Two-dimensional vanadium sulfide flexible graphite/polymer films for near-infrared photoelectrocatalysis and electrochemical energy storage

Siowwoon Ng, Kalyan Ghosh, Jan Vyskocil, Martin Pumera

Research output: Contribution to journalArticlepeer-review

Abstract

Modern wearable electronics require scalable, flexible, and conductive electrodes with tunable properties. Abundant materials such as graphite as a conductive component and polymer as a flexible component forming a composite film (electrode) via simple synthesis technique are particularly captivating. This approach conveniently satisfies the fundamental needs of an ideal electrode yet provides a conductive platform to accommodate a secondary material for various purposes in electrochemical energy conversion and storage. Accordingly, we optimize a graphite-polymer composite film with good conductivity and flexibility to incorporate two-dimensional (2D) VSx (mixed phase predominated by V5S8) as an active material within the film. We exemplify the dual functionalities of the VSx/graphite flexible electrode as i) a photo-electrocatalyst for enhanced hydrogen evolution reaction by visible and near-infrared light irradiation (overpotential ≈500 mV at the current density of −10 mA cm−2), and ii) a conductive electrode for symmetrical solid-state supercapacitor with pseudocapacitive charge storage mechanism (areal capacitance of 123 mF cm−2 and areal capacity of 34 µAh cm−2 at the current density of 0.5 mA cm−2). Our work demonstrates the versatility of graphite films in terms of size, shape, flexibility, and scalability, with tunable physical, optical, and electrical properties by integrating other secondary materials. We combine flexible graphite film and 2D vanadium sulfide with near-infrared photoresponse and pseudocapacitive properties, as an economically feasible avenue for energy harvesting, outer space application, and wearable devices.

Original languageEnglish
Article number135131
JournalChemical Engineering Journal
Volume435
DOIs
Publication statusPublished - 2022 May 1

Bibliographical note

Funding Information:
KG acknowledges the funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement (No. 894457—MotionESt). J.V.was supported by the project Advanced Functional Nanorobots (reg. No. CZ.02.1.01/0.0/0.0/15_003/0000444 financed by the EFRR). SN and KG thank CzechNanoLab project LM2018110 funded by MEYS CR for material characterizations at CEITEC Nano Research Infrastructure. M.P. acknowledge the financial support by the Grant Agency of the Czech Republic (19-26896X). We thank Dr. Jayraj V. Vaghasiya for BET measurement, Dr. Ondřej Man and Ms. Katarina Novčić for technical assistance with STEM and CLSM imaging, respectively.

Funding Information:
KG acknowledges the funding from the European Union's Horizon 2020 research and innovation program under the Marie Sk?odowska-Curie grant agreement (No. 894457?MotionESt). J.V.was supported by the project Advanced Functional Nanorobots (reg. No. CZ.02.1.01/0.0/0.0/15_003/0000444 financed by the EFRR). SN and KG thank CzechNanoLab project LM2018110 funded by MEYS CR for material characterizations at CEITEC Nano Research Infrastructure. M.P. acknowledge the financial support by the Grant Agency of the Czech Republic (19-26896X). We thank Dr. Jayraj V. Vaghasiya for BET measurement, Dr. Ond?ej Man and Ms. Katarina Nov?i? for technical assistance with STEM and CLSM imaging, respectively.

Publisher Copyright:
© 2022 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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