Journal article
Electronic structure modulation with ultrafine Fe3O4 nanoparticles on 2D Ni-based metal-organic framework layers for enhanced oxygen evolution reaction
Department of Chemistry, Technical University of Denmark1
Chinese Academy of Sciences2
Molecular Windows, Nanocharacterization, National Centre for Nano Fabrication and Characterization, Technical University of Denmark3
Nanocharacterization, National Centre for Nano Fabrication and Characterization, Technical University of Denmark4
National Centre for Nano Fabrication and Characterization, Technical University of Denmark5
Two-dimensional (2D) metal organic frameworks (MOFs) are emerging as low-cost oxygen evolution reaction (OER) electrocatalysts, however, suffering aggregation and poor operation stability. Herein, ultrafine Fe3O4 nanoparticles (diameter: 6 ± 2 nm) are homogeneously immobilized on 2D Ni based MOFs (Ni-BDC, thickness: 5 ± 1 nm) to improve the OER stability.
Electronic structure modulation for enhanced catalytic activity is studied via adjusting the amount of Fe3O4 nanoparticles on Ni-BDC. The optimal Fe3O4/Ni-BDC achieves the best OER performance with an overpotential of 295 mV at 10 mA cm-2, a Tafel slope of 47.8 mV dec-1 and a considerable catalytic durability of more than 40 h (less than 5 h for Ni-BDC alone).
DFT calculations confirm that the active sites for Fe3O4/Ni-BDC are mainly contributed by Fe species with a higher oxidation state, and the potential-determining step (PDS) is the formation of the adsorbed O* species, which are facilitated in the composite.
Language: | English |
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Year: | 2022 |
Pages: | 78-88 |
ISSN: | 20954956 |
Types: | Journal article |
DOI: | 10.1016/j.jechem.2021.05.030 |
ORCIDs: | Engelbrekt, Christian , Xiao, Xinxin , Tang, Jing , Diao, Fangyuan , Nulati Yesibolati, Murat , Zhang, Jingdong and Mølhave, Kristian |