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Elaborately assembled core-shell structured metal sulfides as a bifunctional catalyst for highly efficient electrochemical overall water splitting

Journal Article


Abstract


  • Low efficiency, short lifetimes, and limited kinds of catalysts are still three fundamental shortcomings that have plagued electrochemical water splitting. Herein, we rationally synthesized a cost-effective Co 3 S 4 @MoS 2 hetero-structured catalyst that has proven to be a highly active and stable bifunctional catalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline environment. The heterostructure was obtained via a first hydrothermal approach to obtain hollow Co 3 S 4 nanoboxes based on the ionic exchange reaction between Fe(CN) 6 3− of Co-Fe Prussian blue analogue (PBA) and S 2− at 120 °C, and the subsequent in situ growth of MoS 2 nanosheets on the surface of Co 3 S 4 nanoboxes at an elevated temperature of 200 °C. The synergistic effects between the active and stable HER catalyst of MoS 2 and the efficient OER catalyst of Co 3 S 4 , as well as the morphological superiority of hollow and core-shell structures, endow Co 3 S 4 @MoS 2 with remarkable electrocatalytic performance and robust durability toward overall water splitting. As a result, the designed non-noble electrocatalyst of Co 3 S 4 @MoS 2 exhibits a low overpotential of 280 mV for OER and 136 mV for HER at a current density of 10 mA cm −2 in an alkaline solution. Meanwhile, a low cell voltage of 1.58 V is achieved by using the heterostructure as both anode and cathode catalysts. This work paves the way to the design and construction of other prominent electrocatalysts for overall water splitting.

Authors


  •   Guo, Yanna (external author)
  •   Tang, Jing (external author)
  •   Wang, Zhongli (external author)
  •   Kang, Yong-Mook (external author)
  •   Bando, Yoshio
  •   Yamauchi, Yusuke (external author)

Publication Date


  • 2018

Citation


  • Guo, Y., Tang, J., Wang, Z., Kang, Y., Bando, Y. & Yamauchi, Y. (2018). Elaborately assembled core-shell structured metal sulfides as a bifunctional catalyst for highly efficient electrochemical overall water splitting. Nano Energy, 47 494-502.

Scopus Eid


  • 2-s2.0-85044080786

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3011

Number Of Pages


  • 8

Start Page


  • 494

End Page


  • 502

Volume


  • 47

Place Of Publication


  • Netherlands

Abstract


  • Low efficiency, short lifetimes, and limited kinds of catalysts are still three fundamental shortcomings that have plagued electrochemical water splitting. Herein, we rationally synthesized a cost-effective Co 3 S 4 @MoS 2 hetero-structured catalyst that has proven to be a highly active and stable bifunctional catalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline environment. The heterostructure was obtained via a first hydrothermal approach to obtain hollow Co 3 S 4 nanoboxes based on the ionic exchange reaction between Fe(CN) 6 3− of Co-Fe Prussian blue analogue (PBA) and S 2− at 120 °C, and the subsequent in situ growth of MoS 2 nanosheets on the surface of Co 3 S 4 nanoboxes at an elevated temperature of 200 °C. The synergistic effects between the active and stable HER catalyst of MoS 2 and the efficient OER catalyst of Co 3 S 4 , as well as the morphological superiority of hollow and core-shell structures, endow Co 3 S 4 @MoS 2 with remarkable electrocatalytic performance and robust durability toward overall water splitting. As a result, the designed non-noble electrocatalyst of Co 3 S 4 @MoS 2 exhibits a low overpotential of 280 mV for OER and 136 mV for HER at a current density of 10 mA cm −2 in an alkaline solution. Meanwhile, a low cell voltage of 1.58 V is achieved by using the heterostructure as both anode and cathode catalysts. This work paves the way to the design and construction of other prominent electrocatalysts for overall water splitting.

Authors


  •   Guo, Yanna (external author)
  •   Tang, Jing (external author)
  •   Wang, Zhongli (external author)
  •   Kang, Yong-Mook (external author)
  •   Bando, Yoshio
  •   Yamauchi, Yusuke (external author)

Publication Date


  • 2018

Citation


  • Guo, Y., Tang, J., Wang, Z., Kang, Y., Bando, Y. & Yamauchi, Y. (2018). Elaborately assembled core-shell structured metal sulfides as a bifunctional catalyst for highly efficient electrochemical overall water splitting. Nano Energy, 47 494-502.

Scopus Eid


  • 2-s2.0-85044080786

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3011

Number Of Pages


  • 8

Start Page


  • 494

End Page


  • 502

Volume


  • 47

Place Of Publication


  • Netherlands