Abstract
Self-supporting electrodes usually show excellent electrocatalytic performance which does not require coating steps, additional polymer binders, and conductive additives. Rapid in situ growth of highly active ingredient on self-supporting electric conductors is identified as a straight forward path to prepare binder-free and integrated electrodes. Here, Pd-doped Co3O4 loaded on carbon nanofiber materials through electrospinning and heat treatment was efficiently synthesized, and used as a free-standing electrode. Benefiting from its abundant active sites, high surface area and effective ionic conduction capability from three-dimensional (3D) nanofiber framework, Pd-Co3O4@CNF works as bifunctional oxygen electrode and exhibits superior activity and stability superior to commercial catalysts.
Highlights
To date, a wide range of electrochemistry technologies have received extensive attention in both academia and industry
Pd-Co3O4@CNF self-supporting electrode was successful prepared by electrospinning method and subsequent thermal treatment
Stimulated by the promising bifunctional activity, the zinc-air battery (ZAB) with Pd-Co3O4@CNF electrode exhibit superior chargedischarge capacity and stability compared with the commercial catalysts based ZABs
Summary
A wide range of electrochemistry technologies have received extensive attention in both academia and industry. Recent studies demonstrate that self-supporting electrodes show excellent electrocatalytic performance which do not require coating steps, additional polymer binders, and conductive additives (Tong et al, 2018; Zhang et al, 2018; Huang et al, 2020a) Flexible carriers such as metal foam or other carbon based fluid collection are commonly used to obtain electrodes with mechanical strength (Nie et al, 2018; Li et al, 2021; Yang et al, 2021b). Considering the simplicity and efficiency of electrospinning to prepare nanofibers, combined with the heat treatment process, we have achieved the preparation of the Pd- Co3O4@CNF electrode Such electrode shows extraordinary oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance in alkaline solution, and exhibits superior zinc-air battery (ZAB) performance to commercial catalysts. LANBTS BT-2016C system was used for cycling test (20 min for each charge and discharge period)
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