Stacking Fault-Enriched MoNi 4 /MoO 2 Enables High-Performance Hydrogen Evolution
Producing green hydrogen in a cost-competitive manner via water electrolysis will make the long-held dream of hydrogen economy a reality. Although platinum-based catalysts show good performance towards hydrogen evolution reaction (HER), the high cost and scarce abundance challenge their economic via...
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Veröffentlicht in: | Advanced materials (Weinheim) 2024-08, Vol.36 (33), p.e2402156 |
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Sprache: | eng |
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Zusammenfassung: | Producing green hydrogen in a cost-competitive manner via water electrolysis will make the long-held dream of hydrogen economy a reality. Although platinum-based catalysts show good performance towards hydrogen evolution reaction (HER), the high cost and scarce abundance challenge their economic viability and sustainability. Here, we show a non-platinum, high-performance electrocatalyst for HER achieved by engineering high fractions of stacking fault defects for MoNi
/MoO
nanosheets (d-MoNi) through a combined chemical and thermal reduction strategy. The d-MoNi catalyst offers ultralow overpotentials of 78 and 121 mV for HER at current densities of 500 and 1000 mA cm
in 1 M KOH, respectively. The defect-rich d-MoNi exhibits 4 times higher turnover frequency than the benchmark 20% Pt/C, together with its excellent durability (>100 h), making it one of the best-performing non-platinum catalysts for HER. The experimental and theoretical results reveal that the abundant stacking faults in d-MoNi induce a compressive strain, decreasing the proton adsorption energy and promoting the associated combination of *H into hydrogen and molecular hydrogen desorption, enhancing the HER performance. This work provides a new synthetic route to engineer defective metal and metal alloy electrocatalysts for emerging electrochemical energy conversion and storage applications. This article is protected by copyright. All rights reserved. |
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ISSN: | 0935-9648 1521-4095 |
DOI: | 10.1002/adma.202402156 |