TY - JOUR
T1 - Sulfide interlayered cobalt-based oxynitrides for efficient oxygen evolution reaction in neutral pH water and seawater
AU - Badreldin, Ahmed
AU - Abed, Jehad
AU - Hassan, Noor
AU - El-Ghenymy, Abdellatif
AU - Suwaileh, Wafa
AU - Wubulikasimu, Yiming
AU - Ghouri, Zafar Khan
AU - Youssef, Karim
AU - Kumar, Dharmesh
AU - Elsaid, Khaled
AU - Sargent, Edward H.
AU - Abdel-Wahab, Ahmed
N1 - Publisher Copyright:
© 2023 The Authors
PY - 2023/8/5
Y1 - 2023/8/5
N2 - Sluggish kinetics of the anodic oxygen evolution reaction (OER) and minor upstream upsets in feed water quality remain bottlenecks for efficient water electrolysis, which is exacerbated under near-neutral pH environments due to H2O dissociation. In this work, we report the introduction of a NiSx interlayer in a Co-(NiFe) oxide/nitride catalyst on nickel foam substrate. Postmortem OER characterization in neutral pH synthetic seawater (SSW) shows that stable cationic [Co-(NiFe)]δ+ and anionic [O-N]δ– surface species coupled with the NiSx interlayer accelerate H2O dissociation, thereby enhancing activity and kinetics. The electrocatalysts exhibit stable performance at 100 mA cm−2 for 50 h in alkaline and neutral pH SSW with 350 and 425 mV of overpotential, respectively. The faradaic efficiency of the NiSx interlayer catalysts is enhanced by 10.3% and 8.5% achieving 94.5% and 87.4% under alkaline and neutral pH SSW, respectively, during chronoamperometry tests at a high applied voltage of 1.75 V (vs. RHE).
AB - Sluggish kinetics of the anodic oxygen evolution reaction (OER) and minor upstream upsets in feed water quality remain bottlenecks for efficient water electrolysis, which is exacerbated under near-neutral pH environments due to H2O dissociation. In this work, we report the introduction of a NiSx interlayer in a Co-(NiFe) oxide/nitride catalyst on nickel foam substrate. Postmortem OER characterization in neutral pH synthetic seawater (SSW) shows that stable cationic [Co-(NiFe)]δ+ and anionic [O-N]δ– surface species coupled with the NiSx interlayer accelerate H2O dissociation, thereby enhancing activity and kinetics. The electrocatalysts exhibit stable performance at 100 mA cm−2 for 50 h in alkaline and neutral pH SSW with 350 and 425 mV of overpotential, respectively. The faradaic efficiency of the NiSx interlayer catalysts is enhanced by 10.3% and 8.5% achieving 94.5% and 87.4% under alkaline and neutral pH SSW, respectively, during chronoamperometry tests at a high applied voltage of 1.75 V (vs. RHE).
KW - Electrochemical water oxidation
KW - Impure water electrolysis
KW - Neutral pH water electrolysis
KW - Oxygen evolution reaction
KW - Seawater electrolysis
UR - http://www.scopus.com/inward/record.url?scp=85149856304&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2023.122599
DO - 10.1016/j.apcatb.2023.122599
M3 - Article
AN - SCOPUS:85149856304
SN - 0926-3373
VL - 330
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 122599
ER -