Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 18, Pages 15278-15288Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b02426
Keywords
CoFe-layered double hydroxide; reactive multifunctional template; N-doped carbon nanosheet; oxygen reduction; water splitting
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Funding
- National Key Technology RAMP
- D Program of China [2017YFB0310704]
- National Science Foundation of China [21773112, 21173119, 21273109]
- Fundamental Research Funds for the Central Universities
- Hubei Key Laboratory for Processing and Application of Catalytic Materials [CH201401]
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The increasing need for clean and sustainable energy inspires researchers to explore low-cost nonprecious metal electrocatalysts for advanced energy storage and conversion. Herein, we develop a reactive template route to fabricate a high-efficiency oxygen reduction reaction (ORR)/ oxygen evolution reaction (OER)/hydrogen evolution reaction (HER) trifunctional electrocatalyst (CoFe/N-H-C NS) via pyrolyzing the mixture containing CoFe-layered double hydroxide@glucosaminoglycan (CoFe-LDH@p-Glu) and urea/dicyandiamide. In this strategy, the CoFe-LDH not only provides a well-defined two-dimensional template to form carbon NSs but also employs a well-distributed CoFe precursor to form uniform CoFe nanoparticles (NPs). Such a synthetic strategy has been demonstrated effective to controllably fabricate the special nanostructure with metal NPs embedded in N-doped carbon NSs and favorable exposure of active sites, leading to a strong synergistic effect between CoFe and N-doped carbon NSs and abundant electrocatalytic active sites for energy electrocatalysis. CoFe/N-H-C NS exhibits superior ORR performances to Pt/C with more positive half-wave potential (844 mV for CoFe/N-H-C NS vs 832 mV for Pt/C), longer stability, and better methanol tolerance in alkaline conditions. Furthermore, CoFe/N-H-C NS displays an identical current density to commercial RuO2 at 1.8 V (vs RHE) toward OER and a remarkable electrocatalytic property toward HER in alkaline conditions. This work presents fresh strategies for the design and fabrication of high-performance carbon-based energy materials.
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