期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 11, 期 2, 页码 407-416出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ee02972a
关键词
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资金
- National Basic Research Program of China [2013CB632404]
- National Natural Science Foundation of China [51572121, 21603098, 21633004, U1508202]
- International Science & Technology Cooperation Program of China [2014DFE00200]
- State Key Laboratory of NBC Protection for Civilian [SKLNBC2014-09]
- Natural Science Foundation of Jiangsu Province [BK20151265, BK20151383, BK20150580]
- program B for outstanding PhD candidate of Nanjing University [201702B084]
- Fundamental Research Funds for the Central Universities [021314380084]
Graphene-based electrocatalytic materials are potential low-cost electrocatalysts for the oxygen evolution reaction (OER). However, substantial overpotentials above thermodynamic requirements limit their efficiency and stability in OER-related energy conversion and storage technologies. Here, we embedded CrN crystals into graphene and in situ electrochemically oxidized them to construct graphene materials with encapsulated Cr6+ ions (Cr6+@G). These Cr6+@G materials exhibit the lowest OER overpotential of 197 mV at 10 mA cm(-2) and excellent stability over 200 h at a high current density of about 120 mA cm(-2) in an alkaline electrolyte. Spectroscopic and computational studies confirm a stable ion coordination environment significantly benefiting the downshift of the graphene Fermi level via hybridization of C p orbitals with d orbitals of Cr6+ ions that enhances the OER activity and stability.
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