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One-pot hydrothermal of Interface-Functionalized of Hematite Nanocrystals for Enhanced Oxygen Evolution Reaction

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Abstract
This report presents a novel methodology for the surface fabrication of electrocatalysts, where hematite is interface-functionalized using organic ligands to enhance the oxygen evolution reaction (OER) performance. All the synthesized samples exhibit a nanoparticle morphology and a crystalline structure consistent with hematite, which is the most stable iron oxide. The functional groups from benzimidazole (bIm) and/or caffeine (Caf) serve as scaffolds and sources of carbon, hydrogen, oxygen, and nitrogen, facilitating metal-support interactions (MSIs) to enhance OER activity. The optimal catalyst, Fe- (bIm)0.3Caf, is synthesized by a combination of predominantly bIm with 30% Caf substitution, which introduces defects and oxygen vacancies, resulting in superior OER performance compared to single-ligand counterparts. The Fe-(bIm)0.3Caf catalyst exhibits the lowest overpotential of 264 mV at 10 mA cm−2 and the smallest Tafel slope of 30 mV dec−1 , outperforming commercial Fe2O3. This highlights the importance of the surface engineering strategy, which modifies the surface and electronic structure of metal nanostructures to achieve efficient OER activity. The report outlines a one-pot hydrothermal process for preparing interface-functionalized hematite nanocrystals at low temperatures, offering a promising approach for achieving efficient and durable OER electrocatalysts.
Author(s)
타이 티 닥 뉴안
Issued Date
2024
Awarded Date
2024-08
Type
Dissertation
Keyword
Oxygen evolution reactionoxygen vacanciesnanoparticleone-pot hydrothermalsurface engineeringinterface-functionalized
URI
https://oak.ulsan.ac.kr/handle/2021.oak/13335
http://ulsan.dcollection.net/common/orgView/200000806060
Alternative Author(s)
THAI THI DAC NGAN
Affiliation
울산대학교
Department
일반대학원 화학공학전공
Advisor
Seung Hyun Hur
Degree
Master
Publisher
울산대학교 일반대학원 화학공학전공
Language
eng
Rights
울산대학교 논문은 저작권에 의해 보호받습니다.
Appears in Collections:
Chemical Engineering > 1. Theses (Master)
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