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Polarization curves of Ni3(HITP)2 under N2 (green) versus O2 atmosphere (red) as well as of the blank glassy carbon electrode under N2 versus O2 atmosphere (blue and purple, respectively). Scan rate=5 mV s−1, rotation rate=2,000 r.p.m., electrolyte=0.10 M aqueous KOH, counter electrode=Pt mesh, reference electrode=Hg/HgO (1.00 M KOH), working electrode=glassy carbon electrode (GCE).
