Advanced Functional NiCo₂S₄@CoMo₂S₄ Heterojunction Couple as Electrode for Hydrogen Production via Energy‐Saving Urea Oxidation

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

Abstract The urea oxidation reaction (UOR) is characterized by a lower overpotential compared to the oxygen evolution (OER) during electrolysis, which facilitates hydrogen (HER) at cathode. Charge distribution, can be modulated introduction of heterostructure, plays key role in enhancing adsorption and cleavage chemical groups within molecules. Herein, facile all‐room temperature synthesis functional heterojunction NiCo 2 S 4 /CoMo grown on carbon cloth (CC) presented, as‐prepared electrode served as catalyst for simultaneous reaction. Density Functional Theory (DFT) study reveals spontaneous transfer charge heterointerface , triggers formation localized electrophilic/nucleophilic regions electron donating/electron withdrawing group molecules UOR. // pair required only cell voltage 1.17 1.18 V deliver current density 10 100 mA cm −2 respectively electrolysis display very good stability. Tests performed real urine samples show similar catalytic performance electrolytes, making work one best transition metal‐based catalysts UOR applications, promising both efficient production decomposition.

Language: Английский

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Ultrastable Ti@Ir core–shell catalyst with low iridium loading for water electrolysis at industrial-level current density

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160118 - 160118

Published: Feb. 1, 2025

Language: Английский

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Feasibility of Active and Durable Lattice Oxygen‐Mediated Oxygen Evolution Electrocatalysts in Proton Exchange Membrane Water Electrolyzers Through d⁰ Metal Ion Incorporation

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 28, 2025

Abstract The primary hurdle faced in the practical application of proton exchange membrane water electrolyzer (PEMWE) involves improving intrinsic kinetic activity oxygen evolution reaction (OER) electrocatalysts while concurrently enhancing their durability. Although based on lattice oxygen‐mediated mechanism (LOM) have potential to significantly enhance OER without being restricted by scaling relationships, they are neglected acidic electrolytes due limited In this study, an innovative approach is presented simultaneously promote activation and improve durability LOM‐based incorporating d 0 metal ions into RuO 2 electrocatalyst. Leveraging unique electronic properties ion, O 2p band center Ru‐O covalency electrocatalyst successfully engineered, resulting change mechanism. Furthermore, a single cell PEMWE, demonstrates outstanding performance, achieving 3.0 A cm −2 at 1.81 V maintaining for 100 h 200 mA , surpassing commercial . This strategy challenges traditional viewpoint that suppressing essential PEMWE durability, offering new perspectives development electrolytes.

Language: Английский

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Strain‐Engineered Ir Shell Enhances Activity and Stability of Ir‐Ru Catalysts for Water Electrolysis: An Operando Wide‐Angle X‐Ray Scattering Study

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 20, 2024

Abstract Ir‐Ru alloys with high Ru content serve as stable and highly active catalysts for the Oxygen Evolution Reaction (OER) in Proton Exchange Membrane Water Electrolyzers (PEM‐WEs), enabling efficient operation low Ir loadings (150 µg cm − 2 ). Despite this, mechanisms behind their enhanced stability remain unclear. In this study, operando Wide‐Angle X‐ray Scattering (WAXS) ex situ techniques are utilized to investigate structural evolution of these magnetron‐sputtered during a PEM‐WE operation. The findings reveal that leaches from surface upon potential application, forming dynamic Ir‐Ru@IrO x core‐shell structure. shell, strained by core, maintains lower oxidation state than pure catalyst, leading superior catalytic activity stability. Remarkably, 25:75 catalyst demonstrates better over 50:50, despite its higher content, due protection subsurface dissolution. This study not only clarifies performance‐enhancing but also suggests other, more economical materials, such Co or Ti, could effective cores Ir‐M systems, offering pathway cost‐effective applications.

Language: Английский

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Iridium-based electrocatalysts for acidic oxygen evolution reaction

Journal of Energy Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 1, 2024

Language: Английский

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