Interfacial Effects of NiFe-Based Bifunctional Electrocatalysts for Highly Efficient Overall Water Splitting

Langmuir, Journal Year: 2024, Volume and Issue: 40(49), P. 26339 - 26349

Published: Nov. 22, 2024

The reasonable design of highly efficient NiFe-based bifunctional electrocatalysts is imperative for water splitting and alleviation the energy crisis. Herein, are designed grown in situ on Ni foam by a simple hydrothermal method. interfacial effect among NiFe-LDH, Fe

Language: Английский

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Significant Reduction of Anode Reaction Overpotential in Alkaline Water Electrolysis by Ultrathin NiFe Layered Double Hydroxide in Ethanol‐added Electrolyte

ChemCatChem, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 31, 2024

Abstract Electrochemical alkaline water electrolysis (AWE) is regarded as an effective method for producing high‐purity hydrogen without relying on platinum group metal (PGM) catalyst. However, the oxygen evolution reaction (OER), anode half‐reaction, involves a four‐electron transfer process with slow kinetics, which significantly reduces overall efficiency of AWE. Although highly efficient catalysts can accelerate OER rate, high overpotential still remains important factor hindering Herein, ultrathin NiFe‐layered double hydroxide (U‐NiFe LDH) nanosheet arrays were synthesized and used due to their robust structure, excellent flexibility, interlayer anion compensation. Only 250 mV was required reach current density 10 mA cm −2 in 1 M KOH. Incorporating additive ethanol into KOH electrolyte further AWE 114 mV. The could be decreased by 130 at 100 three‐electrode system U‐NiFe LDH anode. This work provides possible approach development low‐energy green technology electrocatalytic production.

Language: Английский

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Predictive Modeling of Molecular Mechanisms in Hydrogen Production and Storage Materials

Materials, Journal Year: 2023, Volume and Issue: 16(17), P. 6050 - 6050

Published: Sept. 3, 2023

Hydrogen has been widely considered to hold promise for solving challenges associated with the increasing demand green energy. While many chemical and biochemical processes produce molecular hydrogen as byproducts, electrochemical approaches using water electrolysis are be a predominant method clean production. We discuss current state-of-the-art in production storage and, more significantly, role of computational modeling predictively designing deriving insights enhancing efficiency future materials interest. One key takeaways this review lies continued development implementation large-scale atomistic simulations enable use designer electrolyzer-electrocatalysts operating under targeted thermophysical conditions improving advanced materials, limited tradeoffs efficiency.

Language: Английский

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Spent Zinc–Carbon Battery-Derived Carbon Nanoparticles Coupled with Transition Metal Dichalcogenides for Enhanced pH-Universal Hydrogen Evolution Reaction

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 19, 2024

Utilizing highly effective waste-into-value electrocatalysts for the hydrogen evolution reaction (HER) opens a sustainable route to economically beneficial and environmentally friendly production. A simple strategy reusing spent batteries involves enhancing HER performance by preparing of carbon anode in zinc–carbon transition metal dichalcogenide (TMDs) materials. In this study, nanoparticles (CNPs) are incorporated into basal planes MoS2 WS2 using ultrasonication method. CNPs@TMDs (CNPs@WS2 CNPs@MoS2) with fewer-layer structures enhanced exposed active sites show promising catalytic activity pH-universal HER. acid, CNPs@WS2 CNPs@MoS2 exhibit overpotentials 0.34 0.42 V at 10 mA cm–2, Tafel slopes 0.139 dec–1 0.145 dec–1, respectively. The originates from their improved electrical conductivity higher electrochemically surface area. Alongside experimental results, density function theory (DFT) calculations reveal that incorporating atoms on TMD can efficiently tune electronic properties monolayers semiconductor semimetal considerably reduces adsorption Gibbs free energies. These results indicate catalysts universal pH media fabricated via an economical facile method, holding promise practical applications paving way battery recycling.

Language: Английский

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Dual-Modification Engineering of CoNi Alloy Realizing Robust Performance for Electrocatalytic Hydrogen Production

Catalysts, Journal Year: 2023, Volume and Issue: 13(7), P. 1064 - 1064

Published: July 1, 2023

Anion modification and trace metal doping have been widely demonstrated to unique advantages in regulating both electrocatalytic activity the electronic structure of non-precious materials. Developing a simple practical preparation strategy is critical, but it still faces challenges. In this paper, novel type dual-modification approach put forward rationally design S, Pt-CoNi material, which can be grown directly on nickel foam (NF) one-step electrodeposition process. The multiple having plenty active sites, high conductivity, faster charge transfer endow optimized reaction kinetic for HER. prepared Pt-CoNi/NF catalyst displays excellent catalytic performance, low overpotential 116 mV at 50 mA cm−2 small Tafel slope 75 dec−1 are achieved. coupled Pt-CoNi/NF||FeOOH/NF electrolyzer delivers current density 100 potential 1.61 V as well superior stability under alkaline conditions. Our work experimentally confirms feasibility constructing dual-regulation via electrodeposition, also provides ideas controllable other high-performance electrodes electrocatalysis.

Language: Английский

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