高比表面积、结构确定的贵金属纳米晶的电催化剂材料的构建
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- 英文论文题名：The Construction of Noble Metal Nanocrystal Electrocatalysts with High Specific Surface Area and Well-defined Surface Structure
- 论文作者：陈巧丽 ; 贾艳艳 ; 曹振明 ; 谢兆雄
- 英文论文作者：Qiaoli Chen ; Yanyan Jia ; Zhenming Cao ; Zhaoxiong Xie ; College of Chem.& Chem.Engin. ; Xiamen Univ.
- 年：2016
- 作者机构：厦门大学化学化工学院;
- 论文关键词：贵金属 ; 纳米晶 ; 片状内凹结构 ; 电催化
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十九分会：电化学材料
- 语种：中文
- 分类号：O643.36
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十九分会 ; 电化学材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：171k
- 原文格式：D
- 会议级别：全国
摘要
贵金属纳米晶在电催化领域有着重要的应用。由于贵金属资源匮乏和价格昂贵,人们致力于提高其活性和减少其用量。发展的方法主要有两种:其一是通过形成小尺寸纳米晶获得大的比表面积以提高原子利用率,其二是形成特定晶面的纳米晶以获得最优的催化活性。然而,这两种方法似乎是矛盾的,因为很小尺寸纳米晶无法保留特定的晶面,而具有较大尺寸多面体结构的纳米晶才可能具有特定的晶面。从晶体形貌和表面结构关系角度来看,片状内凹多面体结构可以打破这种对立关系。片状内凹多面体是指由特定晶面裸露的超薄纳米片构筑起来的高度内凹的三维结构,具有极大的比表面积和确定晶面。因此,片状内凹结构是最理想的、具有应用前景的催化剂纳米晶的形貌。近几年,我们致力于探索合成片状内凹贵金属纳米晶。2014年,我们报导了首例由{110}晶面裸露的超薄纳米片构筑的内凹菱形十二面体PtCu_3合金纳米晶,它的表面积高达78 m~2/g。此外,我们在以种子法来深入研究片状内凹纳米晶形成机理的基础上,设计出了简单的一步合成片状内凹三八面体Au纳米晶和AuPd合金纳米晶的方法。
Noble metal nanocrystals(NCs) have been widely used as electrocatalysts. Considering the high cost and low abundance, two main methods have been developed for enhancing the activity and decreasing the usage of noble metal catalysts, which are regulating NCs with small size and exposing specific crystal facets. However, the two methods seem to be incompatible as small NCs are difficult to company with specific facet while well-faceted NCs usually possess large size. The NCs with excavated polyhedral structures, which are constructed by orderly assembling of ultrathin nanosheets, well gather large surface area and well-defined facets, thus are one of the most ideal morphology of nanocrystals for catalytic applications. Recently, we devoted in synthesis of noble metal excavated polyhedral NCs with high surface area and well-defined facets. For example, we reported the first case of {110} facets exposed excavated rhombic dodecahedral PtCu_3 alloy NCs, which exhibit extremely large surface area(78 m~2/g). Besides, a facile one-step synthesis for excavated trioctahedral Au and Au-Pd NCs was realized, based on the understanding of the growth mechanism of excavated polyhedral structure.
Noble metal nanocrystals(NCs) have been widely used as electrocatalysts. Considering the high cost and low abundance, two main methods have been developed for enhancing the activity and decreasing the usage of noble metal catalysts, which are regulating NCs with small size and exposing specific crystal facets. However, the two methods seem to be incompatible as small NCs are difficult to company with specific facet while well-faceted NCs usually possess large size. The NCs with excavated polyhedral structures, which are constructed by orderly assembling of ultrathin nanosheets, well gather large surface area and well-defined facets, thus are one of the most ideal morphology of nanocrystals for catalytic applications. Recently, we devoted in synthesis of noble metal excavated polyhedral NCs with high surface area and well-defined facets. For example, we reported the first case of {110} facets exposed excavated rhombic dodecahedral PtCu_3 alloy NCs, which exhibit extremely large surface area(78 m~2/g). Besides, a facile one-step synthesis for excavated trioctahedral Au and Au-Pd NCs was realized, based on the understanding of the growth mechanism of excavated polyhedral structure.
引文
[1]Jia,Y.;Jiang,Y.;Zhang,J.;Zhang,L.;Chen,Q.;Xie,Z.;Zheng,L.J.Am.Chem.Soc.;2014,136:3748.
[2]Chen,Q.;Jia,Y.;Shen,W.;Xie,S.;Yang,Y.;Cao,Z.;Xie,Z.;Zheng,L.Nanoscale,2015,7:10728.
[2]Chen,Q.;Jia,Y.;Shen,W.;Xie,S.;Yang,Y.;Cao,Z.;Xie,Z.;Zheng,L.Nanoscale,2015,7:10728.