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High-performance Oxygen Evolution Catalyst Enabled by Interfacial Effect between CeO2 and FeNi Metal-organic Framework
Dai Mimi; Wang, J; Li, LG; Wang, Q; Liu, MN; Zhang, YG
2020-04-15
Source PublicationACTA CHIMICA SINICA
ISSN0567-7351
Issue4Pages:355
SubtypeArticle
AbstractOxygen evolution reaction (OER) is a crucial half reaction of electrochemical water splitting and metal-air batteries. But its sluggish four-electron reaction leads to a high overpotential. Current commercial OER catalysts are mainly noble metal-based materials, but their high cost restricts their broad application. Therefore, extensive efforts have been devoted to exploring low-cost and efficient OER catalysts. Nonprecious metal-based materials have been regarded as promising OER catalyst candidates, due to their abundancy on the earth, controllable morphologies and tunable chemical states. Among various nonprecious metal-based materials, metal-organic frameworks (MOFs) have attracted much attention, because of their large specific surface area and rich metal centers. However, their poor electrochemical activities. stabilities and conductivities severely affect their application in OER catalysis. To improve the activities of MOFs, several methods have been adopted, such as synthesizing ultrathin nanosheets, growing MOFs on nickel foam or carbon cloth, doping heteroatoms, and introducing synergistic interactions between two materials. In 1970, Wagner proposed a space-charge them). which indicates that the carrier property can be tuned through adjusting interface. Inspired by this theory, constructing metal oxide-catalyst interface seems to be a promising strategy to improve activities of catalysts. CeO2 is a well-known cocatalyst due to its reversible Ce3+/Ce4+ redox. Previous works have demonstrated that OER performance can be effectively improved through introducing CeO2 since it can speed up the electron mobility and induce strong interaction between CeO2 and metal sites. In this work, an efficient OER catalyst was achieved through introducing CeO2 into FeNi MOF catalyst. FeNi MOF nanosheet arrays grown on nickel foam was firstly prepared via a solvothennal process. Then CeO2 nanoclusters (5 nm) were coated onto FeNi MOF surface by electrodeposition. A series of characterizations were employed to study the morphology, structure and surface electronic state information of the as-obtained CeO2/FeNi MOF. From X-ray photoelectron spectroscopic analysis, the doping of CeO2 clusters and the strong electronic interaction between CeO2 clusters and FeNi MOF induce the formation of Fe/Ni-O-Ce bonds and optimize the electronic structures of Fe/Ni sites, which will enhance OER activities. The OER performance tests confirm that CeO2/FeNi MOF indeed exhibits a superior OER activity than FeNi MOF alone. The hybrid catalyst delivers a higher mass activity (235.4 A.g(-1)) and a faster turnover frequency (0.065 s(-1)) than those of FeNi MOF (43.8 A.g(-1), 0.018 s(-1)). Compared with FeNi MOF, CeO2/FeNi MOF also shows better OER kinetics, as evidenced by a decreased Tafel slope, a reduced charge transfer resistance. Besides, CeO2/FeNi MOF presents an outstanding stability (50 h, 50 mA.cm(2)). All these features make our CeO2/FeNi MOF a potential catalyst in the future application. The interfacial strategy through introducing CeO2 to modulate Fe and Ni active sites may open a door for developing high-performance OER catalysts in future.
DOI10.6023/A20010017
WOS KeywordEFFICIENT ; CARBON ; FOAM ; ELECTROCATALYSTS ; OXIDATION ; ELECTRODE
Language中文
WOS Research AreaChemistry
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/28133
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Dai Mimi,Wang, J,Li, LG,et al. High-performance Oxygen Evolution Catalyst Enabled by Interfacial Effect between CeO2 and FeNi Metal-organic Framework[J]. ACTA CHIMICA SINICA,2020(4):355.
APA Dai Mimi,Wang, J,Li, LG,Wang, Q,Liu, MN,&Zhang, YG.(2020).High-performance Oxygen Evolution Catalyst Enabled by Interfacial Effect between CeO2 and FeNi Metal-organic Framework.ACTA CHIMICA SINICA(4),355.
MLA Dai Mimi,et al."High-performance Oxygen Evolution Catalyst Enabled by Interfacial Effect between CeO2 and FeNi Metal-organic Framework".ACTA CHIMICA SINICA .4(2020):355.
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