Suppressing Mo‐Species Leaching in MoOx/A‐Ni3S2 Cathode for Stable Anion Exchange Membrane Water Electrolysis at Industrial‐Scale Current Density
Abstract The development of non‐noble metal‐based hydrogen evolving reaction (HER) electrocatalysts operating under high current density plays a critical role in the large‐scale application of anion exchange membrane water electrolysis (AEM‐WE). Herein, a porous and hybrid MoS2/Ni3S2 is synthesized...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-07-01
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| Series: | Advanced Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/advs.202502478 |
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| Summary: | Abstract The development of non‐noble metal‐based hydrogen evolving reaction (HER) electrocatalysts operating under high current density plays a critical role in the large‐scale application of anion exchange membrane water electrolysis (AEM‐WE). Herein, a porous and hybrid MoS2/Ni3S2 is synthesized on nickel foam (NF) via a one‐step hydrothermal method and studied its reconstruction process during alkaline HER conditions. Experimental results indicated that the MoS2 underwent an oxidative dissolution followed by a dynamic equilibrium between dissolution and redeposition of the amorphous MoOx during HER. Meanwhile, S‐vacancy‐rich Ni3S2 (A‐Ni3S2) is exposed and acts as the real active site for HER. The obtained MoOx/A‐Ni3S2 catalyst exhibited high catalytic performance in three‐electrode systems and single‐cell AEM‐WE. Finally, for a long‐term durability test in the AEM electrolyzer, a dry cathode method is applied to suppress the Mo species leaching from the MoOx/A‐Ni3S2 electrode. Remarkably, the device assembled by MoOx/A‐Ni3S2 as the cathode catalyst and NiFe as the anode catalyst demonstrated a high stability of 2500 h at 2 A cm−2 and 40 °C with a small aging rate of 30 µV h−1. |
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| ISSN: | 2198-3844 |