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Self-Assembly of Two-Dimensional Bimetallic Nickel–Cobalt Phosphate Nanoplates into One-Dimensional Porous Chainlike Architecture for Efficient Oxygen Evolution Reaction
journal contribution
posted on 2020-08-06, 22:21 authored by Ni Luh
Wulan Septiani, Yusuf Valentino Kaneti, Kresna Bondan Fathoni, Kenya Kani, Abeer Enaiet Allah, Brian Yuliarto, Nugraha, Hermawan Kresno Dipojono, Zeid A. Alothman, Dmitri Golberg, Yusuke YamauchiThe
self-assembly of two-dimensional (2D) nanostructures into one-dimensional
(1D) nanoarchitectures may result in materials which combine the unique
physicochemical properties of 2D nanostructures with the excellent
charge transport properties of 1D architectures. Herein, we report
the self-stacking of 2D nickel–cobalt (Ni–Co) phosphate
nanoplates into 1D chainlike architectures with the assistance of
metal glycerates as self-templates. This unique self-assembly process
is driven by the adsorbed ethyl glycerate on the surface of the individual
nanoplates, which promotes the subsequent growth of the new nanoplate
on top of the previously formed nanoplate, thereby leading to the
self-stacking of these nanoplates along the vertical direction. The
flexibility of the proposed method is also highlighted by the feasible
preparation of nickel phosphate with the same self-assembled structure.
When tested as a catalyst for oxygen evolution reaction (OER) in an
alkaline medium, the bimetallic Ni–Co phosphate (derived from
Ni-Co-TEP) with the nanoplate-assembled chainlike structure displays
much lower overpotential (η10= 310 mV) and Tafel
slope (68 mV dec–1) than its pristine counterparts.
The enhanced OER activity of this bimetallic catalyst may be attributed
to (i) the highly interconnected structure and the bimetallic composition
which promote improved charge transport; (ii) the porous chainlike
structure which provides increased number of active sites, facilitates
easier electrolyte infiltration, and promotes good electrical contact
with the electrolyte, and (iii) the presence of Ni3+ and
Co3+ active sites (nickel–cobalt (oxy)hydroxides)
which can promote the chemisorption of OH– and facilitate
electron transfer from the OH– to the surface Ni/Co
sites during OER.
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Keywords
bimetallic compositionself-assembly processself-stackingOHnickel phosphatemetal glycerates2 D nanostructuresself-assembled structure1 D architecturesOne-Dimensional Porous Chainlike Ar...nanoplatecharge transport propertieselectron transferelectrolyte infiltrationNioxygen evolution reactionbimetallic catalystOER activityethyl glyceratesitesurface1 D310 mVcharge transportEfficient Oxygen Evolution Reactionphysicochemical propertiesstructure displays
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