期刊
NEW JOURNAL OF CHEMISTRY
卷 43, 期 17, 页码 6555-6562出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nj00518h
关键词
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资金
- National Natural Science Foundation of China [21673137]
- Science and Technology Commission of Shanghai Municipality [16ZR1413900]
A novel strategy to boost the oxygen evolution reaction (OER) activity of NiFe-LDHs has been developed using reduced graphene oxide (rGO) as both the substrate and electronic carrier. Basically, a GO hydrogel is printed on Ni foam by the doctor blade technique, forming a GO matrix embedded in Ni foam, which is then freeze-dried to turn into a 3-dimensional (3D) porous GO (3D-GO) matrix. NiFe-layered double hydroxide (NiFe-LDH) nanoflakes anchored on the 3D-GO matrix embedded in Ni foam are synthesized by a hydrothermal process, together with the in situ reduction of 3D-GO. The obtained electrode has a high degree of reduction of the porous graphene oxide, the mechanical strength of the NiFe-LDH nanoflakes anchored on the matrix, large active surface area and excellent interface conjunction. Based on optimal conditions, the fabricated electrode shows outstanding electrocatalytic oxygen evolution reaction performance in 1 M KOH aqueous solution, achieving a small overpotential of 170 mV, a Tafel slope of 57 mV decade(-1) at a current density of 20 mA cm(-2) and a relatively stable operating potential after 2000 cycles of the CV test.
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