Volume 136, Issue 48 e202414984
Forschungsartikel

Horizontal Transport in Ti3C2Tx MXene for Highly Efficient Osmotic Energy Conversion from Saline-Alkali Environments

Han Qian

Han Qian

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400 People's Republic of China

School of Nanoscience and Engineering, University of Chinese Academy of Sciences, Beijing, 100049 People's Republic of China

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Puguang Peng

Puguang Peng

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400 People's Republic of China

School of Nanoscience and Engineering, University of Chinese Academy of Sciences, Beijing, 100049 People's Republic of China

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Hongzhao Fan

Hongzhao Fan

Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, People's Republic of China

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Zhe Yang

Zhe Yang

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400 People's Republic of China

School of Nanoscience and Engineering, University of Chinese Academy of Sciences, Beijing, 100049 People's Republic of China

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Lixue Yang

Lixue Yang

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400 People's Republic of China

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Prof. Yanguang Zhou

Prof. Yanguang Zhou

Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, People's Republic of China

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Prof. Dan Tan

Prof. Dan Tan

School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, 710126 People's Republic of China

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Feiyao Yang

Feiyao Yang

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400 People's Republic of China

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Prof. Morten Willatzen

Prof. Morten Willatzen

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400 People's Republic of China

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Prof. Gehan Amaratunga

Corresponding Author

Prof. Gehan Amaratunga

Zhejiang University—University of Illinois at Urbana Champagne Institute (ZJUI) and School of Information Science and Electronics, Zhejiang University International Campus, Haining, China

Electrical Engineering Division, Dept. of Engineering, University of Cambridge, Cambridge, CB3 0FA UK

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Prof. Zhonglin Wang

Corresponding Author

Prof. Zhonglin Wang

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400 People's Republic of China

School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332 USA

Beijing Key Laboratory of Micro-Nano Energy and Sensor, Center for High-Entropy Energy and Systems, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400 People's Republic of China

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Prof. Di Wei

Corresponding Author

Prof. Di Wei

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400 People's Republic of China

Centre for Photonic Devices and Sensors, University of Cambridge, 9 JJ Thomson Avenue, Cambridge, CB3 0FA UK

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First published: 15 August 2024

Abstract

Osmotic energy from the ocean has been thoroughly studied, but that from saline-alkali lakes is constrained by the ion-exchange membranes due to the trade-off between permeability and selectivity, stemming from the unfavorable structure of nanoconfined channels, pH tolerance, and chemical stability of the membranes. Inspired by the rapid water transport in xylem conduit structures, we propose a horizontal transport MXene (H-MXene) with ionic sequential transport nanochannels, designed to endure extreme saline-alkali conditions while enhancing ion selectivity and permeability. The H-MXene demonstrates superior ion conductivity of 20.67 S m−1 in 1 M NaCl solution and a diffusion current density of 308 A m−2 at a 10-fold salinity gradient of NaCl solution, significantly outperforming the conventional vertical transport MXene (V-MXene). Both experimental and simulation studies have confirmed that H-MXene represents a novel approach to circumventing the permeability-selectivity trade-off. Moreover, it exhibits efficient ion transport capabilities, addressing the gap in saline-alkali osmotic power generation.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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