Integrating PtNi nanoparticles on NiFe layered double hydroxide nanosheets as a bifunctional catalyst for hybrid sodium-air batteries

Yu, Xueqing, Kang, Yao, Wang, Shuo, Hui, Kwun San, Hui, Kwun Nam, Zhao, Huajun, Li, Jianding, Li, Bo, Xu, Jincheng, Chen, Liang and Shao, Huaiyu (2020) Integrating PtNi nanoparticles on NiFe layered double hydroxide nanosheets as a bifunctional catalyst for hybrid sodium-air batteries. Journal of Materials Chemistry A, 8 (32). pp. 16355-16365. ISSN 2050-7488

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Abstract

Hybrid sodium-air batteries (HSABs) are emerging systems for next-generation energy storage owing to their high theoretical energy density, high specific capacity, low cost, and environmental friendliness. However, the ungratified energy efficiency, large overpotential, and poor cycling stability associated with the sluggish oxygen reduction reaction/oxygen evolution reaction (ORR/OER) at air electrodes hamper their further development. Herein, we report a facile electrodeposition method to construct three-dimensional nickel defect-rich nickel-iron layered double hydroxide nanosheets decorated with platinum-nickel alloyed nanoparticles grown on macroporous nickel foam substrates (PtNi/NixFe LDHs) as a binder-free electrocatalyst. The optimal catalyst (Pt3Ni1/NixFe LDHs) demonstrates a low overpotential (265 mV at the current density of 10 mA cm-2), a small Tafel slope (22.2 mV dec-1) towards the OER and a high half-wave potential (0.852 V) for ORR, as well as superior long-term stability in comparison to commercial catalysts. Theoretical calculations revealed that the Ni-top site of Pt3Ni1/NixFe LDHs works as an active site for enhanced OER/ORR activities. The fabricated HSAB with Pt3Ni1/NixFe LDHs as the air cathode displayed not only an initial low overpotential gap (0.50 V) but also superior rechargeability and structure stability with high round-trip efficiency (∼79.9%) of over 300 cycles. These results provide a novel design of bifunctional and binder-free catalyst as the cathode for metal-air batteries. This journal is

Item Type: Article
Uncontrolled Keywords: chemistry(all),renewable energy, sustainability and the environment,materials science(all) ,/dk/atira/pure/subjectarea/asjc/1600
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Depositing User: LivePure Connector
Date Deposited: 19 Jan 2021 00:56
Last Modified: 12 Feb 2021 01:09
URI: https://ueaeprints.uea.ac.uk/id/eprint/78207
DOI: 10.1039/d0ta04602g

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