| Title | Dislocation-Strained IrNi Alloy Nanoparticles Driven by Thermal Shock for the Hydrogen Evolution Reaction |
| Authors | Liu, Siliang Hu, Zheng Wu, Yizeng Zhang, Jinfeng Zhang, Yang Cui, Baihua Liu, Chang Hu, Shi Zhao, Naiqin Han, Xiaopeng Cao, Anyuan Chen, Yanan Deng, Yida Hu, Wenbin |
| Affiliation | Tianjin Univ, Sch Mat Sci & Engn, Key Lab Adv Ceram & Machining Technol, Tianjin Key Lab Composite & Funct Mat,Minist Educ, Tianjin 300072, Peoples R China Tianjin Univ, Sch Sci, Dept Chem, Tianjin Key Lab Mol Optoelect Sci, Tianjin 300072, Peoples R China Peking Univ, Dept Adv Mat & Nanotechnol, Coll Engn, Beijing 100871, Peoples R China Tianjin Univ, Sch Mat Sci & Engn, Key Lab Adv Joining Technol, Tianjin 300072, Peoples R China Tianjin Univ, Joint Sch Natl Univ Singapore & Tianjin Univ, Int Campus, Fuzhou 350207, Peoples R China |
| Keywords | GRAPHENE FILMS |
| Issue Date | Oct-2020 |
| Publisher | ADVANCED MATERIALS |
| Abstract | Designing high-performance and low-cost electrocatalysts is crucial for the electrochemical production of hydrogen. Dislocation-strained IrNi nanoparticles loaded on a carbon nanotube sponge (DSIrNi@CNTS) driven by unsteady thermal shock in an extreme environment are reported here as a highly efficient hydrogen evolution reaction (HER) catalyst. Experimental results demonstrate that numerous dislocations are kinetically trapped in self-assembled IrNi nanoparticles due to the ultrafast quenching and different atomic radii, which can induce strain effects into the IrNi nanoparticles. Such strain-induced high-energy surface structures arising from bulk defects (dislocations), are more likely to be resistant to surface restructuring during catalysis. The catalyst exhibits outstanding HER activity with only 17 mV overpotential to achieve 10 mA cm(-2) in an alkaline electrolyte with fabulous stability, exceeding state-of-the-art Pt/C catalysts. These density functional theory results demonstrate that the electronic structure of as-synthesized IrNi nanostructure can be optimized by the strain effects induced by the dislocations, and the free energy of HER can be tuned toward the optimal region. |
| URI | http://hdl.handle.net/20.500.11897/607976 |
| ISSN | 0935-9648 |
| DOI | 10.1002/adma.202006034 |
| Indexed | SCI(E) |
| Appears in Collections: | 工学院 |
