期刊
CHEMSUSCHEM
卷 12, 期 20, 页码 4623-4628出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201902118
关键词
cobalt; heterogeneous catalysis; iron; metal-organic frameworks; surface chemistry
资金
- Foundation of Jiangxi Educational Committee [GJJ180406]
- Doctoral Scientific Research Start-up Foundation of East China University of Technology [DHBK2018043]
- National Natural Science Foundation of China [21871047, 21661001]
Most studies are devoted to the use of metal-organic frameworks (MOFs) as templates to construct desirable electrocatalysts in situ by high-temperature pyrolysis. The emergence of heterostructures invokes new opportunities to use the full potential of pristine MOFs as efficient catalysts in the oxygen evolution reaction (OER). Here, a MOF surface-reaction strategy is developed to synthesize MOF-based heterostructures without pyrolysis. Uniform Fe(OH)(3) nanosheets are grown controllably on the Co-MOF-74 surface by a fast phenol-Fe reaction that takes advantage of the hydroxyl sites in Co-MOF-74. The resulting Fe(OH)(3)@Co-MOF-74 heterostructure delivers an excellent performance in the OER with a low overpotential of 292 mV at 10 mA cm(-2). Notably, the introduction of Fe can improve the intrinsic activity of the original Co atom significantly. The turnover frequency in Fe(OH)(3)@Co-MOF-74 (1.209 s(-1)) is more than 25 times higher than that in Co-MOF-74 (0.048 s(-1)). This work presents a fresh concept for the fundamental design of advanced pure-MOF-based heterostructures and, thereby, provides a new avenue for the fabrication of other energy-conversion and -storage materials.
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