Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.2c04453
Keywords
porous carbon nanofibers; single-atom catalysts; Fe-N-5 moiety; hydrogen evolution reaction; electrospinning
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Funding
- National Natural Science Foundation of China [51901055]
- Natural Science Foundation of Heilongjiang Province [LH2019E025]
- Fundamental Research Funds of the Central University [3072022TS1008]
- China Postdoctoral Science Foundation [2019M651260, 2020T130139]
- Heilongjiang Postdoctoral Fund [LBH-Z19009]
- Heilongjiang Touyan Innovation Team Program
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This study developed a strategy of N-coordination to disperse Fe-N-5 sites on N-doped porous nanofibers as an efficient HER catalyst. The results showed that Fe species existed as dispersed single atoms with strong binding to N atoms, forming the coordination structure of Fe-N-5. Fe SA/PNCNFs-0.1 exhibited superior HER performance and durability in both acidic and alkaline media.
Atomically dispersed electrocatalysts are a major focus of chemical and energy conversion, while the structure and hydrogen evolution reaction (HER) performance affected by single atoms loading need to be further explored. Herein, we developed an N-coordination strategy to design Fe-N-5 sites distributed on N-doped porous nanofibers (Fe SA/PNCNFs-0.1) as an efficient HER catalyst by the wet impregnation method. The results show that Fe species exist in the form of dispersed single atoms. The binding between the Fe atom and N atom is strong, forming the coordination structure of Fe-N-5. In the acidic HER, Fe SA/PNCNFs-0.1 improves the catalytic performance toward the HER with a small overpotential of 44.3 mV at 10 mA cm(-2) current density and a low Tafel slope of 45.4 mV dec(-1), which are superior to those of Fe single atoms with less Fe contents (Fe SA/PNCNFs-0.4) and Fe nanoparticles (Fe NP/PNCNFs). Fe SA/PNCNFs-0.1 also has excellent HER activity and durability in alkaline media, highlighting the potential application of Fe single atoms for hydrogen production.
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