【摘 要】
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The low efficiency of oxygen evolution reaction (OER) is regarded as one of the major roadblocks for metal-air batteries and water electrolysis.Herein,a high-pe
【机 构】
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Center for Advanced M(o)ssbauer Spectroscopy, Dalian Institute of Chemical Physics, Chinese Academy
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The low efficiency of oxygen evolution reaction (OER) is regarded as one of the major roadblocks for metal-air batteries and water electrolysis.Herein,a high-performance OER catalyst of NiFeo.2 (oxy)hydroxide (NiFe0.2-OxHy) was developed through topotactic transformation of a Prussian blue analogue in an alkaline solution,which exhibits a low overpotential of only 263 mV to reach a current density of 10 mAcm-2 and a small Tafel slope of 35 mV dec-1.Ex-situ/operando Raman spectroscopy results indicated that the phase structure of NiFeo.2-OxHy was irreversibly transformed from the type of α-Ni(OH)2 to γ-NiOOH with applying an anodic potential,while ex-situ/operando 57Fe M(o)ssbauer spectroscopic studies evidenced the in-situ production of abundant high-valent iron species under OER conditions,which effectively promoted the OER catalysis.Our work elucidates that the amount of high-valent iron species in-situ produced in the NiFe (oxy)hydroxide has a positive correlation with its water oxidation reaction performance,which further deepens the understanding of the mechanism of NiFe-based electrocatalysts.
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