Journal
NANO ENERGY
Volume 35, Issue -, Pages 350-357Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.04.011
Keywords
Trinary layered double hydroxides; Two-dimensional layered materials; Ultrathin nanosheets; Oxygen evolution reaction; Electrocatalysis in alkaline solution
Categories
Funding
- National Natural Science Foundation of China [21403105, 21573108]
- National 973 Basic Research Program [2015CB659300]
- National Materials Genome Project [2016YFB0700600]
- China Postdoctoral Science Foundation [2015M581775, 2016M601767]
- Natural Science Foundation of Jiangsu Province [BK20150583, BK20160643]
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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Recently, Ni-based layered double hydroxide (LDH) materials have attracted growing interest owing to the remarkable performance for oxygen evolution reaction (OER). Here we demonstrate the preparation of ultrathin Ni3FeAlx trinary LDH nanosheets with higher activity and stability than NiFe-LDH nanosheets for OER. The enhancement was derived from Al substitution, which increased the concentration of Ni3+ active sites on the catalyst surface. Besides, low-coordinated Ni and Fe atoms and defects were formed by partial etching/dissolution of Al3+ in alkaline solution, which further increased the activity towards OER. To improve the conductivity, Ni3FeAlx-LDH (x= 0, 0.91, 1.27 or 2.73) nanosheets were also in-situ grown on three-dimensional-networked nickel foam. The binder-free Ni3FeAlx-LDH/Ni foam electrodes exhibited further improved catalytic performance compared to the electrodes made of powdery Ni3FeAlx-LDHs and nafion binder. The best OER performance was presented by Ni3FeAl0.91-LDH/Ni foam, showing a Tafel slope of 57 mV/dec, a low overpotential (304 mV) at the current density of 20 mA/cm(2), and a current density of 235 mA/cm(2) at 1.60 V (vs. RHE). Furthermore, the Ni3FeAl0.91-LDHs/Ni foam electrode showed excellent long-term stability, maintaining a stable overpotential of 320 mV at 20 mA/cm(2) after testing for 18 h.
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