Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 9, Issue 10, Pages 2532-2542Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cy00266a
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Funding
- National Natural Science Foundation of China [51874243, 51271148, 50971100]
- Research Fund of the State Key Laboratory of Solidification Processing in China [150-ZH-2016]
- Aeronautic Science Foundation Program of China [2012ZF53073]
- Project of Transformation of Scientific and Technological Achievements of NWPU [19-2017]
- Open Fund of the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology) [2018-KF-18]
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Exploring cheap and efficient electrocatalysts for the oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) as alternatives to precious metal-based electrocatalysts is crucial in energy storage and conversion devices. Herein, we report carbon nanofiber supported NiCo nanoalloys encapsulated in a N-doped carbon, NiCo/CNF@NC catalyst, with multifunctional activities. Benefiting from the unique hybrid structure and synergistic coupling between nanoalloys and N-doped carbon which can effectively inhibit the aggregation and detachment of nanoparticles while generating additional active sites, the resultant catalyst demonstrates remarkable ORR, OER and HER performances. NiCo/CNF@NC displays ORR performance with a comparable onset potential of 1.00 V and superior operational durability than the commercial Pt/C catalyst. Additionally, the NiCo/CNF@NC catalyst exhibits OER activity with an overpotential of 0.40 V at 10 mA cm(-2) which is close to that of RuO2. The Zn-air battery based on the NiCo/CNF@NC catalyst delivers a specific capacity of 764 mA h g(Zn)(-1) with an energy density of 871 W h kg(Zn)(-1) at a current density of 20 mA cm(-2). Moreover, the electrically rechargeable Zn-air battery operates with stable cyclic performance for more than 130 cycles. The water splitting device made of symmetric NiCo/CNF@NC catalyst coated nickel foam (NiCo/CNF@NC/NiF) electrodes has demonstrated an overall water splitting performance of 1.54 V at 10 mA cm(-2) at a high catalyst loading of 4.6 mg cm(-2).
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