2 research outputs found
Scalable 3‑D Carbon Nitride Sponge as an Efficient Metal-Free Bifunctional Oxygen Electrocatalyst for Rechargeable Zn–Air Batteries
Rational
design of efficient and durable bifunctional oxygen reduction
reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts
is critical for rechargeable metal–air batteries. Here, we
developed a facile strategy for fabricating three-dimensional phosphorus
and sulfur codoped carbon nitride sponges sandwiched with carbon nanocrystals
(P,S-CNS). These materials exhibited high surface area and superior
ORR and OER bifunctional catalytic activities than those of Pt/C and
RuO<sub>2</sub>, respectively, concerning its limiting current density
and onset potential. Further, we tested the suitability and durability
of P,S-CNS as the oxygen cathode for primary and rechargeable Zn–air
batteries. The resulting primary Zn–air battery exhibited a
high open-circuit voltage of 1.51 V, a high discharge peak power density
of 198 mW cm<sup>–2</sup>, a specific capacity of 830 mA h
g<sup>–1</sup>, and better durability for 210 h after mechanical
recharging. An extraordinary small charge–discharge voltage
polarization (∼0.80 V at 25 mA cm<sup>–2</sup>), superior
reversibility, and stability exceeding prolonged charge–discharge
cycles have been attained in rechargeable Zn–air batteries
with a three-electrode system. The origin of the electrocatalytic
activity of P,S-CNS was elucidated by density functional theory analysis
for both oxygen reactions. This work stimulates an innovative prospect
for the enrichment of rechargeable Zn–air battery viable for
commercial applications such as armamentaria, smart electronics, and
electric vehicles
Scalable 3‑D Carbon Nitride Sponge as an Efficient Metal-Free Bifunctional Oxygen Electrocatalyst for Rechargeable Zn–Air Batteries
Rational
design of efficient and durable bifunctional oxygen reduction
reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts
is critical for rechargeable metal–air batteries. Here, we
developed a facile strategy for fabricating three-dimensional phosphorus
and sulfur codoped carbon nitride sponges sandwiched with carbon nanocrystals
(P,S-CNS). These materials exhibited high surface area and superior
ORR and OER bifunctional catalytic activities than those of Pt/C and
RuO<sub>2</sub>, respectively, concerning its limiting current density
and onset potential. Further, we tested the suitability and durability
of P,S-CNS as the oxygen cathode for primary and rechargeable Zn–air
batteries. The resulting primary Zn–air battery exhibited a
high open-circuit voltage of 1.51 V, a high discharge peak power density
of 198 mW cm<sup>–2</sup>, a specific capacity of 830 mA h
g<sup>–1</sup>, and better durability for 210 h after mechanical
recharging. An extraordinary small charge–discharge voltage
polarization (∼0.80 V at 25 mA cm<sup>–2</sup>), superior
reversibility, and stability exceeding prolonged charge–discharge
cycles have been attained in rechargeable Zn–air batteries
with a three-electrode system. The origin of the electrocatalytic
activity of P,S-CNS was elucidated by density functional theory analysis
for both oxygen reactions. This work stimulates an innovative prospect
for the enrichment of rechargeable Zn–air battery viable for
commercial applications such as armamentaria, smart electronics, and
electric vehicles