Cycling potential engineering surface configuration of sandwich Au@Ni@PtNiAu for superior catalytic durability
Cycling potential engineering surface configuration of sandwich Au@Ni@PtNiAu for superior catalytic durability
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三明治结构 Au@Ni@PtNiAu 的循环潜在工程表面构型具有卓越的催化耐久性
DOI：
10.1016/j.nanoen.2018.07.029
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发表时间：
2018-10-01
期刊：
影响因子：
17.6
通讯作者：
Guo, Lin
中科院分区：
文献类型：
--
作者：
Chen, Ting-Wen;Huang, Wei-Feng;Guo, Lin
我们报告的建设Au@Ni@ PtNi Au三明治纳米结构的循环电位响应的表面配置作为催化剂，同时具有高活性和上级耐久性，但最小化的Pt的使用。非晶态Ni中间层的原子迁移容限使Au偏聚表面在较高电位（0.6-1.4 V）循环后容易回复到Pt主导的表面，而这些偏聚表面通过阻塞活性位而导致活性下降。Pt主导的表面与下面密封的Au原子赋予催化剂上级电化学活性和稳定性。其对甲醇氧化反应的比活性（莫尔比，2.05 mA cm（-2））是商品Pt/C（0.33 mA cm（-2））的6倍。电化学活性表面积（ECSA）和莫尔活性都没有损失，但在长达10，在0.6-1.4 V的电势下，在0.5 M H2SO 4中进行了0.000次循环。壳结构揭示了Ni中间层还用作在电化学过程中补偿PtNiAu壳中可能溶解的Ni的来源，从而确保保持良好的催化活性。
We report the construction of Au@Ni@PtNiAu sandwich nanostructures of cycling-potential-responsive surface configurations as catalyst with simultaneous high activity and superior durability but minimized Pt usage. The atom migration tolerance of the amorphous Ni interlayer in the structure makes the Au segregated surface, which cause activity degradation by blocking active sites, easy to reverse back to Pt-dominated one after cycling under higher potential (0.6-1.4 V). The Pt-dominated surface with underneath sealed Au atoms gives the catalyst superior electrochemical activity and stability. Its specific activity towards methanol oxidation reaction (MOR, 2.05 mA cm(-2)) is as high as 6 times of commercial Pt/C (0.33 mA cm(-2)). Both the electrochemically active surface area (ECSA) and MOR activity experience no loss but a slight increase after as long as 10,000 cycles in 0.5 M H2SO4 under the potential of 0.6-1.4 V. The comparison with Au@PtNiAu core-shell structure reveals the Ni interlayer also serves as a source to compensate the possibly dissolved Ni in the PtNiAu shell during the electrochemical process and thus ensures the well-maintained catalytic activity.