Details

Autor(en) / Beteiligte

• Wang, Jie
• Wu, Zexing
• Han, Lili
• Lin, Ruoqian
• Xin, Huolin L.
• Wang, Deli

Titel

Hollow-Structured Carbon-Supported Nickel Cobaltite Nanoparticles as an Efficient Bifunctional Electrocatalyst for the Oxygen Reduction and Evolution Reactions

Ist Teil von

• ChemCatChem, 2016-02, Vol.8 (4), p.736-742

Ort / Verlag

Weinheim: Blackwell Publishing Ltd

Erscheinungsjahr

2016

Quelle

Wiley Online Library

Beschreibungen/Notizen

• The exploration of efficient electrocatalysts for both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is essential for fuel cells and metal‐air batteries. In this study, we developed 3 D hollow‐structured NiCo2O4/C nanoparticles with interconnected pores as bifunctional electrocatalysts, which are transformed from solid NiCo2 alloy nanoparticles through the Kirkendall effect. The unique hollow structure of NiCo2O4 nanoparticles increases the number of active sites and improves contact with the electrolyte to result in excellent ORR and OER performances. In addition, the hollow‐structured NiCo2O4/C nanoparticles exhibit superior long‐term stability for both the ORR and OER compared to commercial Pt/C. The template‐ and surfactant‐free synthetic strategy could be used for the low‐cost and large‐scale synthesis of hollow‐structured materials, which would facilitate the screening of high‐efficiency catalysts for energy conversion. A new direction in three dimensions: 3 D hollow‐structured NiCo2O4 nanoparticles with interconnected pores as bifunctional electrocatalysts are transformed from solid NiCo2 alloy nanoparticles through the Kirkendall effect. The unique hollow structure of the NiCo2O4 nanoparticles with a rough surface increases the number of active sites, improves the contact between the electrolyte and catalyst surfaces, and imparts superior long‐term stability for both the oxygen reduction and evolution reactions compared to commercial Pt/C.