5 years ago

NiFe Layered Double Hydroxide Nanoparticles on Co,N-Codoped Carbon Nanoframes as Efficient Bifunctional Catalysts for Rechargeable Zinc–Air Batteries

NiFe Layered Double Hydroxide Nanoparticles on Co,N-Codoped Carbon Nanoframes as Efficient Bifunctional Catalysts for Rechargeable Zinc–Air Batteries
Qing Wang, Tierui Zhang, Li-Zhu Wu, Yufei Zhao, Lu Shang, Chen-Ho Tung, Xin Zhang, Geoffrey I. N. Waterhouse, Run Shi
The future large-scale deployment of rechargeable zinc–air batteries requires the development of cheap, stable, and efficient bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In this work, a highly efficient bifunctional electrocatalyst is prepared by depositing 3–5 nm NiFe layered double hydroxide (NiFe-LDH) nanoparticles on Co,N-codoped carbon nanoframes (Co,N-CNF). The NiFe-LDH/Co,N-CNF electrocatalyst displayed an OER overpotential of 0.312 V at 10 mA cm−2 and an ORR half-wave potential of 0.790 V. The outstanding performance of the electrocatalyst is attributable to the high electrical conductivity and excellent ORR activity of Co,N-CNF, together with the strong anchoring of 3–5 nm NiFe-LDH nanoparticles, which preserves active sites. Inspired by the excellent OER and ORR performance of NiFe-LDH/Co,N-CNF, a prototype rechargeable zinc–air battery is developed. The battery exhibited a low discharge–charge voltage gap (1.0 V at 25 mA cm−2) and long-term cycling durability (over 80 h), and superior overall performance to a counterpart battery constructed using a mixture of IrO2 and Pt/C as the cathode. The strategy developed here can easily be adapted to synthesize other bifunctional CNF-based hybrid electrodes for ORR and OER, providing a practical route to more efficient rechargeable zinc–air batteries. A bifunctional NiFe-layered double hydroxide (LDH)/Co,N-carbon nanoframe (CNF) electrocatalyst, comprising 3–5 nm NiFe-LDH particles immobilized on Co,N-doped carbon nanoframes (Co,N-CNF), demonstrates excellent activities for both oxygen evolution reaction and oxygen reduction reaction, and outstanding performance and stability as cathode catalysts in rechargeable zinc–air batteries. Intimate contact between NiFe-LDH and Co,N-CNF preventing NiFe-LDH aggregation is the key to the higher electrocatalytic activity and stability of NiFe-LDH/Co,N-CNF compared to precious metal-based catalysts.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700467

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