In Situ Electrodeposition of Cobalt Sulfide Nanosheet Arrays on Carbon Cloth as a Highly Efficient Bifunctional Electrocatalyst for Oxygen Evolution and Reduction Reactions

Abstract

As one of the advanced cobalt-based materials, cobalt sulfides with novel architecture have attracted huge interest due to the low cost, easy availability, and promising bifunctional activity for both the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), which is essential for next-generation energy storage devices. Herein, we demonstrated a facile and clean electrochemical technique to directly synthesize CoS nanosheets with high purity onto the surface of carbon cloth, and a quick thermal treatment was performed to further improve the catalytic performance (CoS-A). This novel electrochemical technique avoids the use of the binder, surfactant, and other organic additives, which may cause poor electric conductivity as well as undesirable surface wettability, exhibiting great potential of the large-scale applications. The obtained CoS-A exhibits a superior electrocatalytic performance for the OER and ORR, with a high ORR current density (-1.51 mA cm at 0.2 V), considerable OER current density (148 mA cm at 1.9 V), and excellent durability in continuous measurement for over 12 h. The approach offers a powerful yet simple method to control the phase, composition, and morphology of a highly active CoS catalyst, which provides a new idea for the design of high-performance catalysts.

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

“…Studies have shown that Co/Ni based materials exhibited high electrocatalytic OER activity in alkaline solutions . These materials included cobalt (nickel) oxides/hydroxide, Co(Ni)Fe layered double hydroxides (LDHs), cobalt (nickel) molybdate, cobalt (nickel) sulfides, cobalt (nickel) selenides, cobalt (nickel) nitrides, and cobalt (nickel) phosphides . However, due to the low active surface area and the poor electrical conductivity, the performance of these electrocatalysts still does not meet the requirements for practical applications.…”

Defect Engineering of Carbon‐based Electrocatalysts for Rechargeable Zinc‐air Batteries

“…[98][99][100] Encapsulation of TM compounds including alloys, hydroxides, sulfides, phosphates and nitrides nanoparticles in N-doped carbon is also an effective method to generate materials rich in electrocatalytic active sites. [68,[101][102][103][104][105][106][107][108] The N-doped carbon effectively facilitates the electron transport and prevents the aggregation of nanoparticles. [68,101] The synergistic effect of TM compounds in contact with carbon materials can improve electron transfer capability, thus promoting catalytic efficiency and stability of ORR and OER.…”

“…[68,101] The synergistic effect of TM compounds in contact with carbon materials can improve electron transfer capability, thus promoting catalytic efficiency and stability of ORR and OER. [102][103][104][105][106][107][108] Gupta et al [15] synthesized highly active and stable graphene tubes decorated with FeCoNi alloy nanoparticles (Figure 10a). It was found that the unique structure of the graphene tube provides the maximum electrochemical accessible surface area, and together with the optimal graphitization degree and pyridinic nitrogen content significantly contributes to the activity and durability of the catalyst.…”

“…The assembly of TM compounds (e. g., oxides, alloys, hydroxides, sulfides, phosphates, nitrides, carbides, perovskites and spinels) on the heteroatoms‐doped carbon by chemical attachment and electrical coupling is another feasible way to introduce TM into carbon materials [68,88–108] . TM compounds have been widely reported as OER electrocatalysts [76,109] .…”

Heterogeneous Mo2C/Fe5C2 Nanoparticles Embedded in Nitrogen‐Doped Carbon as Efficient Electrocatalysts for the Oxygen Reduction Reaction

“…In recent years, considerable attempts have been made to develop a variety of noble‐metal‐free catalysts. For example, transition metal phosphide, chalcogenides,, oxides,, carbides,, nitrides,, transition metal nitrogen‐containing complexes , . Among these candidates, transition metal carbides (TMC), such as Mo 2 C, Fe 5 C 2 and WC, have attracted a great attention due to their Pt‐group‐metals‐like electronic configuration and catalytic properties, while significantly reducing costs .…”