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Reconstruction of CoNx/NC catalyst during OER by Fe3+ modulation for enhanced activity and stability

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The surface reconstruction of transition metal-based catalysts has been demonstrated to be beneficial for oxygen evolution reaction (OER). However, regulating the activity and stability of the components derived from reconstruction is challenging. Here, a strategy of Fe3+ ion modulating the reconstruction components of CoN0.4/NC electrocatalyst for promoted OER activity and stability is reported. During the OER process, the cobalt nitride components on the surface of CoN0.4/NC catalyst were converted into CoOOH and Co4+ species. And the addition of Fe3+ stabilized the CoOOH phase and facilitated the formation of Fe-CoOOH active phase, enhancing the activity and stability of CoN0.4/NC. The Fe10-CoN0.4/NC catalyst achieved a current density of 10 mA/cm2 at a low overpotential of 300 mV (vs RHE) with a Tafel slope of 68.12mV/dec. The overpotential of Fe10-CoN0.4/NC was 122 mV lower than that of the CoN0.4/NC catalyst and was comparable to commercial RuO2 catalyst. This study develops a novel technology for regulating the production of reconstructed species using Fe3+ ions.

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