cm9b02397_si_001.pdf (768.01 kB)
Distorted Inverse Spinel Nickel Cobaltite Grown on a MoS2 Plate for Significantly Improved Water Splitting Activity
journal contribution
posted on 2019-08-23, 18:45 authored by Jiangtian Li, Deryn Chu, David R. Baker, Hong Dong, Rongzhong Jiang, Dat T. TranSluggish
water dissociation kinetics on nonprecious metal oxide electrocatalysts
is considered as the rate-limiting step for the development of hydrogen
evolution in alkaline media. A unique heterostructure, a distorted
inverse spinel Ni–Co–O layer on MoS2 plate,
was developed in this paper. The formation of Mo–O–Co
covalent bonds at the interface allows for the inherent electron transfer
from MoS2 to the adjacent surface spinel and forces the
nucleation and creation of disordered inverse spinel. Such a crystal-distorted
structure enables the substantially improved activity for hydrogen
evolution reaction (HER) by more than 40 times and oxygen evolution
reaction (OER) by 2.5 times compared to the regular spinel nickel
cobaltite. Through a comprehensive kinetics study, the results reveal
that this inverse spinel layer promotes the water dissociation process
and the intrinsic HER activity by decreasing the apparent activation
energy barrier Ea, increasing the exchange
current density j0, and improving the
charge-transfer rate. Meanwhile, the oxygen vacancy-mediated Ni3+ active center and the facilitated charge transfer are responsible
for OER activity improvement. Such a unique heterostructure demonstrates
robust stability for HER, OER, and overall water splitting in alkaline
electrolytes. Our work provides a novel concept to design effective
metal oxide-based HER and OER catalysts in alkaline electrolyte.
History
Usage metrics
Categories
Keywords
Water Splitting Activityelectrolyte2.5 timesspinel layerDistorted Inverse Spinel Nickel Cobaltite Growncharge transferMoS 2 platehydrogen evolutionactivation energy barrier Ewater dissociation kineticsMoS 2kinetics studyhydrogen evolution reactionelectron transfernonprecious metal oxide electrocatalystsnovel conceptwater splittingoxygen evolution reaction40 timescharge-transfer raterate-limiting stepSuchsurface spinelOER activity improvementMoS 2 PlateOER catalystscrystal-distorted structurewater dissociation processHER activitymetal oxide-based HERspinel nickel cobaltitedensity j 0heterostructure
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC