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Congratulations to Meihuan Liu for her paper about synergetic dual-ion centers boosting metal organic framework alloy catalysts toward efficient two electron oxygen reduction published on Small

发布者:张秀秀发布时间:2022-06-09动态浏览次数:15

Herein, a strategy of synergetic dual-metal-ion centers to boost transition-metal-based metal organic framework (MOF) alloy nanomaterials as active oxygen reduction reaction (ORR) electrocatalysts for efficient hydrogen peroxide (H2O2) generation is proposed. Through a facile one-pot wet chemical method, a series of MOF alloys with unique Ni–M (M–Co, Cu, Zn) synergetic centers are synthesized, where the strong metallic ions 3d–3d synergy can effectively inhibit O2 cleavage on Ni sites toward a favorable two-electron ORR pathway. Impressively, the well-designed NiZn MOF alloy catalysts show an excellent H2O2 selectivity up to 90% during ORR, evidently outperforming that of NiCo MOF (45%), and NiCu MOF (55%). Moreover, it sustains efficient activity and robust stability under a continuous longterm ORR operation. The correlative in situ synchrotron radiation X-ray adsorption fine structure and Fourier transform infrared spectroscopy analyses reveal at the atomic level that, the higher Ni oxidation states species, regulated via adjacent Zn2+ ions, are favorable for optimizing the adsorption energetics of key *OOH intermediates toward fast two electron ORR kinetics.

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