Real-time imaging of Na+ reversible intercalation in "Janus" graphene stacks for battery applications
Artikel i vetenskaplig tidskrift, 2021
Sodium, in contrast to other metals, cannot intercalate in graphite, hindering the use of this cheap, abundant element in rechargeable batteries. Here, we report a nanometric graphite-like anode for Na+ storage, formed by stacked graphene sheets functionalized only on one side, termed Janus graphene. The asymmetric functionalization allows reversible intercalation of Na+, as monitored by operando Raman spectroelectrochemistry and visualized by imaging ellipsometry. Our Janus graphene has uniform pore size, controllable functionalization density, and few edges; it can store Na+ differently from graphite and stacked graphene. Density functional theory calculations demonstrate that Na+ preferably rests close to -NH2 group forming synergic ionic bonds to graphene, making the interaction process energetically favorable. The estimated sodium storage up to C6.9Na is comparable to graphite for standard lithium ion batteries. Given such encouraging Na+ reversible intercalation behavior, our approach provides a way to design carbon-based materials for sodium ion batteries.
Författare
Jinhua Sun
Chalmers, Industri- och materialvetenskap, Material och tillverkning
Matthew Sadd
Chalmers, Fysik, Materialfysik
Philip Edenborg
Chalmers, Fysik, Kemisk fysik
Kompetenscentrum katalys
Henrik Grönbeck
Kompetenscentrum katalys
Chalmers, Fysik, Kemisk fysik
Peter H. Thiesen
Accurion
Zhenyuan Xia
Chalmers, Industri- och materialvetenskap, Material och tillverkning
Vanesa Quintano
Consiglio Nazionale delle Ricerche (CNR)
Ren Qiu
Chalmers, Fysik, Mikrostrukturfysik
Aleksandar Matic
Chalmers, Fysik, Materialfysik
2D-Tech
Vincenzo Palermo
Consiglio Nazionale delle Ricerche (CNR)
2D-Tech
Chalmers, Industri- och materialvetenskap, Material och tillverkning
Science advances
2375-2548 (eISSN)
Vol. 7 22 eabf0812Janus-like, Asymmetric graphene Nanosheets for Ultrafiltration and Sieving.
Vetenskapsrådet (VR) (2017-04456), 2018-01-01 -- 2021-12-31.
Graphene Core Project 3 (Graphene Flagship)
Europeiska kommissionen (EU) (EC/H2020/881603), 2020-04-01 -- 2023-03-31.
Ämneskategorier
Oorganisk kemi
Materialkemi
Teoretisk kemi
DOI
10.1126/sciadv.abf0812
PubMed
34049889