期刊
CHEMICAL ENGINEERING JOURNAL
卷 420, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129690
关键词
Carbon dots; NiFe LDH; Oxygen evolution reaction; Electrocatalysis; Electric field polarization
资金
- National MCF Energy RD Program [2018YFE0306105]
- National Key Research and Development Program of China [2017YFA0204800, 2020YFA0406104, 2020YFA0406103, 2020YFA0406101]
- Innovative Research Group Project of the National Natural Science Foundation of China [51821002]
- National Natural Science Foundation of China [51902217, 91961120, 51725204, 21771132, 51972216, 52041202]
- Natural Science Foundation of Jiangsu Province [BK20190041]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
The electric field polarization strategy can effectively regulate the charged functional groups on the surface of NiFe LDH/CDs composite catalysts, leading to improved OER performance.
Interfacial design and regulation for electrocatalysts can effectively enhance the performance of oxygen evolution reaction (OER). It is still a challenge to search for a simple and easy way to controllably adjust the interface of catalysts. Here we report a new strategy, electric field polarization to regulate the charged functional groups of nickel-iron layered double hydroxide (NiFe LDH)/carbon dots (CDs) composite catalysts. The selectively exposed sulfonate functional groups on CDs under the electric field have regulated the interfacial environment of the composite catalyst. The density function theory (DFT) calculation also reveals that the high electrocatalytic activity can be attributed to H+ capture from *OH or *OOH species by the sulfonated groups on the surface of CDs. Thus, the synergistic effect between the catalytic activity of NiFe LDH and the functional group-modified CDs enhances the OER performance of the composite catalyst, showing low overpotential of 200 mV at 10 mA cm-2 and outstanding kinetics with Tafel slope of 55.2 mV dec-1. Moreover, the polarized composite catalysts can reach a high current density of 51.7 mA cm-2 at 1.46 V vs. reversible hydrogen electrode (RHE), which is 9.2 times higher than the unpolarized one (5.6 mA cm-2).
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