DataVXACS Energy LettersPaper
journal article·2020-09-11Open access

Unraveling the Charge Storage Mechanism of Ti3C2Tx MXene Electrode in Acidic Electrolyte

Hui Shao, Kui Xu, Yih-Chyng Wu, Antonella Iadecola, Liyuan Liu, Hongyun Ma, Liangti Qu, Encarnacion Raymundo-Piñero, Jixin Zhu, Zifeng Lin, Pierre-Louis Taberna, Patrice Simon

ACS Energy Letters· Volume 5· Issue 9
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Source abstract

Abstract

Two-dimensional Ti3C2Tx MXenes have been extensively studied as pseudocapacitive electrode materials. This Letter aims at providing further insights into the charge storage mechanism of the Ti3C2Tx MXene electrode in the acidic electrolyte by combining experimental and simulation approaches. Our results show that the presence of H2O molecules between the MXene layers plays a critical role in the pseudocapacitive behavior, providing a pathway for proton transport to activate the redox reaction of the Ti atoms. Also, thermal annealing of the samples at different temperatures suggests that the presence of the confined H2O molecules is mainly controlled by the surface termination groups. These findings pave the way for alternative strategies to enhance the high-rate performance of MXenes electrodes by optimizing their surface termination groups.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storageMaterials processing

OpenAlex topics: MXene and MAX Phase Materials · Supercapacitor Materials and Fabrication · Advanced Memory and Neural Computing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

CIRIMAT, Université Paul Sabatier, CNRS, 31062 Toulouse, France

Réseau sur le Stockage Electrochimique de l’Energie (RS2E), FR CNRS 3459, 80039 Amiens Cedex, France

Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), Nanjing 211816, P.R. China

Department of Chemistry, Tsinghua University, Beijing 100084, P.R. China

CNRS, CEMHTI UPR3079, Université Orléans, 45071 Orléans, France

College of Materials Science and Engineering, Sichuan University, Chengdu 610065, P.R. China

Institut Universitaire de France, 75005 Paris, France

Funding

Agence Nationale de la Recherche · China Scholarship Council · Sichuan Science and Technology Program

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