Electrochemical measurements were carried out using a VersaSTAT 3 electrochemistry workstation from Princeton Applied Research. The tests were performed in a standard three-electrode electrochemical cell using oxide NR-loaded CFP as the working electrode, an Ag/AgCl electrode as the reference electrode, and a Pt wire as the counter electrode in nitrogen gas saturated with 6 M KOH electrolyte. The capacitive property of CFP is provided in fig. S26. The loading amounts of CoO, Zn0.04Co0.96O, Zn0.06Co0.94O, and P-Zn0.04Co0.96O NRs on the CFP substrate were 0.322, 0.326, 0.356, and 0.335 mg cm−2, respectively. In the symmetric device testing, one ZnxCo1−xO NR electrode acted as the working electrode, and the other served as the counter electrode. The total loading mass of ZnxCo1−xO NRs on these two electrodes was 0.652 mg cm−2.

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