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Published on: April 10, 2018
Dynamic Cr-triggered reconstruction enables Ni-O covalency modulation for industrial-level alkaline oxygen evolution
Yufeng Zhang1, Ruxin Lei2, Li Chen2
1School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China.
This study introduces a novel chromium-modified nickel oxalate catalyst (NMCrH) that significantly enhances the oxygen evolution reaction (OER) kinetics and durability by optimizing surface reconstruction for efficient energy conversion.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- The oxygen evolution reaction (OER) is kinetically limited, hindering efficient energy conversion.
- Tuning the reconstruction dynamics of active catalytic phases is crucial for boosting OER performance.
Purpose of the Study:
- To design a Cr-modified nickel oxalate pre-catalyst (NMCrH) on Ni-Mo foam.
- To steer the operando surface reconstruction towards OER-active NiOOH with enhanced properties.
- To improve the efficiency and durability of the oxygen evolution reaction.
Main Methods:
- Synthesis of a Cr-modified nickel oxalate pre-catalyst on Ni-Mo foam (NMCrH).
- Operando surface reconstruction analysis to understand the catalytic phase transformation.
- Electrochemical testing to evaluate OER performance, including overpotential and durability.
Main Results:
- NMCrH promotes surface reconstruction into OER-active NiOOH with strong Ni-O covalency.
- The catalyst exhibits more activated lattice oxygen and a flexible lattice structure.
- The OER pathway shifts from adsorbate evolution mechanism (AEM) to the lattice oxygen mechanism (LOM).
- Achieved a low overpotential of 248 mV at 10 mA cm-2 and remarkable durability of 3049 h at 1 A cm-2.
Conclusions:
- The designed NMCrH catalyst effectively reconciles OER stability with kinetics.
- Optimized surface reconstruction is a viable strategy for boosting electrocatalyst performance.
- The shift to LOM significantly enhances OER efficiency and longevity.
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