Preparation of Ni3Fe2@NC/CC Integrated Electrode and Its Application in Zinc-Air Battery

Abstract

Reasonable design and development of a low-cost and high-efficiency bifunctional electrocatalyst for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is essential for promoting the development of Zinc-air battery technology. Herein, we obtained an integrated catalytic electrode, NiFe nanoparticles supported on nitrogen-doped carbon (NC) directly grown on the carbon cloth (designated as Ni 3 Fe 2 @NC/CC), by pyrolysis of bimetallic NiFe metal-organic framework (MOF) precursor. There is a synergistic effect between nickel and iron component, which enhances the bifunctional catalytic activity. In addition, the underlying carbon cloth is conducive to the efficient electron transfer and also benefits the uniform loading of catalytically active materials. Thus, the integrated electrode shows good OER/ORR dual-functional catalytic performance, and the OER overpotential is much lower than that of the traditional drop-coating electrode and precious metal catalyst (IrO 2 ). Moreover, the Ni 3 Fe 2 @NC/CC integrated electrode used in zinc-air batteries shows good flexibility and cycle stability. Our findings provide a new avenue for the development of efficient and stable bifunctional oxygen electrocatalysts.

Control of Calcium Phosphate Nucleation and Transformation through Interactions of Enamelin and Amelogenin Exhibits the “Goldilocks Effect”

“…For example, enamelin, a large glycoprotein (Mw = 186 kDa), constitutes <5% of the extracellular matrix but is required for enamel mineral formation, as shown unequivocally in gene-targeted mouse models and human mutations resulting in hypoplastic AI. [24][25][26][27][28] No true enamel or apatite mineral ribbons are formed in Enam −/− mice. 29 The abnormally thin and disorganized enamel in AI patients suggests that enamelin is required to drive crystal formation, achieve structural organization of the apatite prisms, and develop optimal enamel thickness.…”

“…[24][25][26][27][28] No true enamel or apatite mineral ribbons are formed in Enam −/− mice. 29 The abnormally thin and disorganized enamel in AI patients suggests that enamelin is required to drive crystal formation, achieve structural organization of the apatite prisms, and develop optimal enamel thickness. 26,27 Despite its critical function in normal enamel formation, the mechanistic role of enamelin in the development of the mineral is not yet understood.…”

FeNi Nanoparticles Coated on N‐doped Ultrathin Graphene‐like Nanosheets as Stable Bifunctional Catalyst for Zn‐Air Batteries

“…The electrochemically active surface area (ECSA) of electrocatalyst is known to be linearly proportional to the electrochemical double‐layer capacitance (C dl ). The C dl value of 12.2 mF cm −2 for FeNi/N−C‐900 shown in Figure 4S is much larger than those of catalysts in literature [40,41] . The high C dl indicates the benefits of FeNi nanoparticles and N−C substrate in exposing more electrochemical active sites, which is greatly relevant with the large BET surface area, abundant porous nanostructures, and ultrathin graphene‐like morphology.…”

“…The discharge potential plateau of FeNi/N−C‐900 is 1.23 V, which is slightly lower than lower than that of Pt/C−RuO 2 in Figure 8e. However, the specific discharge capacity of FeNi/N−C‐900 as cathode catalyst is 816.1 mAh g −1 , which is significantly higher than 712.1 mAh g −1 of Pt/C−RuO 2 and higher than the same type of cathode catalyst shown in Table S2 [41,44,45] . Finally, the cycle stability of Zn‐air battery is characterized by the cycle numbers of galvanostatic charge‐discharge, as shown in Figure 8f.…”

In Situ Grown CoMn2O4 3D‐Tetragons on Carbon Cloth: Flexible Electrodes for Efficient Rechargeable Zinc–Air Battery Powered Water Splitting Systems

“…[23][24][25][26][27][28] Further, recent reports have indicated that the decoration of electrocatalysts directly on carbon cloth (CC) is a feasible method for improving their long-term electrocatalytic activities. [29][30][31][32][33][34][35][36][37][38][39] Moreover, this decoration can prevent the aggregation and leaching of the powder electrocatalyst from its substrate in liquid electrolytes during reactions, thus enhancing the electronic coupling between the electrocatalyst and substrate. Although there are many methods for synthesizing CoMn 2 O 4 for ECS applications, [19,20,[40][41][42][43][44][45][46][47][48][49][50] a few studies have attempted to specifically obtain surfactant, binder-free flexible electrodes.…”