{"title":"Development of carbon dots supported on Zr-MOFs nano-composites for effective oxygen evolution reaction","authors":"","doi":"10.1016/j.diamond.2024.111559","DOIUrl":null,"url":null,"abstract":"<div><p>Efficient hydrogen generation from water splitting is a key component of the hydrogen economy. It has been extensively researched for decades how electrochemically splitting water using electrocatalysts might provide a sustainable and environmentally friendly hydrogen energy source. Sluggish kinetics of the oxygen evolution reaction (OER) hinders the process of overall water splitting. Although metal-organic frameworks (MOFs) are attractive for generation of effective OER electrocatalysts, their activity is significantly hindered by their inherent lower conductivity. Here, we demonstrate a Zr-MOF-based composite with carbon dots (CDs) in order to increase their OER activity. Its exceptional morphology with higher porosity and greater surface area results in enhanced electrochemical activity. It reveals tremendously low onset potential, i.e., 1.40 V vs. RHE, and a remarkably small overpotential of 1.45 V vs. RHE to attain benchmark current density. It exhibited a minimal Tafel value of 37 mV/dec, conquering state-of-the-art catalysts for OER. The fabricated electrocatalyst demonstrated a lower charge transfer resistance (R<sub>ct</sub>) of 0.248 Ω, with exceptional durability for about 20 h in chronoamperometric studies and for up to 1500 CV cycles. All these results demonstrated that as-fabricated Zr-MOF-based composite is a probable and potential candidate for OER.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3000,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Diamond and Related Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0925963524007726","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, COATINGS & FILMS","Score":null,"Total":0}
引用次数: 0
Abstract
Efficient hydrogen generation from water splitting is a key component of the hydrogen economy. It has been extensively researched for decades how electrochemically splitting water using electrocatalysts might provide a sustainable and environmentally friendly hydrogen energy source. Sluggish kinetics of the oxygen evolution reaction (OER) hinders the process of overall water splitting. Although metal-organic frameworks (MOFs) are attractive for generation of effective OER electrocatalysts, their activity is significantly hindered by their inherent lower conductivity. Here, we demonstrate a Zr-MOF-based composite with carbon dots (CDs) in order to increase their OER activity. Its exceptional morphology with higher porosity and greater surface area results in enhanced electrochemical activity. It reveals tremendously low onset potential, i.e., 1.40 V vs. RHE, and a remarkably small overpotential of 1.45 V vs. RHE to attain benchmark current density. It exhibited a minimal Tafel value of 37 mV/dec, conquering state-of-the-art catalysts for OER. The fabricated electrocatalyst demonstrated a lower charge transfer resistance (Rct) of 0.248 Ω, with exceptional durability for about 20 h in chronoamperometric studies and for up to 1500 CV cycles. All these results demonstrated that as-fabricated Zr-MOF-based composite is a probable and potential candidate for OER.
期刊介绍:
DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices.
The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.