期刊
CHEMELECTROCHEM
卷 6, 期 7, 页码 2088-2094出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201900423
关键词
carbon dots; hydrothermal synthesis; metal ion doping; electrocatalysis; oxygen evolution reaction
资金
- National key research and development program of China [2016YFB0401701]
- National Science Foundation of China (NSFC) [51433003, 21774041]
- JLU Science and Technology Innovative Research Team [2017TD-06]
Carbon dots (CDs), with abundant functional groups and unique electrical properties, have been widely exploited as an assistant in the preparation of metal-based nanohybrids for electrocatalytic water splitting, but complicated synthetic procedures and high power consumption restricted their practical application. In this work, novel ionic cobalt and iron co-doped CDs (CoFe-CDs) were synthesized in a straightforward manner through the one-step hydrothermal treatment of cobalt gluconate and ferrous gluconate salts. The CoFe-CDs exhibited superior electrocatalytic oxygen evolution reaction activity with a small overpotential of 308 mV at a current density of 10 mA/cm(2), which is comparable and even lower than those of previously reported CDs/Co, Fe-based metal composites. The activity origin of Co-II sites and the synergistic effect of Fe-III within CoFe-CDs were fully understood by DFT calculations and XPS analysis, respectively. This work provides a strategy to construct active metal-ion-doped CDs with boosted electrocatalytic activities, and such new CDs might find potential in the field of energy storage.
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