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Biomorphic CoNC/CoOx Composite Derived from Natural Chloroplasts as Efficient Electrocatalyst for Oxygen Reduction Reaction

Guo, Xingmei ; Qian, Cheng ; Shi, Ruhua ; Zhang, Wei ; Xu, Fei ; Qian, Silu ; Zhang, Junhao ; Yang, Hongxun ; Yuan, Aihua ; Fan, Tongxiang

Small (Weinheim an der Bergstrasse, Germany), 2019-02, Vol.15 (8), p.e1804855-n/a [Periódico revisado por pares]

Weinheim: Wiley Subscription Services, Inc

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  • Título:
    Biomorphic CoNC/CoOx Composite Derived from Natural Chloroplasts as Efficient Electrocatalyst for Oxygen Reduction Reaction
  • Autor: Guo, Xingmei ; Qian, Cheng ; Shi, Ruhua ; Zhang, Wei ; Xu, Fei ; Qian, Silu ; Zhang, Junhao ; Yang, Hongxun ; Yuan, Aihua ; Fan, Tongxiang
  • Assuntos: biomorphic materials ; Chlorophyll ; Chloroplasts ; Cobalt oxides ; Computer architecture ; CoOx ; CoNC ; Electrocatalysts ; Hydrochloric acid ; Magnesium ; metal porphyrins ; Nanotechnology ; Nitrogen ; oxygen reduction reaction ; Oxygen reduction reactions ; Synergistic effect
  • É parte de: Small (Weinheim an der Bergstrasse, Germany), 2019-02, Vol.15 (8), p.e1804855-n/a
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Natural chloroplasts containing big amounts of chlorophylls (magnesium porphyrin, Mg‐Chl) are employed both as template and porphyrin source to synthesize biomorphic CoNC/CoOx composite as electrocatalyst for the oxygen reduction reaction (ORR). Cobalt‐substituted chlorophyll derivative (Co‐Chl) in chloroplasts is first obtained by successively rinsing in hydrochloric acid and cobalt acetate solutions. After calcining in nitrogen to 800 °C, Co‐Chl is transferred to CoNC; while other parts of chloroplasts adsorbed with Co ions are transferred to CoOx retaining the microarchitecture of chloroplasts. The abundant active CoNC sites are protected by circumjacent biocarbon and CoOx to avoid leakage and agglomeration, and at the same time can overcome the poor conductivity weakness of CoOx by directly transporting electrons to the carbonaceous skeleton. This unique synergistic effect, together with efficient bioarchitecture, leads to good electrocatalytical performance for the ORR. The onset and half‐wave potentials are 0.89 and 0.82 V versus reversible hydrogen electrode, respectively, with better durability and methanol tolerance than that of commercial Pt/C. Different from the traditional concept of biomorphic materials which simply utilize bioarchitectures, this work provides a new example of coupling bioderivative components with bioarchitectures into one integrated system to achieve good comprehensive performance for electrocatalysts. A biomorphic CoNC/CoOx composite with microellipsoidal structure is synthesized using natural chloroplasts containing big amounts of chlorophylls both as template and porphyrin source. The unique synergistic effect between CoNC and CoOx, together with efficient bioarchitecture, leads to excellent electrocatalytical performance for the oxygen reduction reaction with both high catalytic activity and good stability.
  • Editor: Weinheim: Wiley Subscription Services, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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