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The d-band center is a promising descriptor to understand trends in electrocatalysis extensively studied in transition metal oxides but largely unexplored in metal organic frameworks (MOFs). Herein, we present our systematic study aimed at developing a mini-volcano plot demonstrating dependence of bifunctional oxygen electrocatalytic activity of Prussian blue analogues (PBAs) on their d-band center. Our results from ex-situ core level and valence band XPS, Raman, and FTIR spectroscopy suggest that the tuning of the d-band center via modulated N and C-coordinated metal centers dictates their electrocatalytic OER and ORR activities. Among PBAs, the CoCo PBA exhibits highest activity due to its optimal position of d-band center and abundant Co
Jain et al. (Fri,) studied this question.