TY - JOUR
T1 - Hydrogen egress from palladium surfaces
T2 - A microelectrode-based investigation
AU - Zhang, S.
AU - Nairn, K.
AU - Musameh, M.
AU - Thomas, S.
N1 - Funding Information:
S. Z acknowledges the Monash Graduate Scholarship from Monash University. S. Z and S. T gratefully acknowledge support from Shravan Kairy (now at NPL, UK), and Nick Birbilis (Deakin University, Australia). S. Z. and S. T. would like to acknowledge CSIRO.
Funding Information:
S. Z acknowledges the Monash Graduate Scholarship from Monash University. S. Z and S. T gratefully acknowledge support from Shravan Kairy (now at NPL, UK), and Nick Birbilis (Deakin University, Australia). S. Z. and S. T. would like to acknowledge CSIRO.
Publisher Copyright:
© 2023 The Author(s)
PY - 2023/10/1
Y1 - 2023/10/1
N2 - Atomic hydrogen could participate in multiple electrochemical reactions during egress from Palladium (Pd) into aqueous environments. Possible reactions include hydrogen recombination to form H2, the oxygen reduction reaction (ORR) and “hydrogen ionisation” to form H+. Here, bulk measurements and microelectrode-based methods were used to mechanistically investigate such reactions occurring during hydrogen egress from Pd. Significant ORR was detected on hydrogen-charged Pd (Pd-H) surfaces, when using a Platinum (Pt) microelectrode (ME) in the redox competition mode. However, minor hydrogen recombination was also detected while using the Pt ME in the sample generation-tip collection (SG-TC) mode. Hydrogen ionisation is observed to occur when Pd (H) is anodically polarised. These reactions can all be linked to the highly negative equilibrium potential of the atomic H/H+ redox couple. Atomic hydrogen being a strong reducing agent thus tends to efficiently reduce various oxidants in solution resulting in different products, under varying conditions.
AB - Atomic hydrogen could participate in multiple electrochemical reactions during egress from Palladium (Pd) into aqueous environments. Possible reactions include hydrogen recombination to form H2, the oxygen reduction reaction (ORR) and “hydrogen ionisation” to form H+. Here, bulk measurements and microelectrode-based methods were used to mechanistically investigate such reactions occurring during hydrogen egress from Pd. Significant ORR was detected on hydrogen-charged Pd (Pd-H) surfaces, when using a Platinum (Pt) microelectrode (ME) in the redox competition mode. However, minor hydrogen recombination was also detected while using the Pt ME in the sample generation-tip collection (SG-TC) mode. Hydrogen ionisation is observed to occur when Pd (H) is anodically polarised. These reactions can all be linked to the highly negative equilibrium potential of the atomic H/H+ redox couple. Atomic hydrogen being a strong reducing agent thus tends to efficiently reduce various oxidants in solution resulting in different products, under varying conditions.
KW - Hydrogen
KW - Hydrogen detection
KW - Hydrogen embrittlement
KW - Hydrogen evolution reaction
KW - Ion-selective electrode
KW - Oxygen reduction
KW - Palladium hydride
KW - Scanning electrochemical microscopy
UR - http://www.scopus.com/inward/record.url?scp=85168423365&partnerID=8YFLogxK
U2 - 10.1016/j.jelechem.2023.117690
DO - 10.1016/j.jelechem.2023.117690
M3 - Article
AN - SCOPUS:85168423365
SN - 1572-6657
VL - 946
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
M1 - 117690
ER -