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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
Published on: August 17, 2016
Stacking Fault-Enriched MoNi4/MoO2 Enables High-Performance Hydrogen Evolution
Yuan Wang1, Hamidreza Arandiyan2,3, Sajjad S Mofarah4
1Department of Chemical Engineering, The University of Melbourne, Parkville, VIC, 3010, Australia.
Researchers developed a novel non-platinum catalyst (d-MoNi) using stacking fault defects for efficient green hydrogen production via water electrolysis. This breakthrough offers a cost-effective and sustainable alternative to platinum catalysts for the hydrogen economy.
Area of Science:
- Materials Science
- Electrochemistry
- Green Chemistry
Background:
- Cost-effective green hydrogen production via water electrolysis is crucial for a sustainable hydrogen economy.
- Platinum-based catalysts, while effective for the hydrogen evolution reaction (HER), are limited by high cost and scarcity.
- Developing non-precious metal catalysts is essential for economic viability.
Purpose of the Study:
- To engineer a high-performance, non-platinum electrocatalyst for the hydrogen evolution reaction (HER).
- To investigate the role of stacking fault (SF) defects in enhancing HER activity.
- To provide a new synthetic strategy for defective metal alloy electrocatalysts.
Main Methods:
- A combined chemical and thermal reduction strategy was employed to create MoNi4/MoO2 nanosheets with high fractions of stacking fault (SF) defects (d-MoNi).
- Electrochemical performance for HER was evaluated using overpotentials at various current densities in 1 M KOH.
- Catalyst activity and durability were compared against a benchmark platinum catalyst (20% Pt/C).
- Density Functional Theory (DFT) calculations were used to understand the mechanism of defect-enhanced HER activity.
Main Results:
- The d-MoNi catalyst demonstrated ultralow overpotentials for HER (78 mV at 500 mA cm-2 and 121 mV at 1000 mA cm-2).
- The defect-rich catalyst exhibited four times higher turnover frequency than 20% Pt/C.
- Excellent durability (> 100 hours) was observed, positioning d-MoNi as a leading non-Pt HER catalyst.
- Abundant SFs were found to induce compressive strain, optimizing proton adsorption and hydrogen desorption.
Conclusions:
- Engineered stacking fault defects in MoNi4/MoO2 nanosheets create a highly active and durable non-platinum catalyst for the hydrogen evolution reaction.
- The d-MoNi catalyst presents a promising, cost-effective alternative to platinum for green hydrogen production.
- This work offers a viable synthetic route for developing advanced electrocatalysts for energy conversion applications.
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