Table 1 Benchmarked OER activities of a-MO_X films.

All potentials in this article are expressed versus a reversible hydrogen electrode (RHE).

Sample*	Onset η (V versus RHE)	Tafel slope (mV dec⁻¹)	η_{10 mA/cm}² (V)^†
Sample*	Onset η (V versus RHE)	Tafel slope (mV dec⁻¹)	This work	Literature
a-FeO_x	0.33	38	0.24^‡	0.40^‡ (16)
a-NiO_x	0.21	62	0.36	0.36 (15)
a-Fe₂Ni₃O_x	0.19	34	0.33	0.35^§ (15)
a-MnO_x	0.22	—	0.43^‡	0.51^‡ (16)
a-IrO_x^¶	0.10	45	0.26	0.26 (15)

*O_x is broadly defined as oxo/oxyl/hydroxo.

†Overpotential required to reach 10 mA/cm², unless otherwise indicated, without correcting for mass transport.

‡Overpotential required to reach 1 mA/cm²; this value may be affected by stability issues at this pH. A Tafel slope value is not provided due to film instability under steady-state conditions.

§Corresponds to FeNiO_x.

¶Recorded at pH 0; all other data in table recorded at pH 13.