Metal-organic-framework-derived dual-atom catalysts: from synthesis to electrocatalytic applications

Materials Science and Engineering R Reports, Год журнала: 2024, Номер 162, С. 100886 - 100886

Опубликована: Ноя. 23, 2024

Язык: Английский

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Ecologically Sustainable N-doped Graphene Nanosheets as High-Performance Electrodes for Zinc–Air Batteries and Zinc-Ion Supercapacitors

ACS Applied Electronic Materials, Год журнала: 2024, Номер 6(2), С. 1034 - 1044

Опубликована: Фев. 19, 2024

The development of low-cost, green, durable, and high-performance electrocatalysts that accelerate the sluggish kinetics oxygen evolution reduction reactions in metal–air batteries is a subject intense research. Multifunctional nitrogen-doped graphene nanosheets (N-GNS) with impressive electrochemical performance for applications rechargeable Zn–air (ZABs) Zn-ion supercapacitors (ZISCs) have been synthesized by scalable facile pyrolysis method using chickpea as raw material. Benefiting from structural functionalities, synergistic effect between N-doping oxygenated functional groups, high electrical conductivity, availability density catalytically active sites ion reactions, resultant N-GNS exhibited enhanced evolution/reduction performance. ZABs N-GNS-based air cathode excellent cycling stability 100 h@10 mA cm–2 discharge current comparable open circuit voltage (1.43 V) provided peak power 96 mW cm–2. Moreover, electrocatalytic was almost similar to expensive platinum stable voltage. In addition, ZISCs delivered specific capacitance 291 F g–1 at 0.1 A density. capacity retention hybrid devices 86% 100% Coulombic efficiency after 10,000 charge–discharge cycles 10 g–1. acts dual-functional electrode supercapacitors, providing opportunities green sources, especially portable electronics.

Язык: Английский

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Vertical Cross‐Alignments of 2D Semiconductors with Steered Internal Electric Field for Urea Electrooxidation via Balancing Intermediates Adsorption

Small, Год журнала: 2024, Номер 20(34)

Опубликована: Апрель 10, 2024

Abstract Single‐component electrocatalysts generally lead to unbalanced adsorption of OH − and urea during oxidation reaction (UOR), thus obtaining low activity selectivity especially when oxygen evolution (OER) competes at high potentials (>1.5 V). Herein, a cross‐alignment strategy in situ vertically growing Ni(OH) 2 nanosheets on 2D semiconductor g‐C 3 N 4 is reported form hetero‐structured electrocatalyst. Various spectroscopy measurements including experiments indicate the existence enhanced internal electric field interfaces vertical nanosheets, favorable for balancing intermediates. This heterojunction electrocatalyst shows high‐selectivity UOR compared pure , even V) large current density. The computational results show could steer increase urea, efficiently avoiding poisoning strongly adsorbed active sites. A membrane electrode assembly (MEA)‐based electrolyzer with anode operate an industrial‐level density 200 mA cm −2 . work paves avenue designing high‐performance by cross‐alignments components.

Язык: Английский

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Self‐Encapsulated Ni Nanoparticles on Delignified Wood Carbon for Efficient Urea‐Assisted Hydrogen Production

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 8, 2024

Abstract Developing efficient, low‐cost electrocatalysts for industrial‐level hydrogen production remains a significant challenge. Here lattice‐distorted Ni nanoparticles (NPs) encapsulated within nitrogen‐doped carbon shell on delignified wood (Ni‐NC@DWC) are constructed through chitosan‐induced assembly and the pyrolysis process. Experimental theoretical results indicate that lattice distortion due to strong metal‐support interactions, boosts electron transfer reaction intermediate adsorption/desorption, enhancing both urea oxidation (UOR) evolution (HER). Interestingly, active center 3+ ‐O is dynamically cyclically generated during UOR. When utilized as self‐standing electrode in an alkaline electrolyte, Ni‐NC@DWC exhibits low potentials of 24 mV 1.244 V at 100 mA cm −2 HER UOR, respectively. Moreover, achieves ultrasmall cell voltage 1.13 urea‐assisted water splitting can operate stably over 1000 h. Furthermore, when it self‐assembled anion exchange membrane (AEM) electrolyzer, requires only 1.62 2000 industrial operates 150 h without degradation, confirming highly attractive economical, sustainable, scalable production.

Язык: Английский

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Recent progress of advanced electrocatalysts for hydrogen production via hydrazine-assisted water electrolysis

Inorganic Chemistry Frontiers, Год журнала: 2024, Номер 11(19), С. 6218 - 6245

Опубликована: Янв. 1, 2024

This review offers a comprehensive summary of the advanced electrocatalysts for HzOR-assisted water electrolysis. The inherent relationship between various regulatory strategies and catalytic performance is discussed.

Язык: Английский

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