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Establishing reaction networks in the 16-electron sulfur reduction reaction.
Liu, Rongli; Wei, Ziyang; Peng, Lele; Zhang, Leyuan; Zohar, Arava; Schoeppner, Rachel; Wang, Peiqi; Wan, Chengzhang; Zhu, Dan; Liu, Haotian; Wang, Zhaozong; Tolbert, Sarah H; Dunn, Bruce; Huang, Yu; Sautet, Philippe; Duan, Xiangfeng.
Afiliación
  • Liu R; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
  • Wei Z; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
  • Peng L; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
  • Zhang L; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
  • Zohar A; Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA.
  • Schoeppner R; Materials Department and Materials Research Laboratory, University of California, Santa Barbara, CA, USA.
  • Wang P; California NanoSystems Institute, University of California, Santa Barbara, CA, USA.
  • Wan C; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
  • Zhu D; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
  • Liu H; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
  • Wang Z; Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA.
  • Tolbert SH; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
  • Dunn B; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
  • Huang Y; Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA.
  • Sautet P; California NanoSystems Institute, University of California, Los Angeles, CA, USA.
  • Duan X; Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA.
Nature ; 626(7997): 98-104, 2024 Feb.
Article en En | MEDLINE | ID: mdl-38297176
ABSTRACT
The sulfur reduction reaction (SRR) plays a central role in high-capacity lithium sulfur (Li-S) batteries. The SRR involves an intricate, 16-electron conversion process featuring multiple lithium polysulfide intermediates and reaction branches1-3. Establishing the complex reaction network is essential for rational tailoring of the SRR for improved Li-S batteries, but represents a daunting challenge4-6. Herein we systematically investigate the electrocatalytic SRR to decipher its network using the nitrogen, sulfur, dual-doped holey graphene framework as a model electrode to understand the role of electrocatalysts in acceleration of conversion kinetics. Combining cyclic voltammetry, in situ Raman spectroscopy and density functional theory calculations, we identify and directly profile the key intermediates (S8, Li2S8, Li2S6, Li2S4 and Li2S) at varying potentials and elucidate their conversion pathways. Li2S4 and Li2S6 were predominantly observed, in which Li2S4 represents the key electrochemical intermediate dictating the overall SRR kinetics. Li2S6, generated (consumed) through a comproportionation (disproportionation) reaction, does not directly participate in electrochemical reactions but significantly contributes to the polysulfide shuttling process. We found that the nitrogen, sulfur dual-doped holey graphene framework catalyst could help accelerate polysulfide conversion kinetics, leading to faster depletion of soluble lithium polysulfides at higher potential and hence mitigating the polysulfide shuttling effect and boosting output potential. These results highlight the electrocatalytic approach as a promising strategy for tackling the fundamental challenges regarding Li-S batteries.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido