TY - JOUR

T1 - Porosity and thickness effect of Pd–Cu–Si metallic glasses on electrocatalytic hydrogen production and storage

AU - Sarac, Baran

AU - Karazehir, Tolga

AU - Yüce, E.

AU - Mühlbacher, Marlene

AU - Sarac, A. Sezai

AU - Eckert, Jürgen

N1 - Publisher Copyright: © 2021 The Authors

PY - 2021/9/7

Y1 - 2021/9/7

N2 - This contribution places emphasis on tuning pore architecture and film thickness of mesoporous Pd–Cu–Si thin films sputtered on Si/SiO2 substrates for enhanced electrocatalytic and hydrogen sorption/desorption activity and their comparison with the state-of-the-art thin film electrocatalysts. Small Tafel slope of 43 mV dec–1 for 1250 nm thick coating on 2 µm diameter pores with 4.2 µm interspacing electrocatalyst with comparable hydrogen overpotentials to the literature suggests its use for standard fuel cells. The largest hydrogen sorption has been attained for the 250 nm thick electrocatalyst on 5 µm pore diameter with 12 µm interspacing (2189 µC cm−2 per CV cycle), making it possible for rapid storage systems. Moreover, the charge transfer resistance described by an equivalent circuit model has an excellent correlation with Tafel slopes. Along with its very low Tafel slope of 42 mV dec–1 10 nm thick electrocatalyst on 2 µm diameter pores with 4.2 µm interspacing has the highest capacitive response of ∼ 0.001 S sn cm−2 and is promising to be used as a nano-charger and hydrogen sensor. The findings of Si/SiO2 supported mesoporous Pd-based metallic glass (MG) assemblies suggest a similar design applicability for crystalline systems and other MG types.

AB - This contribution places emphasis on tuning pore architecture and film thickness of mesoporous Pd–Cu–Si thin films sputtered on Si/SiO2 substrates for enhanced electrocatalytic and hydrogen sorption/desorption activity and their comparison with the state-of-the-art thin film electrocatalysts. Small Tafel slope of 43 mV dec–1 for 1250 nm thick coating on 2 µm diameter pores with 4.2 µm interspacing electrocatalyst with comparable hydrogen overpotentials to the literature suggests its use for standard fuel cells. The largest hydrogen sorption has been attained for the 250 nm thick electrocatalyst on 5 µm pore diameter with 12 µm interspacing (2189 µC cm−2 per CV cycle), making it possible for rapid storage systems. Moreover, the charge transfer resistance described by an equivalent circuit model has an excellent correlation with Tafel slopes. Along with its very low Tafel slope of 42 mV dec–1 10 nm thick electrocatalyst on 2 µm diameter pores with 4.2 µm interspacing has the highest capacitive response of ∼ 0.001 S sn cm−2 and is promising to be used as a nano-charger and hydrogen sensor. The findings of Si/SiO2 supported mesoporous Pd-based metallic glass (MG) assemblies suggest a similar design applicability for crystalline systems and other MG types.

KW - Electrochemical circuit modeling

KW - Hydrogen evolution reaction

KW - Hydrogen storage

KW - Metallic glass

KW - Polarization

KW - Thin film

UR - http://www.scopus.com/inward/record.url?scp=85114794626&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2021.110099

DO - 10.1016/j.matdes.2021.110099

M3 - Article

AN - SCOPUS:85114794626

VL - 210.2021

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

IS - 15 November

M1 - 110099

ER -