Carbon‐wrapped Bimetallic Co/Ni Catalysts (C@Co_xNi_1−x) Derived from Co/Ni‐MOF for Bifunctional Catalysts in Rechargeable Zn‐Air Batteries

Abstract

Carbon‐wrapped Co/Ni metal nanoparticles (C@Co xNi1−x) were synthesized by calcination of bimetallic metal–organic frameworks (Co/Ni‐MOFs), prepared by a hydrothermal reaction, under N2 atmosphere and explored as bifunctional catalysts for oxygen reduction reactions (ORR) and oxygen evolution reactions (OER) for rechargeable Zn‐air batteries. Linear sweep voltammetry (LSV) measurements indicated that the composite obtained at 600°C (N600) exhibited superior electrochemical performance to other composites obtained at 500, 700, 800, and 900°C, respectively. Also N600 exhibited stable current–voltage profiles in a cycling test conducted in 8 M KOH solution for 200 h, suggesting that N600 can be a potential catalyst for rechargeable Zn‐air batteries.

Nickel‐Based Materials for Advanced Rechargeable Batteries

“…Furthermore, bimetallic Ni–Co and Fe–Ni alloys have recently been reported to exhibit enhanced electrocatalytic performance owing to the increase of metallic complexity that may increase the active sites. Besides, these alloys have been integrated with carbon materials, [ 322,323,330,331 ] which can be simultaneously equipped with two types of high‐performance active sites: The Ni/M‐N‐C structure for the ORR and Ni–M alloy particles for the OER. Zhang et al.…”

Metal–Organic Frameworks-Derived FeS–Co9S8/NCA Porous Aerogel Electrocatalyst as a High-Performance Cathode for Zinc–Air Batteries

“…51 Moreover, Figure S10b implies the Tafel slope of FeS−Co 9 S 8 /NCA-24 is measured to be 65 mV dec −1 , which is exceedingly lower than that of FeS−Co 9 S 8 /NCA-12 (205 mV dec −1 ) and FeS−Co 9 S 8 /NCA-36 (89 mV dec −1 ), also indicating the growth time of 24 h exhibits optimum OER kinetics. As revealed in the electrochemical impedance spectroscopy (EIS) in Figure S10c, the FeS−Co 9 S 8 /NCA-24 has the smallest R ct , suggesting FeS−Co 9 S 8 /NCA-24 has the best mass diffusion rate and electron transfer rate, 52 which can better modify the defects in OER kinetics and improve the performance of the catalyst. Hence, the conclusion can be drawn that 24 h is the most applicable time of fabrication for the FeS−Co 9 S 8 /NCA composite.…”

Rational Design of Metal–Organic Framework‐Based Materials for Advanced LiS Batteries

“…[21][22][23] Moreover, MOFs are utilized as a sacrificial-template for a wide range of nano-and microstructures with compositional and structural divergence. [24][25][26][27][28][29] The versatility of MOF-based materials, as reflected by MOFs, MOF-derived hybrids (MDHs), MOF-derived carbons (MDCs), enables MOF-based materials to serve a design platform for fabricating cathodes and separators with desirable properties that address the aforementioned issues of Li S batteries. 30,31 Here, we provide a new insights into the design of MOF-based materials for Li S batteries by categorizing the literature with respect to material function, rather than by material synthesis or cell components as done in several other reviews.…”