Spectroscopy — Composition-dependent electrocatalytic activities of NiFe-based selenides for the oxygen evolution reaction

4 measurement groups · 20 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

NiFe-PBA · Powder

FT-IR spectrum of NiFe-PBA; source figure is in rendered SI but peak assignments are quoted in main text.

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CN group band	~2113 cm-1	—	—	Text Approximate	p003 · Results and discussion · Fig. S1 (SI cited)
CN group band	~2158 cm-1	—	—	Text Approximate	p003 · Results and discussion · Fig. S1 (SI cited)
crystal water band	~1611 cm-1	—	—	Text Approximate	p003 · Results and discussion · Fig. S1 (SI cited)
crystal water stretch	~3408 cm-1	—	—	Text Approximate	p003 · Results and discussion · Fig. S1 (SI cited)

Ni-Fe-Se1:1-180 · Powder

Stability-test structural and surface analysis; supporting plots in missing Figs. S11-S12.

Context: post-OER catalyst
Measurement source: S-8/S-9 · Results and discussion · Fig. S11/S12 (SI cited)

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Post-OER surface state	surface oxidation to metal selenide/(oxy)hydroxide core-shell; bulk XRD almost unchanged	—	—	Text Qualitative	p006 · Results and discussion · Fig. S11/S12 (SI cited)

Ni-Fe-Se1:1-180 · Powder

Survey and high-resolution Ni 2p, Fe 2p and Se 3d spectra.

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Fe 2p Fe2+ peak	708 eV; Fe2+	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4
Fe 2p Fe2+ peak	720 eV; Fe2+	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4
Fe 2p Fe3+ peak	712.2 eV; Fe3+	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4
Fe 2p Fe3+ peak	725.5 eV; Fe3+	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4
Fe3+ relative abundance	Fe3+ fitting peak area higher than Fe2+	—	—	Text Qualitative	p004 · Results and discussion · Fig. 4c
Ni 2p Ni2+ peak	854.5 eV; Ni2+ in selenides	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4
Ni 2p Ni2+ peak	872.3 eV; Ni2+ in selenides	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4
Ni 2p oxidized Ni peak	856.8 eV; oxidized Ni species	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4
Ni 2p oxidized Ni peak	874.8 eV; oxidized Ni species	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4
Se 3d metal-selenium peak	54.9 eV; metal-selenium bonds	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4
Se 3d metal-selenium peak	55.7 eV; metal-selenium bonds	—	—	Text Exact Reported	p004 · Results and discussion · Fig. 4

Ni-Fe-Se1:1-180 · Powder

Elemental ratio of Ni-Fe-Se1:1-180; source Fig. S4 is in rendered SI but values are quoted in main text.

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Total mass percentage of Ni, Fe and Se	89.8 wt%	—	—	Text Exact Reported	S-5 · Supporting Information, Figure S6 paragraph · Figure S6
XRF atomic ratio Fe	20.91	—	—	Text Exact Reported	p004 · Results and discussion · Fig. S4 (SI cited)
XRF atomic ratio Ni	31.51	—	—	Text Exact Reported	p004 · Results and discussion · Fig. S4 (SI cited)
XRF atomic ratio Se	73.79	—	—	Text Exact Reported	p004 · Results and discussion · Fig. S4 (SI cited)