首页|Lattice strain induced by trace Pt single atoms in nickel for accelerating industrial hydrogen evolution
Lattice strain induced by trace Pt single atoms in nickel for accelerating industrial hydrogen evolution
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Strategically designing the electrocatalytic system and cleverly inducing strain is an effective approach to balance the cost and activity of Pt-based electrocatalysts for industrial-scale hydrogen production.Herein,we present a unipolar pulsed electrodeposition(UPED)strategy to induce strain in the Ni lattice by introducing trace amounts of Pt single atoms(SAs)(0.22 wt％).The overpotential decreased by 183 mV at 10 mA cm-2 in 1.0 M KOH after introducing trace amounts of PtsAs.The industrial electrolyzer,assem-bled with PtsAsNi cathode and a commercial NiFeOx anode,requires a cell voltage of 1.90 V to attain 1 A cm-2 of current density and remains stable for 280 h,demonstrating significant potential for practical applications.Spherical aberration corrected scanning transmission electron microscopy(AC-STEM),X-ray absorption(XAS),and geometric phase analysis(GPA)indicate that the introduction of trace amounts of Pt SAs induces tensile strain in the Ni lattice,thereby altering the local electronic structure and coordi-nation environment around cubic Ni for enhancing the water decomposition kinetics and fundamentally changing the reaction pathway.The doping-strain strategy showcases conformational relationships that could offer new ideas to construct efficient hydrogen evolution reaction(HER)electrocatalysts for indus-trial hydrogen production in the future.
Unipolar pulsed electrodepositionPt single atoms,Ni latticeHydrogen evolution reactionH intermediates
Rui Yao、Yun Wu、Kaiyang Zhang、Shuhui Fan、Qiang Zhao、Jinping Li、Guang Liu
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College of Chemical Engineering and Technology,Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China
Shanxi Research Institute of Huairou Laboratory,Taiyuan 030031,Shanxi,China
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