Co₉S₈ Nanoparticles‐Embedded N/S‐Codoped Carbon Nanofibers Derived from Metal–Organic Framework‐Wrapped CdS Nanowires for Efficient Oxygen Evolution Reaction

Abstract

Metal-organic frameworks (MOFs) with tunable compositions and morphologies are recognized as efficient self-sacrificial templates to achieve function-oriented nanostructured materials. Moreover, it is urgently needed to develop highly efficient noble metal-free oxygen evolution reaction (OER) electrocatalysts to accelerate the development of overall water splitting green energy conversion systems. Herein, a facile and cost-efficient strategy to synthesize Co S nanoparticles-embedded N/S-codoped carbon nanofibers (Co S /NSCNFs) as highly active OER catalyst is developed. The hybrid precursor of core-shell ZIF-wrapped CdS nanowires is first prepared and then leads to the formation of uniformly dispersed Co S /N, S-codoped carbon nanocomposites through a one-step calcination reaction. The optimal Co S /NSCNFs-850 is demonstrated to possess excellent electrocatalytic performance for OER in 1.0 m KOH solution, affording a low overpotential of 302 mV to reach the current density of 10 mA cm , a small Tafel slope of 54 mV dec , and superior long-term stability for 1000 cyclic voltammetry cycles. The favorable results raise a concept of exploring more MOF-based nanohybrids as precursors to induce the synthesis of novel porous nanomaterials as non-noble-metal electrocatalysts for sustainable energy conversion.

Double Morphology of Co9S8 Coated by N, S Co-doped Carbon as Efficient Anode Materials for Sodium-Ion Batteries

“…Furthermore, the S 2p spectrum (Fig. 2d) is fitting into four peaks, consisting of 162.45 eV (S-Co), 163.7 eV (S-C), 165 eV (S-C), and 168.2 eV (sulfate) [47]. And N 1s spectra (Additional file 1: Figure S2) contain three peaks at 398.4 eV, 400.1 eV, and 401.0 eV, which correspond to pyridinic N, pyrrolic N, and graphitic N, respectively [48].…”

Metallic Co9S8 Coupled Hollow N‐Doped Carbon Sphere with Synergistic Interface Structure for Efficient Electricity Generation in Microbial Fuel Cells

“…The Brunauer‐Emmett‐Teller (BET) specific surface area and pore size distribution of Co 9 S 8 /NHCS were investigated using N 2 adsorption‐desorption isotherm. Figure c shows a mode of type‐IV N 2 adsorption‐desorption isotherm with evident hysteresis loops at a relative pressure between 0.60 and 1.0, suggesting the presence of mesopores in Co 9 S 8 /NHCS (Figure d) . The BET surface area of Co 9 S 8 /NHCS was 346.9 m 2 g −1 and the average pore diameter was calculated to 8.22 nm.…”

A Facile Synthesis of FeCo Nanoparticles Encapsulated in Hierarchical N‐Doped Carbon Nanotube/Nanofiber Hybrids for Overall Water Splitting

“…[34] A type-IV adsorption-desorption isotherms of all the samples, shown in Figure 2h, are typically known for mesoporous structures. [36] A H4 hysteresis, observed in multilayer region of the adsorption-desorption isotherm due to capillary condensation of adsorbate was attributed to the presence of slit-type pores. [37] The pore size distribution, in the Figure 2i, was estimated by the Non-local Density Functional Theory (NLDFT) model and shows that all samples have highly ordered mesopores with diameter of~3.8 nm.…”

“…In addition, a high surface area is desired for an efficient electrocatalyst to facilitate the charge transfer between the catalyst, reactant and the electrolyte interface . A type‐IV adsorption‐desorption isotherms of all the samples, shown in Figure h, are typically known for mesoporous structures . A H4 hysteresis, observed in multilayer region of the adsorption‐desorption isotherm due to capillary condensation of adsorbate was attributed to the presence of slit‐type pores .…”