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 (KCK)

Henrik Grönbeck

Chalmers, Fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

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

Vincenzo Palermo

Consiglio Nazionale delle Ricerche (CNR)

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Science advances

2375-2548 (eISSN)

Vol. 7 22 eabf0812

Graphene Core Project 3 (Graphene Flagship)

Europeiska kommissionen (EU) (881603GrapheneCore3), 2020-04-01 -- 2023-03-31.

Janus-like, Asymmetric graphene Nanosheets for Ultrafiltration and Sieving.

Vetenskapsrådet (VR) (2017-04456), 2018-01-01 -- 2021-12-31.

Ämneskategorier

Oorganisk kemi

Materialkemi

Teoretisk kemi

DOI

10.1126/sciadv.abf0812

PubMed

34049889

Mer information

Senast uppdaterat

2021-06-11