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
Hauptverfasser: Wang, Yuan, Arandiyan, Hamidreza, Mofarah, Sajjad S, Shen, Xiangjian, Bartlett, Stuart A, Koshy, Pramod, Sorrell, Charles C, Sun, Hongyu, Pozo-Gonzalo, Cristina, Dastafkan, Kamran, Britto, Sylvia, Bhargava, Suresh K, Zhao, Chuan
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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.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202402156