Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 48, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102141
Keywords
electrocatalysts; layered double hydroxides; metal-organic frameworks; nanocages; oxygen evolution
Categories
Funding
- National Natural Science Foundation of China [51972077]
- Fundamental Research Funds for the Central Universities [3072021CFT2506, 3072020CFT2505, 3072020CF2518, 3072021CF2523, 3072021CF2524]
- Heilongjiang Touyan Innovation Team Program
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This study successfully prepared FeCoNi-LDHs with high activity and stability for the oxygen evolution reaction (OER) using a simple room-temperature-stirring strategy. The material features hollow structure and assembly of ultrathin layered nanosheets, showing significantly improved activity and stability compared to IrO2.
Highly efficient electrocatalysts for the oxygen evolution reaction (OER) are very important for various energy storage and conversion systems such as water splitting devices and metal-air batteries. However, developing OER electrocatalysts with high activity and excellent stability at a high current density remains a considerable challenge. Herein, a facile room-temperature-stirring strategy is described to obtain FeCoNi layered double hydroxide nanocages (FeCoNi-LDHs) using a metal-organic framework as a precursor. The FeCoNi-LDHs have hollow features, while their walls are assembled with ultrathin layered hydroxide nanosheets. By designing a unique structure and tuning the composition, high activity and robust long-term stability of the FeCoNi-LDHs for the OER outperform IrO2, used as the reference catalyst. The as-obtained high electrochemically active surface area and the decreased transfer resistance are ascribed to the significantly improved activity. Density functional theory calculations suggest that the introduction of Fe can fine-tune the electronic structure and decrease the Gibbs free energy difference of the rate-determining step (Delta G(3)), improving the intrinsic activity of FeCoNi-LDHs toward the OER. Furthermore, the proposed room-temperature-stirring strategy can be easily scaled up to more than 10 grams of nanocages through a single batch reaction process, demonstrating the large-scale applicability of the catalysts.
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