Self-supported iron-doped nickel oxide multifunctional electrodes for highly efficient energy storage and overall water-splitting uses

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 86, P. 111363 - 111363

Published: March 22, 2024

Language: Английский

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Interface Engineering via Ti₃C₂T_x MXene Enabled Highly Efficient Bifunctional NiCoP Array Catalysts for Alkaline Water Splitting

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(27), P. 34798 - 34808

Published: June 26, 2024

Developing a non-noble metal-based bifunctional electrocatalyst with high efficiency and stability for overall water splitting is desirable renewable energy systems. We developed novel method to fabricate heterostructured electrocatalyst, comprising NiCoP nanoneedle array grown on Ti3C2Tx MXene-coated Ni foam (NCP-MX/NF) using dip-coating hydrothermal method, followed by phosphorization. Due the abundance of active sites, enhanced electronic kinetics, sufficient electrolyte accessibility resulting from synergistic effects NCP MXene, NCP-MX/NF alkaline catalysts afford superb electrocatalytic performance, low overpotential (72 mV at 10 mA cm–2 HER 303 50 OER), Tafel slope (49.2 dec–1 69.5 long-term stability. Moreover, performance NCP-MX/NF, which requires potentials as 1.54 1.76 V current density cm–2, respectively, exceeded Pt/C∥IrO2 couple in terms splitting. Density functional theory (DFT) calculations NCP/Ti3C2O2 interface model predicted catalytic contribution interfacial formation analyzing redistribution interface. This was also evaluated calculating adsorption energetics descriptor molecules (H2O H OER intermediates).

Language: Английский

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Electronic Structure Modulation Via Iron-Incorporated NiO to Boost Urea Oxidation/Oxygen Evolution Reaction

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(17), P. 7937 - 7945

Published: April 17, 2024

The urea-assisted water splitting not only enables a reduction in energy consumption during hydrogen production but also addresses the issue of environmental pollution caused by urea. Doping heterogeneous atoms Ni-based electrocatalysts is considered an efficient means for regulating electronic structure Ni sites catalytic processes. However, current methodologies synthesizing heteroatom-doped exhibit certain limitations, including intricate experimental procedures, prolonged reaction durations, and low product yield. Herein, Fe-doped NiO were successfully synthesized using rapid facile solution combustion method, enabling synthesis 1.1107 g within mere 5 min. incorporation iron facilitates modulation environment around atoms, generating substantial decrease Gibbs free intermediate species Fe-NiO catalyst. This modification promotes cleavage C-N bonds consequently enhances performance UOR. Benefiting from tunability active its electron transfer, needs 1.334 V to achieve 50 mA cm

Language: Английский

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Research Advances of Non-Noble Metal Catalysts for Oxygen Evolution Reaction in Acid

Materials, Journal Year: 2024, Volume and Issue: 17(7), P. 1637 - 1637

Published: April 3, 2024

Water splitting is an important way to obtain hydrogen applied in clean energy, which mainly consists of two half-reactions: evolution reaction (HER) and oxygen (OER). However, the kinetics OER water splitting, occurs at anode, slow inefficient, especially acid. Currently, main catalysts are still based on noble metals, such as Ir Ru, active components. Hence, exploration new with low cost, high activity, stability has become a key issue research electrolytic production technology. In this paper, mechanism acid was discussed summarized, methods improve activity non-noble metal were summarized categorized. Finally, future prospects made provide little reference idea for development advanced future.

Language: Английский

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Interface coupling induced built-in electric fields boost electrocatalytic oxygen evolution reaction over MOF@LDHs core-shell nanocones

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2023, Volume and Issue: 672, P. 131720 - 131720

Published: May 23, 2023

Language: Английский

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High-Performance Nickel–Bismuth Oxide Electrocatalysts Applicable to Both the HER and OER in Alkaline Water Electrolysis

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

As an electrocatalyst for water electrolysis, nickel oxide (NiO) has received significant attention due to its cost-effectiveness and high reactivity among non-noble-metal-based catalytic materials. However, NiO still exhibits poor alkaline hydrogen evolution reaction (HER) oxygen (OER) kinetics compared conventional noble metal-based catalysts. This is because a strong interaction with protons the HER too low free energy of OH* state, resulting in slower rate-determining step (RDS) OER. To address these issues, adding dopant suggested as efficient method modify electron structure favorably each kinetics. In this context, we demonstrate that Bismuth (Bi), higher electronegativity than Nickel (Ni), induces positive charge on Ni sites. enhances activity by reducing number excessive cation interactions electrocatalyst. Moreover, Bi ratio increases, sites become more positively charged, changes electronic directly impact mechanism. Particularly, it confirmed HER, additives increase proton-adsorbed toward near-zero value and, additionally, decrease difference second considered RDS OER, calculated density functional theory. The effects both OER are demonstrated practical electrochemical evaluations half/single cells. Notably, Bi-containing catalysts Bi05:NiO Bi02:NiO exhibit remarkable kinetics, showing performance improvements 97.0% 21.9%, respectively.

Language: Английский

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NiFe₂O₄ Nanoparticles as Highly Sensitive Electrochemical Sensor for Nitrite Determination

Applied Organometallic Chemistry, Journal Year: 2025, Volume and Issue: 39(4)

Published: March 24, 2025

ABSTRACT Taking into account the harmful influence of superfluous nitrite content onto ecosystem and human health, sensitive real‐time estimation its concentration by developing reduced cost efficient catalytic surfaces seems as a vital problem to be solved. Herein, sensing platform for ions in water samples was designated based on mixed transition metal oxides. NiFe 2 O 4 nanoparticles were fabricated using simple straightforward sol–gel protocol followed calcination at 900°C. Convenient physical characterization tools employed investigate crystal structure, morphological, chemical composition, elemental mapping distribution this formed nanocomposite. The cubic spinel structure confirmed XRD TEM analyses. average crystallite size estimated 25.70 nm wide particle range between 10 50 nm. Cyclic voltammetric study revealed pronounced oxidation current density nanomaterial when contrasted that Fe 3 1.283 times. altering scan rate electrolyte pH during relevant electrochemical measurements electroactivity oxide nanostructure evaluated. Some kinetic parameters reaction nanocomposite including Tafel slope (59.96 mV dec −1 ), exchange (2.13 × −7 A cm −2 diffusion coefficient (1.178 −3 s electron transfer constant (2.074 ) values. linear towards with outstanding sensitivity 70.57 nA μM lowered detection limit 23.9 nM could monitored nanopowder. These encouraging results might focus further efforts synthesizing binary oxides surprising activity numerous analytes determination.

Language: Английский

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Atom doping and alkali etching to construct defect-rich electrocatalysts for efficient overall water splitting

Journal of Water Process Engineering, Journal Year: 2025, Volume and Issue: 74, P. 107856 - 107856

Published: May 1, 2025

Language: Английский

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A simple approach for the synthesis of NiO nanoparticles with both improved OER performance and superparamagnetic behaviour

Solid State Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 107977 - 107977

Published: May 1, 2025

Language: Английский

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Surface modified carbon nanotubes fiber as flexible bifunctional electrocatalyst for overall electrochemical water splitting reactions

Journal of Science Advanced Materials and Devices, Journal Year: 2023, Volume and Issue: 8(4), P. 100638 - 100638

Published: Sept. 28, 2023

Electrocatalytic water splitting is regarded as a promising approach to produce hydrogen which clean and renewable fuel. The process mainly constrained due the sluggish proton-coupled four-electrode transfer at anode for oxygen evolution reaction (OER) with high overpotential requirement. Herein this work, we used one-step hydrothermal method in-situ synthesis of CoSe nanoparticles over surface carbon nanotube-based fiber (CNTs fiber) utilized it bifunctional electrocatalyst electrochemical process. Surface-modified showed excellent performance towards OER low (η10 =414 mV) Tafel slope (77 mVdec-1). We also exploited same material cathode exhibited an (HER) counterpart improved catalytic compared bare CNTs materials. During HER in cathodic potential region, displayed current density 10 mAcm-2 496 mV. Furthermore, during testing overall splitting. outcomes reveal that fabricated electrode can be potentially applied efficient flexible derive fuels reaction.

Language: Английский

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