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Hexagonal-Phase Cobalt Monophosphosulfide for Highly Efficient Overall Water Splitting.

Zhengfei Dai1, Hongbo Geng1, Jiong Wang

  • 1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an, Shaanxi 710049, People's Republic of China.

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|October 28, 2017
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Summary

Researchers developed a novel cobalt monophosphosulfide catalyst for efficient water splitting, crucial for the hydrogen economy. This nonprecious material shows high stability and activity for both oxygen and hydrogen evolution reactions.

Keywords:
electrocatalystshydrogen evolution reactionmetal monophosphosulfidesoxygen evolution reactionyolk−shell

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing nonprecious, efficient, and stable electrocatalysts is vital for the hydrogen economy.
  • Precious noble metals are currently dominant but costly.

Purpose of the Study:

  • To synthesize a novel cobalt monophosphosulfide material for electrocatalytic water splitting.
  • To investigate the effect of sulfurization and phosphorization on catalyst performance.

Main Methods:

  • A partial sulfurization/phosphorization strategy was employed to create a nonstoichiometric pyrrhotite-type cobalt monophosphosulfide (Co0.9S0.58P0.42).
  • The P/S atomic ratio was tuned by regulating the degree of sulfurization.
  • Electrocatalytic activity for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) was evaluated.

Main Results:

  • The synthesized Co0.9S0.58P0.42 material exhibited a hexagonal close-packed phase and yolk-shell spherical morphology.
  • For OER, it showed a low overpotential of 266 mV at 10 mA cm-2 and a Tafel slope of 48 mV dec-1 with high stability.
  • For overall water splitting, a low overpotential of 1.59 V at 10 mA cm-2 and good stability were achieved.

Conclusions:

  • Phase engineering and composition control are effective strategies for activating Co3+/Co2+ couples and tuning electronic structures.
  • The developed cobalt monophosphosulfide is a promising nonprecious electrocatalyst for water splitting.
  • The proposed synthesis strategy enables the rational design of transition metal monophosphosulfides for electrochemical applications.