Ni K-edge XANES and EXAFS measurements performed at the Australian Synchrotron

This dataset contains Ni K-edge XANES and EXAFS measurements performed at the Australian Synchrotron. The materials tested were provided by a commercial client from China and analyzed as a paid service. Two samples were studied: CeNiOOH Substrate loading: 10 mg cm⁻². Electrolyte: 1 M KOH. ICP composition: Ni ≈ 28 at%, Ce ≈ 1.8 at%. Testing sequence: CV from 0–0.65 V vs. Ag/AgCl at 50 mV s⁻¹. Chronoamperometry at different potentials: ocp 1.35 V vs. RHE 1.4 V vs. RHE (0.3724 V vs. Ag/AgCl) – first point. 1.5 V vs. RHE (0.4742 V vs. Ag/AgCl) – second point. 1.6 V vs. RHE (0.5742 V vs. Ag/AgCl) – third point. MnNiOOH Substrate loading: 10 mg cm⁻². Electrolyte: 1 M KOH. ICP composition: Ni ≈ 28 at%, Mn ≈ 1.9 at%. Testing sequence: CV from 0–0.65 V vs. Ag/AgCl at 50 mV s⁻¹. Chronoamperometry at different potentials: ocp 1.35 V vs. RHE 1.4 V vs. RHE (0.3242 V vs. Ag/AgCl) – first point. 1.5 V vs. RHE (0.4742 V vs. Ag/AgCl) – second point. 1.6 V vs. RHE (0.5742 V vs. Ag/AgCl) – third point. Expected Results For CeNiOOH, Ni valence states are expected to remain largely unchanged during OER potential increase, with minimal variation in coordination number. For MnNiOOH, Ni valence changes may be slightly larger than in CeNiOOH, but still relatively minor, with somewhat greater reduction in coordination number compared to CeNiOOH. Copyright Notice This dataset was measured at the Australian Synchrotron. The materials were supplied by a commercial client from China and analyzed as part of a paid testing service. Until payment is received in full, the copyright for this dataset belongs solely to Kai Dong. No part of this dataset may be used by any individual or organization without explicit permission. Unauthorized use will give Kai Dong the right to request retraction of any related publications. Any future updates will be included in this dataset. Date of issue: 14 August 2025.