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SUMMARY:Breaking the scaling relation for the Tafel hydrogen evolution ste
 p by proximity induced magnetism - Gilberto Teobaldi\, STFC UKRI
DTSTART:20250310T143000Z
DTEND:20250310T150000Z
UID:TALK228157@talks.cam.ac.uk
CONTACT:Dr Sun-Woo Kim
DESCRIPTION:To electrify society\, new electrocatalysts with higher turnov
 er frequencies and decreased overpotentials are needed. New materials are 
 sought that change the energy of intermediates and transition states on th
 e reaction pathway to deliver a change in rate. But a fundamental challeng
 e is that scaling relationships exist for many electrocatalytic mechanisms
 . These relationships limit the maximum achievable activity and the effici
 ency of electrocatalytic energy generation.\n\nHere\, we present a Density
  Functional Theory (DFT) study of the role of spin-polarisation at Au and 
 Pt surfaces for the kinetics of the Tafel Hydrogen Evolution Step (THES). 
 The DFT simulations uncover an electrode-dependent response to spin-polari
 sation at the surface with the ensuing possibility of both increasing (Pt)
  or decreasing (Au) the rate-determining barrier for the THES. The DFT sim
 ulations identify the leading terms of the calculated THES enhancement (Pt
 ) and suppression (Au) in the different electronic and phonon (zero-point 
 energies and vibrational entropy) responses to spin-polarisation at the el
 ectrode surface. Electrochemical characterization of the THES in Ar-satura
 ted 0.5 M KHCO3 solution on Au and Pt thin-film capped\, ferromagnetic mul
 ti-layer (Pt/CoxBy/Ir) electrodes confirms increases of up to 30% for Pt (
 -0.15 V vs. RHE)\, and over 95% suppression for Au (-0.5 V vs. RHE)\, depe
 nding on the thickness of the catalytic cap [1]. The approach\, understood
  to rest on proximity induced magnetism at the Pt and Au thin-films\, open
 s new scalable avenues to circumvent scaling relations on existing electro
 catalyst surfaces\, which could be applied to a range of sustainable chemi
 stry and energy applications.\n \n\n[1] UKIPO Application No. 2415085.6 (1
 4/10/2024)\n\n 
LOCATION:zoom.us/j/92447982065?pwd=RkhaYkM5VTZPZ3pYSHptUXlRSkppQT09
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