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Necklace-like Multishelled Hollow Spinel Oxides with Oxygen Vacancies for Efficient Water Electrolysis

Journal Article


Abstract


  • The durability and reactivity of catalysts can be effectively and precisely controlled through the careful design and engineering of their surface structures and morphologies. Herein, we develop a novel "adsorption-calcination-reduction" strategy to synthesize spinel transitional metal oxides with a unique necklace-like multishelled hollow structure exploiting sacrificial templates of carbonaceous microspheres, including NiCo2O4(NCO), CoMn2O4, and NiMn2O4. Importantly, benefiting from the unique structures and reduction treatment to offer rich oxygen vacancies, the unique reduced NCO (R-NCO) as a bifunctional electrocatalyst exhibits the dual characteristics of good stability as well as high electrocatalytic activity for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). At 1.61 V cell voltage, a 10 mA cm-2water splitting current density is obtained from the dual-electrode, alkaline water electrolyzer. Calculations based on density functional theory (DFT) reveal a mechanism for the promotion of the catalytic reactions based on a decrease in the energy barrier for the formation of intermediates resulting from the introduction of oxygen vacancies through the reduction process. This method could prove to be an effective general strategy for the preparation of complex, hollow structures and functionalities.

Authors


  •   Hu, Zhe (external author)
  •   Peng, Shengjie (external author)
  •   Gong, Feng (external author)
  •   Li, Linlin (external author)
  •   Yu, Deshuang (external author)
  •   Ji, Dongxiao (external author)
  •   Zhang, Tianran (external author)
  •   Zhang, Zhiqiang (external author)
  •   Chou, Shulei
  •   Du, Yonghua (external author)
  •   Ramakrishna, Seeram (external author)

Publication Date


  • 2018

Citation


  • Peng, S., Gong, F., Li, L., Yu, D., Ji, D., Zhang, T., Hu, Z., Zhang, Z., Chou, S., Du, Y. & Ramakrishna, S. (2018). Necklace-like Multishelled Hollow Spinel Oxides with Oxygen Vacancies for Efficient Water Electrolysis. Journal of the American Chemical Society, 140 (42), 13644-13653.

Scopus Eid


  • 2-s2.0-85054259925

Number Of Pages


  • 9

Start Page


  • 13644

End Page


  • 13653

Volume


  • 140

Issue


  • 42

Place Of Publication


  • United States

Abstract


  • The durability and reactivity of catalysts can be effectively and precisely controlled through the careful design and engineering of their surface structures and morphologies. Herein, we develop a novel "adsorption-calcination-reduction" strategy to synthesize spinel transitional metal oxides with a unique necklace-like multishelled hollow structure exploiting sacrificial templates of carbonaceous microspheres, including NiCo2O4(NCO), CoMn2O4, and NiMn2O4. Importantly, benefiting from the unique structures and reduction treatment to offer rich oxygen vacancies, the unique reduced NCO (R-NCO) as a bifunctional electrocatalyst exhibits the dual characteristics of good stability as well as high electrocatalytic activity for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). At 1.61 V cell voltage, a 10 mA cm-2water splitting current density is obtained from the dual-electrode, alkaline water electrolyzer. Calculations based on density functional theory (DFT) reveal a mechanism for the promotion of the catalytic reactions based on a decrease in the energy barrier for the formation of intermediates resulting from the introduction of oxygen vacancies through the reduction process. This method could prove to be an effective general strategy for the preparation of complex, hollow structures and functionalities.

Authors


  •   Hu, Zhe (external author)
  •   Peng, Shengjie (external author)
  •   Gong, Feng (external author)
  •   Li, Linlin (external author)
  •   Yu, Deshuang (external author)
  •   Ji, Dongxiao (external author)
  •   Zhang, Tianran (external author)
  •   Zhang, Zhiqiang (external author)
  •   Chou, Shulei
  •   Du, Yonghua (external author)
  •   Ramakrishna, Seeram (external author)

Publication Date


  • 2018

Citation


  • Peng, S., Gong, F., Li, L., Yu, D., Ji, D., Zhang, T., Hu, Z., Zhang, Z., Chou, S., Du, Y. & Ramakrishna, S. (2018). Necklace-like Multishelled Hollow Spinel Oxides with Oxygen Vacancies for Efficient Water Electrolysis. Journal of the American Chemical Society, 140 (42), 13644-13653.

Scopus Eid


  • 2-s2.0-85054259925

Number Of Pages


  • 9

Start Page


  • 13644

End Page


  • 13653

Volume


  • 140

Issue


  • 42

Place Of Publication


  • United States