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Ti₃C₂ MXene-based Schottky Photocathode for Enhanced Photoelectrochemical Sensing

Ye, Cui and Wu, Zhen and Ma, Keyi and Xia, Zhuohao and Pan, Jun and Wang, Minqiang and Ye, Changhui (2021) Ti₃C₂ MXene-based Schottky Photocathode for Enhanced Photoelectrochemical Sensing. Journal of Alloys and Compounds, 859 . Art. No. 157787. ISSN 0925-8388.

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Nanomaterials are vital to the realization of photoelectrochemical (PEC) sensing platform that provides the sensitive detection and quantification of low-abundance biological samples. Here, this work reports a Schottky junction-based BiOI/Ti₃C₂ heterostructure, used as a photocathode for PEC bioanalysis. Specially, we realize in situ growth of flower-like BiOI on 2D intrinsically negatively charged Ti₃C₂ MXene nanosheet that endows BiOI/Ti₃C₂ heterostructure with admirably combined merits, noting in particular the generation of built-in electric field and the decrease of contact resistance between BiOI and Ti₃C₂. Under the visible light irradiation, the BiOI/Ti₃C₂ heterostructure-modified PEC platform displays superior cathodic photocurrent signal, while PEC response cuts down with the presence of L-Cysteine (L-Cys) as a representative analyte owing to the metal-S bond formation. The “signal-off” PEC sensing strategy shows good performance in terms of sensitivity, limit of detection (LOD, 0.005 nM) and stability. This research reveals the great potentials of MXene-based heterostructure in the application field of PEC sensor establishment.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ye, Cui0000-0001-7689-6825
Wang, Minqiang0000-0002-7775-8341
Ye, Changhui0000-0002-4986-530X
Alternate Title:Ti3C2 MXene-based Schottky Photocathode for Enhanced Photoelectrochemical Sensing
Additional Information:© 2020 Elsevier. Received 17 June 2020, Revised 27 October 2020, Accepted 29 October 2020, Available online 5 November 2020. This work was supported by the National Natural Science Foundation of China (Grant No. 21904116). The authors are grateful to Prof. Changhui Ye (Deceased on Nov 1 2019) for assistance. CRediT authorship contribution statement: Cui Ye: Writing - review & editing, Funding acquisition, Supervision. Zhen Wu: Writing - original draft, Data curation. Keyi Ma: Writing - original draft, Data curation. Zhuohao Xia: Writing - original draft, Data curation. Jun Pan: Formal analysis. Minqiang Wang: Writing - review & editing, Formal analysis. Changhui Ye: Funding acquisition. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funding AgencyGrant Number
National Natural Science Foundation of China21904116
Subject Keywords:Ti₃C₂ MXene; Photoelectrochemical Sensing; Schottky Junction; L-Cysteine
Record Number:CaltechAUTHORS:20201105-152206659
Persistent URL:
Official Citation:Cui Ye, Zhen Wu, Keyi Ma, Zhuohao Xia, Jun Pan, Minqiang Wang, Changhui Ye, Ti3C2 MXene-based Schottky photocathode for enhanced photoelectrochemical sensing, Journal of Alloys and Compounds, Volume 859, 2021, 157787, ISSN 0925-8388, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106462
Deposited By: George Porter
Deposited On:06 Nov 2020 15:47
Last Modified:29 Jan 2021 18:58

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