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Article Abstract
The spin configuration of electrons is inherently linked to catalytic activity, particularly in the oxygen reduction reaction (ORR). Since the regulation of electron distribution in the orbital of a metal center affects the spin state greatly, the adsorption behavior of active sites is influenced by intermediates. Herein, a straightforward adsorption-pyrolysis strategy was employed to co-anchor Co and S atoms onto amorphous carbon (CoNS, = 1, 2, 3). As a result, the presence of S enhances the Co spin state (t2g4eg2). In the high-spin state, the electron back-donation effect of Co becomes more pronounced. As this effect strengthens the Co and O orbital coupling (), it facilitates the conversion of the ligand of O to *OOH and remarkably improves the reaction kinetics. Consequently, the case of CoNS has demonstrated superior catalytic performance ( = 0.88 V), surpassing noble metal catalysts and most recently reported Co-based catalysts.
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