A comprehensive review on the electrochemical parameters and recent material development of electrochemical water splitting electrocatalysts

RSC Advances, Journal Year: 2023, Volume and Issue: 13(6), P. 3843 - 3876

Published: Jan. 1, 2023

Electrochemical splitting of water is an appealing solution for energy storage and conversion to overcome the reliance on depleting fossil fuel reserves prevent severe deterioration global climate. Though there are several cells, hydrogen (H

Language: Английский

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Conductive Metal–Organic Frameworks with Tunable Dielectric Properties for Boosting Electromagnetic Wave Absorption

ACS Nano, Journal Year: 2023, Volume and Issue: 17(13), P. 12510 - 12518

Published: June 23, 2023

Metal-organic frameworks (MOFs) manifest enormous potential in promoting electromagnetic wave (EMW) absorption thanks to the tailored components, topological structure, and high porosity. Herein, rodlike conductive MOFs (cMOFs) composed of adjustable metal ions Zn, Cu, Co, or Ni ligands hexahydroxytriphenylene (HHTP) are prepared attain tunable dielectric properties for a EMW absorption. Specifically, influences cMOFs' composition, charge transport characteristic, crystalline anisotropy microstructure on performance ascertained, advancing understanding attenuation mechanisms MOFs. The boosted polarization losses derived from conjugation effects terminal groups, as well shape anisotropy, lead prominent cMOFs. Cu-HHTP confers minimum reflection loss (RLmin) -63.55 dB at thickness 2.9 mm maximum effective bandwidth 5.2 GHz. Moreover, Zn-HHTP showcases superiority S-band (2-4 GHz) with an RLmin -62.8 1.9 mm. This work not only hoists mechanistic structure-function relationships cMOFs but also offers guidelines preparing functional MOF materials.

Language: Английский

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Integration of Alloy Segregation and Surface CoO Hybridization in Carbon‐Encapsulated CoNiPt Alloy Catalyst for Superior Alkaline Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(41)

Published: July 28, 2023

Abstract Constructing an efficient alkaline hydrogen evolution reaction (HER) catalyst with low platinum (Pt) consumption is crucial for the cost reduction of energy devices, such as electrolyzers. Herein, nanoflower‐like carbon‐encapsulated CoNiPt alloy catalysts composition segregation are designed by pyrolyzing morphology‐controlled and Pt‐proportion‐tuned metal–organic frameworks (MOFs). The optimized containing 15% NFs (15%: Pt mass percentage, NFs: nanoflowers) exhibits outstanding HER performance a overpotential 25 mV at current density 10 mA cm −2 , far outperforming those commercial Pt/C (47 mV) most advanced catalysts. Such superior activity originates from integration Co‐O hybridization. hierarchical structure guarantees full exposure sites. Density functional theory calculations suggest that components not only promote water dissociation but also facilitate adsorption process, synergistically accelerating kinetics HER. In addition, volcanically distributed surface oxygen content, mainly in form Co 3d O 2p hybridization, which another reason enhanced activity. This work provides feasible insights into design cost‐effective coordinating kinetic sites adjusting appropriate content.

Language: Английский

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Zirconium-based metal-organic frameworks for fluorescent sensing

Coordination Chemistry Reviews, Journal Year: 2022, Volume and Issue: 476, P. 214930 - 214930

Published: Nov. 15, 2022

Language: Английский

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Iron-based metal–organic frameworks and their derived materials for photocatalytic and photoelectrocatalytic reactions

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 499, P. 215538 - 215538

Published: Nov. 1, 2023

Language: Английский

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Waste-Derived Catalysts for Water Electrolysis: Circular Economy-Driven Sustainable Green Hydrogen Energy

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 15(1)

Published: Dec. 1, 2022

The sustainable production of green hydrogen via water electrolysis necessitates cost-effective electrocatalysts. By following the circular economy principle, utilization waste-derived catalysts significantly promotes development energy. Currently, diverse have exhibited excellent catalytic performance toward evolution reaction (HER), oxygen (OER), and overall (OWE). Herein, we systematically examine recent achievements in electrocatalysts for electrolysis. general principles design efficient are discussed, followed by illustration current strategies transforming wastes into Then, applications (i.e., carbon-based catalysts, transitional metal-based heterostructure catalysts) HER, OER, OWE reviewed successively. An emphasis is put on correlating catalysts' structure-performance relationship. Also, challenges research directions this booming field finally highlighted. This review would provide useful insights design, synthesis, electrocatalysts, thus accelerate economy-driven energy scheme.

Language: Английский

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Applications of Metal–Organic Frameworks and Their Derivatives in Electrochemical CO2 Reduction

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: April 30, 2023

Abstract Electrochemically reducing CO 2 to more reduced chemical species is a promising way that not only enables the conversion of intermittent energy resources stable fuels, but also helps build closed-loop anthropogenic carbon cycle. Among various electrocatalysts for electrochemical reduction, multifunctional metal–organic frameworks (MOFs) have been employed as highly efficient and selective heterogeneous due their ultrahigh porosity topologically diverse structures. Up now, great progress has achieved in design synthesis active MOF-related catalysts reduction reaction (CO RR), corresponding mechanisms thoroughly studied. In this review, we summarize recent applying MOFs derivatives RR, with focus on strategies electrolyzers. We first discussed different RR products introduced commonly applied electrolyzer configurations current system. Then, an overview several categories (CO, HCOOH, CH 4 , 3 OH, multi-carbon chemicals) generated from or via was discussed. Finally, offer some insights perspectives future development reduction. aim provide new into field further guide research large-scale applications.

Language: Английский

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Constructing Nitrogen‐Doped Carbon Hierarchy Structure Derived from Metal‐Organic Framework as High‐Performance ORR Cathode Material for Zn‐Air Battery

Small, Journal Year: 2023, Volume and Issue: 20(3)

Published: Sept. 10, 2023

Abstract The development of efficient and low‐cost catalysts for cathodic oxygen reduction reaction (ORR) in Zn‐air battery (ZAB) is a key factor reducing costs achieving industrialization. Here, novel segregated CoNiPt alloy embedded N‐doped porous carbon with nanoflowers (NFs)‐like hierarchy structure synthesized through pyrolyzing Hofmann‐type metal‐organic frameworks (MOFs). unique hierarchical NFs exposes more active sites facilitates the transportation intermediates, thus accelerating kinetics. Impressively, resulting 15% CoNiPt@C catalyst exhibits outstanding alkaline ORR activity half‐wave potential 0.93 V, its mass 7.5 times higher than that commercial Pt/C catalyst, surpassing state‐of‐the‐art noble metal‐based catalysts. Furthermore, assembled CoNiPt@C+RuO2 ZAB demonstrates maximum power density 172 mW cm −2 , which superior to Pt/C+RuO2 ZAB. Experimental results reveal intrinsic attributed synergistic interaction between defects pyrrolic/graphitic N species, optimizes adsorption energy intermediate species process greatly enhances catalytic activity. This work provides practical feasible strategy synthesizing cost‐effective by optimizing electronic MOF‐derived

Language: Английский

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Low-temperature synthesis of nano-porous high entropy spinel oxides with high grain boundary density for oxygen evolution reaction

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 460, P. 141675 - 141675

Published: Feb. 2, 2023

Language: Английский

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UiO-66/Carboxylated Multiwalled Carbon Nanotube Composites for Highly Efficient and Stable Voltammetric Sensors for Gatifloxacin

ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 6(20), P. 19403 - 19413

Published: Oct. 12, 2023

The excessive use of gatifloxacin (GAT) can seriously pollute the environment and damage human health. Therefore, reliable detection its concentration is essential for environmental protection physical Herein, an efficient stable voltammetric sensor based on zirconium-based metal–organic framework/carboxylated multiwalled nanotube nanocomposites (UiO-66/MWCNT-COOH) was constructed determination GAT. morphologies, microstructures, electrochemical properties UiO-66/MWCNT-COOH were investigated by using various microscopic, spectroscopic, techniques. showed good electrocatalytic activity GAT oxidation with remarkable response signals, which primarily attributed to synergistic effect from UiO-66 MWCNT-COOH. Electrochemical kinetics studies revealed that irreversible diffusion-limited reaction involving two protons electrons. anodic peak current linearly correlated in range 0.05 10 μM a low limit 0.0075 μM. Moreover, demonstrated high selectivity, reproducibility, repeatability as well extraordinary long-term stability (at least 7 weeks). proposed reliably detected trace effluent, milk, serum, eye drops satisfactory recoveries. Together outstanding merits such cost, robust response, short assay time, sensitivity, shows enormous prospects situ multiple antibiotics.

Language: Английский

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