Facile Fabrication of Robust Hydrogen Evolution Electrodes under High Current Densities via Pt@Cu Interactions. (6th August 2021)

• Record Type: Journal Article
• Authors: Tan, Yeshu; Xie, Ruikuan; Zhao, Siyu; Lu, Xuekun; Liu, Longxiang; Zhao, Fangjia; Li, Chunzhong; Jiang, Hao; Chai, Guoliang; Brett, Dan J. L.; Shearing, Paul R.; He, Guanjie; Parkin, Ivan P.
• Is Part Of: Advanced functional materials. Volume 31:Number 45(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-08-06
• Subjects: high current density -- hydrogen evolution -- Pt nanocrystals -- Pt@Cu interaction -- self‐standing; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202105579
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Durable and efficient hydrogen evolution reaction (HER) electrocatalysts that can satisfy industrial requirements need to be developed. Platinum (Pt)‐based catalysts represent the benchmark performance but are less studied for HER under high current densities in neutral electrolytes due to their high cost, poor stability, and extra water dissociation step. Here a facile and low‐temperature synthesis for constructing "blackberry‐shaped" Pt nanocrystals on copper (Cu) foams with low loading as self‐standing electrodes for HER in neutral media is proposed. Optimized hydrogen adsorption free energy and robust interaction induced by charge density exchange between Pt and Cu ensure the efficient and robust HER, especially under high current densities, which are demonstrated from both experimental and theoretical approaches. The electrode exhibits small overpotentials of 35 and 438 mV to reach current densities of ‐10 and ‐1000 mA cm −2, respectively. Meanwhile the electrode illustrates outstanding stability during chronoamperometry measurement under high current densities (‐100 to ‐400 mA cm −2 ) and 1000 cycles linear sweep voltammetry tests reaching ‐1000 mA cm −2 . This study provides new design strategies for self‐standing electrocatalysts by fabricating robust metal–metal interactions between active materials and current collectors, thus facilitating the stable function of electrodes for HER under technologically relevant high current densities. Abstract : The facile in situ growth of blackberry‐shaped Pt nanocrystals on Cu foams as self‐standing hydrogen evolution reaction (HER) electrode is presented. The optimized hydrogen adsorption free energy and robust interaction between active materials and current collectors induced by charge density exchange ensure high efficiency and durability for HER in neutral media under technologically relevant high current densities.