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A bifunctional electrocatalyst of PtNi nanoparticles immobilized on three-dimensional carbon nanofiber mats for efficient and stable water splitting in both acid and basic media

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Abstract

Inspired by the excellent activity of platinum in hydrogen evolution reaction (HER) and the good performance of Ni-based compounds in oxygen evolution reaction (OER), a bifunctional electrocatalyst PtNi carbon nanofiber (CNF) is designed and fabricated using electrospinning followed by carbonization. Ultra-small PtNi nanoparticles of several nanometers in size are densely dispersed on every CNF, along with a few larger nanoparticles with sizes of several decades of nanometers. The as-prepared catalysts can be directly used as an electrode and act as high-efficiency materials for water splitting, including HER and OER. For HER activity, the PtNi/CNFs reach 10 mA cm−2 current density at low overpotentials of 34 mV and exhibit a small Tafel slope of 31 mV dec−1 in acidic electrolytes of 0.5 M H2SO4, which is close to that of commercial Pt/C (20 wt%) electrocatalytic catalysts. In 1 M KOH solution, the PtNi/CNFs also exhibit excellent HER activity with a low overpotential of 82 mV to achieve a current density of 10 mA cm−2 and a small Tafel slope of 34 mV dec−1. Moreover, the PtNi/CNFs also show good activity for OER in alkaline electrolyte of 1 M KOH with a Tafel slope of 159 mV dec−1 and a small overpotential of 151 mV to reach a current density of 10 mA cm−2. In addition, the OER performance of the PtNi/CNFs in acid media is also favorable, with a 198 mV dec−1 Tafel slope. The decent activity of the PtNi/CNFs for water splitting originates from the synergistic effects of using Pt and Ni, large amounts of ultra-small nanoparticles densely dispersed on the CNFs, high conductivity of the support materials and interconnected three-dimensional structures of the carbon nanofiber mats.

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Authors and Affiliations

  1. Key Laboratory of Advanced Textile Materials and Manufacturing Technology of the Ministry of Education, College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, 310018, People’s Republic of China

    Jiawei Chen, Juan Wang, Jiadong Chen & Lina Wang

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  1. Jiawei Chen
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  2. Juan Wang
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  3. Jiadong Chen
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  4. Lina Wang
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Correspondence to Lina Wang.

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Chen, J., Wang, J., Chen, J. et al. A bifunctional electrocatalyst of PtNi nanoparticles immobilized on three-dimensional carbon nanofiber mats for efficient and stable water splitting in both acid and basic media. J Mater Sci 52, 13064–13077 (2017). https://doi.org/10.1007/s10853-017-1410-1

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  • DOI: https://doi.org/10.1007/s10853-017-1410-1

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