期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 313, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121458
关键词
Ionomer-free integrated electrodes; 1T-2H heterophase; Defect-richMoS(2) nanosheets; Hydrogen evolution reaction; PEM water electrolysis
资金
- U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under the Fuel Cell Technologies Office [DE-EE0008426, DE-EE0008423]
- National Energy Technology Laboratory [DE-FE0011585]
- Center for Nanophase Materials Sciences (CNMS)
In this study, a scalable hydrothermal approach was developed to fabricate MoS2-based electrodes with engineered 1T-2H heterophase and defect-rich MoS2 nanosheets, which significantly improved the mass activity and stability of the electrode. This work provides a promising direction for improving the catalytic activity, electrode conductivity, and stability in practical proton exchange membrane water electrolysis.
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 het-erophase and defect-rich MoS2 nanosheets (MoS(2)NSs) in-situ grown onto the carbon fiber paper (CFP). With an ultralow loading of 0.14 mg/cm(2), a small voltage of 2.25 V was obtained at 2000 mA/cm(2) 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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