Mo-Doped Zn, Co Zeolitic Imidazolate Framework-Derived Co₉S₈ Quantum Dots and MoS₂ Embedded in Three-Dimensional Nitrogen-Doped Carbon Nanoflake Arrays as an Efficient Trifunctional Electrocatalysts for the Oxygen Reduction Reaction, Oxygen Evolution Reaction, and Hydrogen Evolution Reaction

Abstract

Herein, we first propose a facile strategy to synthesize Co9S8 and MoS2 nanocrystals embedded in porous carbon nanoflake arrays supported on carbon nanofibers (Co9S8-MoS2/N-CNAs@CNFs) by the pyrolysis of Mo-doped Zn, Co zeolitic imidazolate framework grown on carbon nanofibers and subsequent sulfuration. The electrocatalyst shows high and stable electrocatalytic performance, with a half-wave potential of 0.82 V for oxygen reduction reaction and an overpotential at 10 mA cm–2 for oxygen evolution reaction (0.34 V) and hydrogen evolution reaction (0.163 V), which outperform the metal–organic framework-derived transition metal sulfide catalysts reported so far. Furthermore, the Co9S8-MoS2@N-CNAs@CNFs are employed as an air cathode in a liquid-state and all-solid-state zinc-air battery, presenting high power densities of 222 and 96 mW cm–2, respectively. Such excellent catalytic activities are mainly owing to the unique three-dimensional structure and chemical compositions, optimal electronic conductivity, adequate surface area, and the abundance of active sites. Thus, this work provides an important method for designing other metal–organic framework-derived three-dimensional structural sulfide quantum dot multifunctional electrocatalysts for wider application in highly efficient catalysis and energy storage.

Multifunctionality Exploration of Ca2FeRuO6: An Efficient Trifunctional Electrocatalyst toward OER/ORR/HER and Photocatalyst for Water Splitting

“…Although detailed mechanistic pathways for these reactions are still unclear, researchers interrelate their results on the basis of defects, synergistic interaction, and the electronic structure of catalysts. To date, very few tri- and multifunctional catalytic systems have been reported − (Table ), but the bulk-phase double perovskites have rarely been investigated as trifunctional electrocatalysts as well as photocatalysts. Selected Bi-based double-perovskite oxides or halides have been recognized as (photo-) electrocatalysts, while the existing double perovskites are effective only for specific applications such as CO 2 and N 2 reduction and advance oxidation processes (AOPs) but not as multifunctional catalysts .…”

Recent Advances on Electrospun Nanomaterials for Zinc–Air Batteries

“…[ 90 ] The metal‐organic framework (MOF) materials can be used as another ideal precursors to prepare the air catalysts with abundant M–N–C active sites. [ 91–97 ] For example, the ZIF‐67 derived Co/N–C particles on the PAN‐based carbon nanofibers (C‐PAN@ZIF‐67) with gems‐on‐string structure and more Co–N–C active sites exposure, which exhibit a long‐term stability of 965 h ( j = 10 mA cm −2 , 10 min per cycle) (Figure 8d). [ 98 ] Similarly, bimetallic Zn/Co–ZIF was used to synthesize the CNF@Zn/CoNC.…”

Air Electrodes for Flexible and Rechargeable Zn−Air Batteries

“…The obtained film was composed of uniformly interconnected microfibers, with interfiber pores being beneficial for transporting electrolytes and reactants. [ 151 ] Except for single‐atomic Co‐active sites, [ 216 ] metal NPs [ 217–219 ] , metal oxide, [ 220–223 ] sulfide, [ 224 ] nitride, [ 38,122 ] or other metal compounds [ 115,225 ] with carbon nanosheets arrays were also developed. Figure 11e shows the schematic illustration of P‐doped CoSe 2 hollow nanoclusters embedded in mesoporous NC hierarchical FAs (P‐CoSe 2 /N‐C FAs), which grew on CC substrates.…”