Recent advances in metal-organic frameworks for oxygen evolution reaction electrocatalysts

Science China Chemistry, Journal Year: 2023, Volume and Issue: 66(10), P. 2754 - 2779

Published: Sept. 11, 2023

Language: Английский

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In Situ Electrochemical Restructuring B‐Doped Metal–Organic Frameworks as Efficient OER Electrocatalysts for Stable Anion Exchange Membrane Water Electrolysis

Small, Journal Year: 2023, Volume and Issue: 20(22)

Published: Dec. 28, 2023

Abstract Metal organic frameworks (MOFs) are promising as effective electrocatalysts toward oxygen evolution reaction (OER). However, the origin of OER activity for MOF‐based is still unclear because their structure reconstruction during electrocatalysis process. Here, a novel MOF (B‐MOF‐Zn‐Co) with spherical superstructure developed by hydrothermal treatment zeolitic imidazolate framework‐Zn, Co (ZIF‐Zn‐Co) using boric acid. The resultant B‐MOF‐Zn‐Co shows high low overpotential 362 mV at 100 mA cm −2 . Remarkably, displays excellent stability only 3.6% voltage delay over 300 h in alkaline electrolyte. Surprisingly, thoroughly transforms into B‐doped CoOOH (B‐CoOOH) electrolysis process, which served actual active material electrocatalytic performance. newly‐formed B‐CoOOH possesses lower energy barrier potential‐determining step (PDS) OOH * formation compared CoOOH, benefiting activity. More importantly, based anion exchange membrane water electrolytic cell (AEMWE) demonstrates continuously durable operation stable current density 200 h, illustrating its potential application practice electrolysis. This work offers an situ electrochemical strategy development and AEMWE.

Language: Английский

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Synthesis of Conductive MOFs and Their Electrochemical Application

Small, Journal Year: 2023, Volume and Issue: 20(17)

Published: Dec. 7, 2023

Abstract Conductive metal–organic frameworks (MOFs) are a type of porous material. It consists metal ions coordinated with highly conjugated organic ligands. The high density carriers and orbital overlap contribute to the amazing conductivity. Additionally, conductive MOFs inherit advantages large specific surface area, structural diversity, adjustable pore size from MOFs. These excellent properties have attracted many researchers explore controllable synthesis electrochemical applications over past decade. This work provides an overview recent advances in strategies highlights their electrocatalysis, supercapacitors, sensors, batteries. Finally, challenges faced by application discussed, as well views on promising solutions for them presented.

Language: Английский

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Zeolitic imidazolate framework induced CoFe-PBA/Carbides hollow cube toward robust bi-functional electrochemical oxygen reaction

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 472, P. 144818 - 144818

Published: July 16, 2023

Language: Английский

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Metal–Organic-Framework-Based Nanoarrays for Oxygen Evolution Electrocatalysis

ACS Nano, Journal Year: 2023, Volume and Issue: 17(24), P. 24564 - 24592

Published: Dec. 4, 2023

The development of highly active and stable electrode materials for the oxygen evolution reaction (OER) is essential widespread application electrochemical energy conversion systems. In recent years, various metal–organic frameworks (MOFs) with self-supporting array structures have been extensively studied because their high porosity, abundant metal sites, flexible adjustable structures. This review provides an overview progress in design, preparation, applications MOF-based nanoarrays OER, beginning introduction architectural advantages characteristics MOFs. Subsequently, design principles robust efficient as OER electrodes are highlighted. Furthermore, detailed discussions focus on composition, structure, performance pristine MOF (MOFNAs) composite nanoarrays. On one hand, effects two components MOFs several modification methods discussed detail MOFNAs. other emphasizes use composed nanomaterials, such oxides, hydroxides, oxyhydroxides, chalcogenides, MOFs, nanoparticles, to guide rational electrodes. Finally, perspectives current challenges, opportunities, future directions this research field provided.

Language: Английский

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Exploring Structural Evolution Behaviors of Ligand‐Defect‐Rich Ferrocene‐Based Metal‐Organic Frameworks for Electrochemical Oxygen Evolution via Operando X‐Ray Absorption Spectroscopy

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

Published: June 25, 2024

Abstract Metal‐organic frameworks (MOFs) have exhibited encouraging catalytic activity for the oxygen evolution reaction (OER), a crucial process water electrolysis to produce green hydrogen. Nonetheless, distinguishing source of and establishing structure‐composition‐property relationships MOFs during OER processes remain challenging. Here, first time, operando X‐ray absorption spectroscopy (XAS) is utilized monitor structural identify active components ferrocene‐based (Ni‐Fc) OER. Ligand‐defect‐rich Ni‐Fc synthesized via co‐deposition method. After electrochemical activation, exhibits superior electrocatalytic (228 mV at 10 mA cm −2 in 0.1 m KOH), which highly competitive compared with state‐of‐the‐art electrocatalysts. Operando XAS analysis ex‐situ characterizations reveal reconstruction into amorphous NiFe‐catalysts (a‐NiFe) activation process, further real phases (a‐NiFe‐C) under potential greater than 1.45 V (vs RHE). In phases, in‐situ formed deprotonated oxygen‐defected Ni oxyhydroxide analogues act as sites, while Fe hydroxide derived from ligands optimize electronic structure sites improving activity. Density functional theory (DFT) indicates reduced energy barrier a‐NiFe‐C pristine MOFs, supporting improved latter.

Language: Английский

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Halogen-Modified Iron-Based Metal–Organic Frameworks for Remarkably Improved Electrocatalytic Oxygen Evolution

The Journal of Physical Chemistry C, Journal Year: 2024, Volume and Issue: 128(5), P. 1936 - 1945

Published: Jan. 24, 2024

Iron-based metal–organic frameworks (MOFs) have shown potential as catalysts for the electrocatalysis oxygen evolution reaction (OER). Despite numerous methods being employed to enhance OER performance of MOFs, influence halogen-containing linkers on electronic structure iron-based MOF remains unexplored. In this study, a series Fe-based MOFs (denoted MOF-R, where R = H, Cl, or Br) with comparable structures are synthesized by changing organic coordinated Fe metal active center, aim investigating activity. Significantly, MOF-Br exhibited superior activity compared MOF-Cl and MOF-H. Density functional theory calculations reveal that tuning halogen groups can modulate sites effectively regulate adsorption behavior key intermediates near optimal d-band leading enhancement electroactivity. Notably, bromine-substituted catalyst displayed remarkable intrinsic activity, including low overpotential 251.2 mV at current density 10 mA cm–2 Tafel slope 44.5 dec–1, surpassing halogen-unsubstituted MOF-H (262.6 63.4 dec–1) commercial IrO2 (335.3 98.6 dec–1). Moreover, high turnover frequency an 300 was measured be 0.537 s–1, which is 30 times greater than (0.018 s–1). This research offers strategy designing electrocatalysts laying solid foundation rational design synthesis excellent in future.

Language: Английский

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Bimetallic NiCo-MOF engineering on foam nickel for efficient oxygen evolution reaction in wide-pH-value water and seawater

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 154093 - 154093

Published: July 17, 2024

Language: Английский

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Electrosynthesis of Transition Metal Coordinated Polymers for Active and Stable Oxygen Evolution

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 22, 2024

Abstract Transition metal coordination polymers (TM‐CP) are promising inexpensive and flexible electrocatalysts for oxygen evolution reaction in water electrolysis, while their facile synthesis controllable regulation remain challenging. Here we report an anodic oxidation‐electrodeposition strategy the growth of TM‐CP (TM=Fe, Co, Ni, Cr, Mn; CP=polyaniline, polypyrrole) films on a variety substrates that act as both catalyst supports ion sources. An exemplified bimetallic NiFe‐polypyrrole (NiFe‐PPy) features superior mechanical stability friction exhibits high activity with long‐term durability alkaline seawater (over 2000 h) anion exchange membrane electrolyzer devices at current density 500 mA cm −2 . Spectroscopic microscopic analysis unravels configurations atomically distributed sites induced by d‐π conjugation, which transforms into mosaic structure NiFe (oxy)hydroxides embedded PPy matrix during evolution. The catalytic performance is ascribed to anchoring effect inhibits dissolution, strong substrate‐to‐catalyst interaction ensures good adhesion, Fe/Ni−N modulates electronic structures facilitate deprotonation *OOH intermediate. This work provides general mechanistic insight building robust inorganic/polymer composite electrodes electrocatalysis.

Language: Английский

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Recent strategies to improve the electroactivity of metal–organic frameworks for advanced electrocatalysis

Deleted Journal, Journal Year: 2024, Volume and Issue: 1(2), P. 181 - 206

Published: Aug. 4, 2024

Abstract Metal–organic frameworks (MOFs) have emerged as promising materials in the realm of electrocatalysis due to their high surface area, tunable porosity, and versatile chemical functionality. However, practical application has been hampered by inherent limitations such low electrical conductivity a limited number active metal sites. Researchers addressed these challenges through various strategies, including enhancing incorporating conductive nanoparticles, modifying structure composition MOFs replacing nodes functionalizing linkers, preparing catalysts thermal processes decarburization conversion into oxides, phosphides (MPs), sulfides (MSs). This review provided comprehensive summary strategies that were employed enhance electroactivity for improved electrocatalytic performance recent years. It also explored future directions potential innovations design synthesis MOF‐based electrocatalysts, offering valuable insights advancing sustainable energy technologies.

Language: Английский

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