Details

Autor(en) / Beteiligte

• Tang, Yibo
• Lei, Ying
• Li, Guijun
• Fu, Tiantian
• Xiang, Yang
• Sha, Jingqi
• Yang, Hai
• Yu, Peng
• Si, Yujun
• Guo, Chaozhong

Titel

Positive regulation of active sites for oxygen evolution reactions by encapsulating NiFeO nanoparticles in N-doped carbon nanotubes to construct efficient bifunctional oxygen catalysts for rechargeable Zn-air batteries

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2022-03, Vol.1 (1), p.535-5316

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In this work, a bifunctional oxygen catalyst containing both spinel structure sites and nitrogen doping sites was prepared based on a directional regulation strategy by adding Ni(OH) 2 into a Fe 3+ -melamine precursor and then pyrolyzing the mixture. Melamine was pyrolyzed into N-doped carbon nanotubes, which afford oxygen reduction reaction (ORR) active sites, and meanwhile, the generated NiFe 2 O 4 particles can act as active components for oxygen evolution reactions (OERs). The as-prepared catalyst named Fe-Me-Ni exhibits excellent bifunctional activities for ORRs with a half-wave potential of 0.841 V, and for OERs with an overpotential of 313 mV at 10 mA cm −2 . The Zn-air battery fabricated from Fe-Me-Ni can work at a discharge voltage of 1.23-1.28 V with a specific capacity of 798 mA h g Zn −1 at 10 mA cm −2 , outperforming those of the Pt/C + RuO 2 catalyst (1.17-1.24 V, 787 mA h g Zn −1 ). The battery evaluation results also indicate the remarkable rechargeability and long-term cycling stability of the catalyst Fe-Me-Ni in practical applications. Benefitting from the structure of NiFe 2 O 4 nanoparticles encapsulated in N-doped carbon nanotubes, the Fe-Me-Ni exhibits excellent catalytic activities for ORR and OER, and superior long term discharge-recharge durability.