Sphere-Shaped Bimetallic Sulphoselenide: An Efficient Electrocatalyst for Hydrogen Evolution Reaction

Abstract

Bimetallic chalcogenides Fe2PdSe2 (diselenide) as well as Fe2PdSSe (sulphoselenide) were prepared and characterized by different techniques, such as X-ray diffraction (XRD), high-resoltuion scanning electron microscopy (HR-SEM), high-resolution transmission electron microscopy (HR-TEM), and selected area electron diffraction (SAED). The Fe2PdSSe has a sphere shape, as confirmed by HR-SEM and HR-TEM. The efficacy of both chalcogenides as a catalyst toward hydrogen evolution reaction (HER) in an acidic environment was measured using different techniques, and Fe2PdSSe was found to be the better electrocatalyst as compared to Fe2PdSe2. The Fe2PdSSe displays overpotential of 104.2 mV vs RHE for 10 mA cm–2 current density and Tafel slope of 82.42 mV decade–1. The remarkable electrocatalytic performance of Fe2PdSSe toward HER was found because of its sphere-shaped surface morphology that generates a greater number of active sites, higher Brunauer–Emmett–Teller surface area, large electrochemically active surface area, small charge-transfer resistance, and large double-layer capacitance. We can conclude that the presence of both S and Se in sulphoselenide (Fe2PdSSe) is also responsible for the enhanced electrocatalytic activity.

Review and Perspective on Transition Metal Electrocatalysts Toward Carbon-Neutral Energy

“…In acidic electrolyte, the cathodic reaction is as follows: 2 normalH false( aq false) + + 2 normale − → normalH 2 ( g ) And in basic electrolyte: 2 normalH 2 normalO + 2 normale − → normalH 2 ( g ) + 2 normalO normalH false( aq false) − In both acidic and basic electrolytes, the HER process generally proceeds through one of two mechanisms to evolve molecular H 2 , the Volmer–Heyrovsky or the Volmer–Tafel. These mechanisms are defined by their respective reaction steps detailed below (M = metal site). The Volmer reaction which involves the electrochemical adsorption of hydrogen on the catalyst surface. normalM + normalH + + normale − → normalM normalH * .25em ( acidic electrolyte ) normalM + normalH 2 normalO + normale − → normalM normalH * + normalO normalH − .25em ( basic electrolyte ) Th...…”

“…In acidic electrolyte, the cathodic reaction is as follows: And in basic electrolyte: In both acidic and basic electrolytes, the HER process generally proceeds through one of two mechanisms to evolve molecular H 2 , the Volmer–Heyrovsky or the Volmer–Tafel. These mechanisms are defined by their respective reaction steps detailed below (M = metal site). The Volmer reaction which involves the electrochemical adsorption of hydrogen on the catalyst surface. The Heyrovsky reaction which involves the electrochemical desorption of H 2 through reaction between an adsorbed hydrogen atom and a H + in electrolyte. The Tafel reaction which involves the chemical desorption of H 2 through reaction between two neighboring adsorbed hydrogen atoms. …”

MXene-Based Nanomaterials for Multifunctional Applications

“…Furthermore, OER has attracted increasing attention in the past few years because of its key role in rechargeable metal-air batteries. As illustrated by Equations (6) and (7), the HER reaction proceeds through the reduction of protons or water molecules to a hydrogen gas [ 57 ]. The standard reduction potential of the HER is defined as 0 V relative to a standard hydrogen electrode at pH 5.…”

CrS2-Modulated Enhanced Catalytic Properties of CdS/MoS2 Heterostructures Toward Photodegradation and Electrochemical OER Kinetics

“…Metal chalcogenide nanostructures have piqued researchers’ attention in a variety of fields, including electrochemistry, physics, and material sciences . Binary chalcogenides, specially, MoS 2 , CdS, and CrS 2 , are trending for photocatalysis, electrocatalysts, biosensors, memory, capacitors, and other electronic devices due to their tunable band gap, durability, low cost, thermal stability, and outstanding electrical and optical properties.…”