10.1021/acs.inorgchem.9b03516.s001
Tarandeep Singh
Tarandeep
Singh
Chayanika Das
Chayanika
Das
Neha Bothra
Neha
Bothra
Nivedita Sikdar
Nivedita
Sikdar
Shubhajit Das
Shubhajit
Das
Swapan K. Pati
Swapan K.
Pati
Tapas Kumar Maji
Tapas Kumar
Maji
MOF Derived Co<sub>3</sub>O<sub>4</sub>@Co/NCNT Nanocomposite
for Electrochemical Hydrogen Evolution, Flexible Zinc-Air Batteries,
and Overall Water Splitting
American Chemical Society
2020
Electrochemical Hydrogen Evolution
MOF Derived Co 3 O 4
oxygen evolution reaction
regenerative fuel cells
trifunctional electrocatalyst
Co 3 O 4
hydrogen evolution reaction
carbon fiber cloth
HER
catalyze oxygen reduction reaction
NCNT
OER
ORR
cathode material
Flexible Zinc-Air Batteries
2020-02-13 14:42:31
Journal contribution
https://acs.figshare.com/articles/journal_contribution/MOF_Derived_Co_sub_3_sub_O_sub_4_sub_Co_NCNT_Nanocomposite_for_Electrochemical_Hydrogen_Evolution_Flexible_Zinc-Air_Batteries_and_Overall_Water_Splitting/11848362
Toward the goal of
clean and sustainable energy source, the development
of a trifunctional electrocatalyst is a boon for energy storage and
conversion devices such as regenerative fuel cells and metal-air batteries.
MOF-derived semiconducting-metallic core–shell electrocatalyst <b>Co</b><sub><b>3</b></sub><b>O</b><sub><b>4</b></sub><b>@Co/NCNT</b> (NCNT = nitrogen-doped carbon nanotube),
which was shown to catalyze oxygen reduction reaction (ORR) and oxygen
evolution reaction (OER), is also found to be an active electrocatalyst
for hydrogen evolution reaction (HER) with a low overpotential of
171 mV. Here, the HER activity of <b>Co</b><sub><b>3</b></sub><b>O</b><sub><b>4</b></sub><b>@Co/NCNT</b> is presented and is shown as highly efficient and robust trifunctional
electrocatalyst. The detailed theoretical calculation has found N-center
of Co–N<sub>4</sub> moiety to be the H<sup>+</sup> binding
active site and thus proves <b>Co</b><sub><b>3</b></sub><b>O</b><sub><b>4</b></sub><b>@Co/NCNT</b> to be
active for HER. Further, the ORR and OER bifunctionality of <b>Co</b><sub><b>3</b></sub><b>O</b><sub><b>4</b></sub><b>@Co/NCNT</b> helped in fabricating secondary Zn-air
battery with high power density of 135 mW/cm<sup>2</sup>. Also, an
all-solid-state flexible and wearable battery with <b>Co</b><sub><b>3</b></sub><b>O</b><sub><b>4</b></sub><b>@Co/NCNT</b> as cathode and electrodeposited Zn on carbon fiber
cloth as anode was shown to withstand its performance even under stressed
conditions. Finally, the material being trifunctional in nature was
used both as an anode and cathode material for the electrolysis of
water, which was powered by the Zn-air batteries with <b>Co</b><sub><b>3</b></sub><b>O</b><sub><b>4</b></sub><b>@Co/NCNT</b> as the cathode material. It is believed that the
development of a trifunctional catalyst would help in wide commercialization
of regenerative fuel cells.