Designing MOF Nanoarchitectures for Electrochemical Water Splitting

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(17)

Published: March 22, 2021

Abstract Electrochemical water splitting has attracted significant attention as a key pathway for the development of renewable energy systems. Fabricating efficient electrocatalysts these processes is intensely desired to reduce their overpotentials and facilitate practical applications. Recently, metal–organic framework (MOF) nanoarchitectures featuring ultrahigh surface areas, tunable nanostructures, excellent porosities have emerged promising materials highly active catalysts electrochemical splitting. Herein, most pivotal advances in recent research on engineering MOF are presented. First, design catalytic centers MOF‐based/derived summarized compared from aspects chemical composition optimization structural functionalization at atomic molecular levels. Subsequently, fast‐growing breakthroughs activities, identification sites, fundamental mechanisms thoroughly discussed. Finally, comprehensive commentary current primary challenges future perspectives its commercialization hydrogen production provided. Hereby, new insights into synthetic principles electrocatalysis designing utilization offered, thus further promoting prosperity wide range

Language: Английский

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Two-dimensional conjugated metal–organic frameworks (2D c-MOFs): chemistry and function for MOFtronics

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(4), P. 2764 - 2793

Published: Jan. 1, 2021

Two-dimensional conjugated MOFs are emerging for multifunctional electronic devices that brings us “MOFtronics”, such as (opto)electronics, spintronics, energy devices.

Language: Английский

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A Review of MOFs and Their Composites‐Based Photocatalysts: Synthesis and Applications

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(37)

Published: June 26, 2021

Abstract Photocatalysis is considered to be a green and environment‐friendly technology since it can convert solar energy into other types of chemical energies. Over the past several years, metal‐organic frameworks (MOFs)‐based photocatalysts have received remarkable research interest due their unique morphology, high photocatalytic performance, good stability, easy synthesis, low cost. In this review, synthetic strategies developing MOFs‐based are first introduced. Second, recent progress in fabrication various MOFs composites summarized. Third, different applications including hydrogen evolution reaction, oxygen overall water splitting, nitrogen reduction carbon dioxide reaction as well photodegradation organic pollutants summed up. Finally, challenges some suggestions for future development MOFs‐ composites‐based also highlighted. It expected that report will help researchers systematically devise develop highly efficient based on composites.

Language: Английский

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Conductive Metal–Organic Frameworks with Extra Metallic Sites as an Efficient Electrocatalyst for the Hydrogen Evolution Reaction

Advanced Science, Journal Year: 2020, Volume and Issue: 7(9)

Published: March 16, 2020

Abstract The 2D conductive metal–organic frameworks (MOFs) are expected to be an ideal electrocatalyst due their high utilization of metal atoms. Exploring a new conjugated ligand with extra active metallic center can further boost the structural advantages MOFs. In this work, hexaiminohexaazatrinaphthalene (HAHATN) is employed as construct bimetallic sited MOFs (M2 3 (M1 ∙HAHATN) 2 ) M–N moiety. Density functional theory (DFT) calculations demonstrate that framework renders M2 electric conductivity narrow bandgap (0.19 eV) for electron transfer and favorable in‐plane porous structure (2.7 nm) mass transfer. Moreover, atom at moiety has higher unsaturation degree than 4 linkage, resulting in stronger ability donate electrons enhancing electroactivity. These characteristics endow enhanced electroactivity hydrogen evolution reaction (HER) electrocatalysis. Among series MOF, Ni (Ni nanosheets optimal exhibit small overpotential 115 mV 10 mA cm −2 , low Tafel slope (45.6 dec −1 ), promising electrocatalytic stability HER. This work provides effective strategy designing

Language: Английский

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Exposing unsaturated Cu ₁ -O ₂ sites in nanoscale Cu-MOF for efficient electrocatalytic hydrogen evolution

Science Advances, Journal Year: 2021, Volume and Issue: 7(18)

Published: April 28, 2021

Unsaturated Cu 1 -O 2 sites are effectively exposed in nanoscale Cu-MOF for efficient electrocatalytic hydrogen evolution.

Language: Английский

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2D metal–organic framework-based materials for electrocatalytic, photocatalytic and thermocatalytic applications

Nanoscale, Journal Year: 2021, Volume and Issue: 13(7), P. 3911 - 3936

Published: Jan. 1, 2021

Ultrathin two-dimensional metal-organic frameworks (2D MOFs) have recently attracted extensive interest in various catalytic fields (e.g., electrocatalysis, photocatalysis, thermocatalysis) due to their ultrathin thickness, large surface area, abundant accessible unsaturated active sites and tunable properties. Besides tuning the intrinsic properties of pristine 2D MOFs by changing metal nodes organic ligands, one hot research trends is develop MOF hybrids MOF-derived materials with higher stability conductivity order further increase activity durability. Here, synthesis nanosheets briefly summarized discussed. More attention focused on summaries discussions about applications these MOFs, derived as electrocatalysts, photocatalysts thermocatalysts. The superior performance MOF-based catalysts compared 3D counterparts photocatalysis thermocatalysis are highlighted. enhanced activities derivatives come from sites, a high density nodes, microenvironments around MOFs. Views regarding current future challenges field, new advances science technology meet challenges, also presented. Finally, conclusions outlooks this field provided.

Language: Английский

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Co–Cu Bimetallic Metal Organic Framework Catalyst Outperforms the Pt/C Benchmark for Oxygen Reduction

Journal of the American Chemical Society, Journal Year: 2021, Volume and Issue: 143(10), P. 4064 - 4073

Published: March 4, 2021

Platinum (Pt)-based-nanomaterials are currently the most successful catalysts for oxygen reduction reaction (ORR) in electrochemical energy conversion devices such as fuel cells and metal-air batteries. Nonetheless, Pt have serious drawbacks, including low abundance nature, sluggish kinetics, very high costs, which limit their practical applications. Herein, we report first rationally designed nonprecious Co–Cu bimetallic metal–organic framework (MOF) using a low-temperature hydrothermal method that outperforms electrocatalytic activity of Pt/C ORR alkaline environments. The MOF catalyst surpassed performance Pt/C, exhibiting an onset potential 1.06 V vs RHE, half-wave 0.95 higher stability (ΔE1/2 = 30 mV) after 1000 cycles 0.1 M NaOH. Additionally, it outperformed terms power density cyclability zinc-air This outstanding behavior was attributed to unique electronic synergy Co−Cu centers network, revealed by XPS PDOS.

Language: Английский

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Design Engineering, Synthesis Protocols, and Energy Applications of MOF-Derived Electrocatalysts

Nano-Micro Letters, Journal Year: 2021, Volume and Issue: 13(1)

Published: June 1, 2021

The core reactions for fuel cells, rechargeable metal-air batteries, and hydrogen production are the oxygen reduction reaction (ORR), evolution (OER), (HER), which heavily dependent on efficiency of electrocatalysts. Enormous attempts have previously been devoted in non-noble electrocatalysts born out metal-organic frameworks (MOFs) ORR, OER, HER applications, due to following advantageous reasons: (i) significant porosity eases electrolyte diffusion; (ii) supreme catalyst-electrolyte contact area enhances diffusion efficiency; (iii) electronic conductivity can be extensively increased owing unique construction block subunits MOFs-derived electrocatalysis. Herein, recent progress including synthesis protocols, design engineering, DFT calculations roles, energy applications is discussed reviewed. It concluded that elevated performances attributed an advantageously well-designed high-porosity structure, surface area, plentiful active centers. Furthermore, perspectives MOF-derived presented.

Language: Английский

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Conductive Metal–Organic Frameworks for Supercapacitors

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(52)

Published: March 31, 2022

Abstract As a class of porous materials with crystal lattices, metal–organic frameworks (MOFs), featuring outstanding specific surface area, tunable functionality, and versatile structures, have attracted huge attention in the past two decades. Since first conductive MOF is successfully synthesized 2009, considerable progress has been achieved for development MOFs, allowing their use diverse applications electrochemical energy storage. Among those applications, supercapacitors received great interest because high power density, fast charging ability, excellent cycling stability. Here, efforts hitherto devoted to synthesis design MOFs auspicious capacitive performance are summarized. Using as unique platform medium, electronic molecular aspects storage mechanism electrodes discussed, highlighting advantages limitations inspire new ideas supercapacitors.

Language: Английский

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Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

ACS Nano, Journal Year: 2021, Volume and Issue: 15(8), P. 13399 - 13414

Published: Aug. 4, 2021

To meet the application needs of rechargeable Zn-air battery and electrocatalytic overall water splitting (EOWS), developing high-efficiency, cost-effective, durable trifunctional catalysts for hydrogen evolution reaction (HER), oxygen evolution, reduction (OER ORR) is extremely paramount yet challenging. Herein, interface engineering concept nanoscale hollowing design were proposed to fabricate N-doping carbon nanoboxes confined with Co/MoC nanoparticles. Uniform zeolitic imidazolate framework nanocube was employed as starting material construct electrocatalyst through conformal polydopamine-Mo layer coating subsequent pyrolysis treatment. The Co@IC/MoC@PC catalyst displayed superior electrochemical ORR performances a positive half-wave potential 0.875 V high limiting current density 5.89 mA/cm2. When practically an in regenerative battery, specific capacity 728 mAh/g, large peak power 221 mW/cm2, open-circuit voltage 1.482 V, low charge/discharge gap 0.41 obtained. Moreover, its practicability further exploited by splitting, affording overpotentials 277 68 mV at 10 mA/cm2 OER HER 1 M KOH solution, respectively, decent operating 1.57 EOWS. Ultraviolet photoelectron spectroscopy functional theory calculation revealed that synergistically facilitated charge-transfer, thereby contributing enhancements ORR/OER/HER processes. More importantly, this can offer some interesting prospects construction outstanding toward various energy conversion storage devices.

Language: Английский

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