Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 34, Pages 28394-28405Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b06384
Keywords
hydrogen evolution reaction; Co9S8/N-doped carbon@MoS2; polyhedrons; zeolitic imidazolate framework; synergistic effect; electrocatalysts
Funding
- National Natural Science Foundation of China [21676057]
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The development of highly active and stable earth abundant electrocatalysts to reduce or eliminate the reliance on noble metal based ones for hydrogen evolution reaction (HER) over a broad pH range remains a great challenge. Herein, hierarchical porous Co9S8/N-doped carbon@MoS, (Co9S8/NC@MoS2) polyhedrons have been synthesized by a facile hydrothermal approach using highly conductive Co/NC polyhedrons composed of cobalt nanoparticles embedded in N doped carbon matrices as both the structural support and cobalt source. The Co/NC polyhedrons were prepared by direct carbonization of Co based zeolitic imidazolate framework (ZIF-67) in Ar atmosphere. Benefiting from the prominent synergistic effect of N-doped carbon enhancing the conductivity of the hybrid, MoS2 and Co9S8 providing abundant catalytically active sites as well as the well-defined polyhedral structure promoting mechanical stability, the as-synthesized Co9S8/NC@MoS2 shows excellent HER activity and good stability over a broad pH range, with onset overpotentials of 4, 38, and 45 mV, Tafel slopes of 60.3, 68.8, and 126.1 mV dec(-1), and overpotentials of 67, 117, and 261 mV at 10 mA cm(-2) in 1.0 M KOH, 0.5 M H2SO4, and 1.0 M phosphate buffer solution (PBS), respectively. This work provides a general and promising approach for the design and synthesis of inexpensive and efficient pH-universal HER electrocatalysts.
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