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Effects of phosphate precursors on morphology and oxygen evolution reaction activity of NiFe (oxy)hydroxide on nickel foams

Transactions of Nonferrous Metals Society of China, ISSN: 1003-6326, Vol: 32, Issue: 12, Page: 4050-4061
2022
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NiFe (oxy)hydroxides nanosheets were synthesized on nickel foams via co-precipitation and electrochemical activation. It is found that the phosphate precursors (Na 3 PO 4, Na 2 HPO 4 and NaH 2 PO 4 ) have diverse effects on the morphology and thus the oxygen evolution reaction activity of the formed final catalysts. The resulting NiFe (oxy)hydroxides nanosheets prepared with Na 2 HPO 4 demonstrate a low overpotential of 205 mV to achieve a current density of 50 mA/cm 2 with a Tafel slope down to 30 mV/dec in 1 mol/L KOH, and remain stable for 20 h during stability test.

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