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Dislocation‐Strained IrNi Alloy Nanoparticles Driven by Thermal Shock for the Hydrogen Evolution Reaction
Author(s) -
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
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202006034
Subject(s) - materials science , overpotential , dislocation , nanoparticle , catalysis , density functional theory , nanotechnology , quenching (fluorescence) , chemical engineering , hydrogen , chemical physics , electrochemistry , composite material , chemistry , computational chemistry , biochemistry , physics , organic chemistry , electrode , quantum mechanics , engineering , fluorescence
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.