TY - JOUR
T1 - Bifunctional mesoporous CoO/nitrogen-incorporated graphene electrocatalysts for high-power and long-term stability of rechargeable zinc-air batteries
AU - Park, Tae Ho
AU - Yeon, Jeong Seok
AU - Sivakumar, Periyasamy
AU - Kim, Youngkwon
AU - Park, Ho Seok
N1 - Publisher Copyright:
© 2020 John Wiley & Sons Ltd
PY - 2021/4
Y1 - 2021/4
N2 - Despite high energy density, low-cost, and ecofriendly, rechargeable Zinc-air batteries (ZABs) suffer from sluggish kinetics stability during oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) at the cathode. Herein, we demonstrate CoO nanoparticles anchored on N-doped reduced graphene oxide (CoO/N-rGO) with an excellent bifunctional catalytic activity and stability and facile redox kinetics of ORR and OER for high-performance rechargeable ZABs. The CoO/N-rGO catalysts are featured with the abundant active sites, a large accessible area, and high electrochemical conductivity, which are associated with increased oxygen vacancy surface, reduced valence, and mesoporous architecture. The half-wave potential (E1/2) and electron transfer number for ORR are 0.79 V and 3.72 at 0.40 V (vs RHE), respectively, while OER potential at 10 mA cm−2 (Ej = 10) is 1.61 V (vs RHE). Remarkably, the ZAB cell with CoO/N-rGO achieves high specific capacity of 545 mAh gzn−1, power density of 41 mW cm−2, and cyclic stabilities with high energy efficiency of 64.44% at 2 mA cm−2. In addition, postmortem analysis validates that the oxidation and aggregation of CoO/N-rGO catalyst is mitigated while the inactivation of Zn anode is inhibited.
AB - Despite high energy density, low-cost, and ecofriendly, rechargeable Zinc-air batteries (ZABs) suffer from sluggish kinetics stability during oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) at the cathode. Herein, we demonstrate CoO nanoparticles anchored on N-doped reduced graphene oxide (CoO/N-rGO) with an excellent bifunctional catalytic activity and stability and facile redox kinetics of ORR and OER for high-performance rechargeable ZABs. The CoO/N-rGO catalysts are featured with the abundant active sites, a large accessible area, and high electrochemical conductivity, which are associated with increased oxygen vacancy surface, reduced valence, and mesoporous architecture. The half-wave potential (E1/2) and electron transfer number for ORR are 0.79 V and 3.72 at 0.40 V (vs RHE), respectively, while OER potential at 10 mA cm−2 (Ej = 10) is 1.61 V (vs RHE). Remarkably, the ZAB cell with CoO/N-rGO achieves high specific capacity of 545 mAh gzn−1, power density of 41 mW cm−2, and cyclic stabilities with high energy efficiency of 64.44% at 2 mA cm−2. In addition, postmortem analysis validates that the oxidation and aggregation of CoO/N-rGO catalyst is mitigated while the inactivation of Zn anode is inhibited.
KW - bifunctional catalysts
KW - cobalt monoxide
KW - mesoporous structure
KW - nitrogen doping
KW - zinc-air batteries
UR - http://www.scopus.com/inward/record.url?scp=85096981252&partnerID=8YFLogxK
U2 - 10.1002/er.6263
DO - 10.1002/er.6263
M3 - Article
AN - SCOPUS:85096981252
SN - 0363-907X
VL - 45
SP - 6698
EP - 6707
JO - International Journal of Energy Research
JF - International Journal of Energy Research
IS - 5
ER -