Exploring the structural dependence of metal-free carbon electrocatalysts on zinc-based metal–organic framework types

Abstract

Metal-organic frameworks (MOFs) have widely used as precursor to derive carbon-based electrocatalysts for the oxygen reduction reaction (ORR), due to the high porosity and tunable chemical composition/structure. However, the influence...

Metal–organic framework-derived advanced oxygen electrocatalysts as air-cathodes for Zn–air batteries: recent trends and future perspectives

“…However, according to the above-mentioned reports, the catalytic mechanism behind the improvement in the oxygen electrocatalytic performance is not Reproduced with permission. 104 clearly understood. Doping carbon materials with multiple heteroatoms, one with higher electronegativity and another with lower electronegativity, provides unique electrical characteristics to the carbon matrix that are beneficial for oxygen electrocatalysis.…”

“…103,104 Interestingly, all the MOFderived carbon catalysts showed superior ORR activity and durability compared to the state-of-the-art catalyst owing to the synergistic effects of their unique morphology/porous structures and the presence of N-doped heteroatoms. 104 However, N3OC derived from the Zn 3 BDT 3 MOF possessed remarkable ORR activity (E onset : 0.996 V, E 1/2 : 0.875 V, and J L : 5.50 mA cm À2 ), and consequently the N3OC-based liquid ZAB provided an OCV of 1.63 V, which is very close to the theoretical value and also highest PPD of 143.21 mW cm À2 (Fig. 7g).…”

“…102 Copyright 2018, Elsevier. (f) Schematic for the synthesis of different catalysts and (g) discharge polarization curves and the corresponding power density curves of N1OC-, N3OC-and Pt/C-assembled ZAB.Reproduced with permission 104.…”

Zn(ii)-MOF derived N-doped carbons achieve marked ORR activity in alkaline and acidic media

“…8 Zn(II)-based metal-organic frameworks (denoted as Zn-MOFs) have proven to be one ideal class of precursors toward metal-free NCs. [9][10][11][12] In this context, Zn-MOFs based on either azolate ligands (e.g. ZIF-8) or terephthalate linkages (e.g.…”