Facile NiCo2S4/C nanocomposite: an efficient material for water oxidation

Abstract

The water oxidation in alkaline media is a kinetically sluggish process and it requires an active electrocatalyst for overall water splitting which is a challenging task to date. Herein, we formulate a platform for the design of efficient NiCo 2 S 4 /C nanocomposite using earth abundant and nonprecious materials. The nanocomposites are prepared by scale up hydrothermal method using different carbon contents from acid dehydrated sucrose. They are structurally and morphologically characterized by various analytic techniques. The scanning electron microscopy has shown few microns flower-like morphology of nanocomposite and hexagonal crystalline phase is identified by X-ray diffraction (XRD). Further, high-resolution transmission electron microscopy supported the XRD results, and C, Ni, Co and O elements were found in the composition nanocomposite as investigated by energy-dispersive spectroscopy. The most active nanocomposite reaches a current density of 20 mA•cm −2 at potential of 285 mV vs reversible hydrogen electrode. The nanocomposite is kinetically supported by 61 mV•dec −1 as small Tafel slope. The nanocomposite is stable and durable for 40 h. The electrochemical impedance spectroscopy described a small charge transfer resistance of 188.4 Ω. These findings suggest that the NiCo 2 S 4 /C nanocomposite could be used as a promising material for an extended range of applications particularly in energy technology.

High valence state metal-ion doped Fe–Ni layered double hydroxides for oxygen evolution electrocatalysts and asymmetric supercapacitors

“…S12e and f, ESI †), which is related to the oxidation of M(OH) 2 to MOOH. 19 The related OER mechanism in an alkaline environment is generally described by the following steps: 20,21 FeNiCo + OH À -FeNiCoOH + e À FeNiCoOH + OH À -FeNiCoO + H 2 O + e À FeNiCoO + OH À -FeNiCoOOH + e À FeNiCoOOH + OH À -FeNiCoO + O 2 + H 2 O + e-''FeCoNi'' represents the metal active site. Metals as the active sites have the electronic gains and losses, and they are partially oxidized after the OER process, which are consistent with the above characterization.…”

Anchoring stable FeS2 nanoparticles on MXene nanosheets via interface engineering for efficient water splitting

“…26,27 Many efforts have been made to improve the bifunctional catalytic performance of TMS. [28][29][30] Interface engineering is the most effective way to improve the electrocatalytic activity of TMS towards water splitting. 26,31 Moreover, most non-precious metal catalysts cannot reach the benchmark of Ir/Ru-based catalysts owing to their poor conductivity, which could be solved by hybridizing them with conductive additives.…”

The Spin Modulation Stimulated Efficient Electrocatalytic Oxygen Evolution Reaction over LaCoO3 Perovskite

“…This is because that the electronic configuration transition would optimize the e g orbital occupation of transition-metal ions. [24][25][26][27][28][29][30][31][32][33] Based on the above consideration, herein, we proposed a spin state modulation strategy to improve the electrocatalytic activity of LaCoO 3 (LCO). Firstly, the LCO catalyst was fabricated by a simple solgel method, and then high temperature thermal reduction treatment was adopted to regulate the electronic configuration.…”