuke
通讯作者：
Yamauchi, Yusuke
影响因子：
9.2
作者：
Ye Wang;Feifei Shi;Yao-Yue Yang;W. Cai
通讯作者：
Ye Wang;Feifei Shi;Yao-Yue Yang;W. Cai