MoS2 nanosheet integrated electrodes with engineered 1T-2H phases and defects for efficient hydrogen production in practical PEM electrolysis

Zhiqiang Xie; Shule Yu; Xiaohan Ma; Kui Li; Lei Ding; Weitian Wang; David A. Cullen; Harry M. Meyer; Haoran Yu; Jianhua Tong; Zili Wu; Feng Yuan Zhang

doi:10.1016/j.apcatb.2022.121458

MoS₂ nanosheet integrated electrodes with engineered 1T-2H phases and defects for efficient hydrogen production in practical PEM electrolysis

Zhiqiang Xie, Shule Yu, Xiaohan Ma, Kui Li, Lei Ding, Weitian Wang, David A. Cullen, Harry M. Meyer, Haoran Yu, Jianhua Tong, Zili Wu, Feng Yuan Zhang

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

Low electrical conductivity and poor accessibility of MoS₂ reaction sites raise great challenges in maximizing the triple-phase-boundary (TPB) sites of MoS₂-based electrodes and minimizing ohmic losses for efficient hydrogen evolution reaction (HER) in practical proton exchange membrane (PEM) water electrolysis. Herein, we report a scalable hydrothermal approach to fabricate ionomer-free integrated electrodes with engineered 1 T-2 H heterophase and defect-rich MoS₂ nanosheets (MoS₂NSs) in-situ grown onto the carbon fiber paper (CFP). With an ultralow loading of 0.14 mg/cm², a small voltage of 2.25 V was obtained at 2000 mA/cm² in a practical cell with Nafion115 membrane, which outperforms all previously reported high-loading non-precious catalyst-based electrodes. Impressively, it shows 44 times higher mass activity than a high-loading and ionomer-mixed MoS₂ assemblies electrode. This work builds a bridge from catalyst optimization to electrode fabrication and provides a promising direction for improving intrinsic catalytic activity, electrode conductivity and stability for practical PEM water electrolysis.

Original language	English
Article number	121458
Journal	Applied Catalysis B: Environmental
Volume	313
DOIs	https://doi.org/10.1016/j.apcatb.2022.121458
State	Published - Sep 15 2022

Funding

The authors greatly appreciate the support from U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Fuel Cell Technologies Office Award Number DE-EE0008426 and DE-EE0008423 and National Energy Technology Laboratory under Award DE-FE0011585 . A portion of the research including the synthesis, Raman and STEM was supported by the Center for Nanophase Materials Sciences (CNMS), which is a US Department of Energy, Office of Science User Facility at Oak Ridge National Laboratory. The authors also would like to appreciate Dr. Zhenghong Bao, Dr. Scott T. Retterer, Dale Hensley, Dayrl Briggs, Alexander Terekhov, Douglas Warnberg, and Dr. Brian Canfield for their help.

Keywords

1T-2H heterophase
Defect-rich MoS nanosheets
Hydrogen evolution reaction
Ionomer-free integrated electrodes
PEM water electrolysis

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.apcatb.2022.121458

Cite this

Xie, Z., Yu, S., Ma, X., Li, K., Ding, L., Wang, W., Cullen, D. A., Meyer, H. M., Yu, H., Tong, J., Wu, Z., & Zhang, F. Y. (2022). MoS₂ nanosheet integrated electrodes with engineered 1T-2H phases and defects for efficient hydrogen production in practical PEM electrolysis. Applied Catalysis B: Environmental, 313, Article 121458. https://doi.org/10.1016/j.apcatb.2022.121458

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abstract = "Low electrical conductivity and poor accessibility of MoS2 reaction sites raise great challenges in maximizing the triple-phase-boundary (TPB) sites of MoS2-based electrodes and minimizing ohmic losses for efficient hydrogen evolution reaction (HER) in practical proton exchange membrane (PEM) water electrolysis. Herein, we report a scalable hydrothermal approach to fabricate ionomer-free integrated electrodes with engineered 1 T-2 H heterophase and defect-rich MoS2 nanosheets (MoS2NSs) in-situ grown onto the carbon fiber paper (CFP). With an ultralow loading of 0.14 mg/cm2, a small voltage of 2.25 V was obtained at 2000 mA/cm2 in a practical cell with Nafion115 membrane, which outperforms all previously reported high-loading non-precious catalyst-based electrodes. Impressively, it shows 44 times higher mass activity than a high-loading and ionomer-mixed MoS2 assemblies electrode. This work builds a bridge from catalyst optimization to electrode fabrication and provides a promising direction for improving intrinsic catalytic activity, electrode conductivity and stability for practical PEM water electrolysis.",

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AU - Ding, Lei

AU - Wang, Weitian

AU - Cullen, David A.

AU - Meyer, Harry M.

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