Continuous hydrothermal flow synthesis (CHFS) of Ni-Fe layered double hydroxide (LDH) leads to waterborne dispersions of 2D nanoplatelets in the range of 10-50 nm in lateral size. Conversion of the as-synthesized LDH nanoplatelet dispersion into inkjet printing inks results in high precision patterning and complete substrate coverage with low LDH loadings in the range of μg cm-2. The Ni-Fe LDHs' anisotropy induces a preferential in-plane alignment to a glassy carbon substrate producing low-porosity films. Thin Ni-Fe LDH films in the submicrometer range exhibit superior electrocatalytic activity for the oxygen evolution reaction (OER), with an overpotential of 270 mV at 10 mA cm-2 and a Tafel slope of 32 mV dec-1. The particle alignment creates a compact film and induces a loading-independent electrochemical performance of the Ni-Fe LDH electrodes for loadings above 50 μg cm-2. The combination of CHFS and inkjet printing represents a promising hyphenation of large-scale synthesis and electrode production.
Assembling Ni-Fe Layered Double Hydroxide 2D Thin Films for Oxygen Evolution Electrodes / Rosa M.; Costa Bassetto V.; Girault H.H.; Lesch A.; Esposito V.. - In: ACS APPLIED ENERGY MATERIALS. - ISSN 2574-0962. - ELETTRONICO. - 3:1(2020), pp. 1017-1026. [10.1021/acsaem.9b02055]
Assembling Ni-Fe Layered Double Hydroxide 2D Thin Films for Oxygen Evolution Electrodes
Lesch A.
;
2020
Abstract
Continuous hydrothermal flow synthesis (CHFS) of Ni-Fe layered double hydroxide (LDH) leads to waterborne dispersions of 2D nanoplatelets in the range of 10-50 nm in lateral size. Conversion of the as-synthesized LDH nanoplatelet dispersion into inkjet printing inks results in high precision patterning and complete substrate coverage with low LDH loadings in the range of μg cm-2. The Ni-Fe LDHs' anisotropy induces a preferential in-plane alignment to a glassy carbon substrate producing low-porosity films. Thin Ni-Fe LDH films in the submicrometer range exhibit superior electrocatalytic activity for the oxygen evolution reaction (OER), with an overpotential of 270 mV at 10 mA cm-2 and a Tafel slope of 32 mV dec-1. The particle alignment creates a compact film and induces a loading-independent electrochemical performance of the Ni-Fe LDH electrodes for loadings above 50 μg cm-2. The combination of CHFS and inkjet printing represents a promising hyphenation of large-scale synthesis and electrode production.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
