title: Contributions to activity enhancement via Fe incorporation in Ni-(oxy)hydroxide/borate catalysts for near-neutral pH oxygen evolution.
abstract: Ni-borate materials are oxygen evolution catalysts that operate at near-neutral pH and have been found previously to improve due to structural changes induced via anodic conditioning. We find that this increased activity after conditioning at 0.856 V vs. SCE, as measured on a turn-over frequency basis (TOF) at 400 mV overpotential (TOF = 0.38 s(-1)), accompanies significant Fe incorporation (14%). Films conditioned in Fe-free electrolyte exhibit ∼10 times lower activity (TOF = 0.03 s(-1)). By co-depositing Fe-Ni we demonstrate high activity without conditioning (TOF = 0.24 s(-1)) which improves further with shortened (∼30 min) conditioning (TOF = 1.4 s(-1)).
authors.affiliation: Department of Chemistry and Biochemistry and the Materials Science Institute, University of Oregon, Eugene, 97403, USA. swb@uoregon.edu.
authors.forename: Adam M
authors.initials: AM
authors.lastname: Smith
authors.forename: Lena
authors.initials: L
authors.lastname: Trotochaud
authors.forename: Michaela S
authors.initials: MS
authors.lastname: Burke
authors.forename: Shannon W
authors.initials: SW
authors.lastname: Boettcher