双金属
纳米颗粒
材料科学
催化作用
化学工程
过渡金属
纳米技术
电催化剂
耐久性
电化学
金属
化学
物理化学
电极
冶金
复合材料
有机化学
工程类
作者
Ahmad M. Harzandi,Sahar Shadman,Miran Ha,Chang Woo Myung,Dong Yeon Kim,Hyo Ju Park,Siraj Sultan,Woo‐Suk Noh,Wang‐Geun Lee,T. Pandiarajan,Woo Jin Byun,Seong‐Hun Lee,Jitendra N. Tiwari,Tae Joo Shin,Jae‐Hoon Park,Zonghoon Lee,Jae Sung Lee,Kwang S. Kim
标识
DOI:10.1016/j.apcatb.2020.118896
摘要
Properties of metal elements can be modified by alloying. Given that catalytic efficiencies are often maximized using metal single-atoms (SAs), two immiscible metals can improve the catalytic activity when they can be present as non-agglomerated dual SAs. Here, we report yet-unexplored synthesis of high-performance electrocatalysts utilizing immiscibility of Cu/Ru bimetal atoms. In the synthesized electrocatalyst (Cu/[email protected]N), both Cu-SAs and Ru-SAs are dispersed on N-doped graphitic-matrix (GN), while other Cu-SAs are bridged to Ru nanoparticles (NPs) surface via nitrogen. It shows superior mass-activity with outstanding catalytic performance and durability for hydrogen evolution reaction (HER), outperforming commercial Pt20wt%/C. Cu-SAs along with Ru-NPs enhance electric conduction or charge-transfer rate of GN-templates for fast kinetics. Owing to Cu-Ru immiscibility, the coordination of Cu-SAs by N atoms which bridge to Ru-NPs surface, introduces new active sites and brings about long-term stability (over 600 h in acidic media) by preventing aggregation of Ru-NPs.
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