Journal
NANO ENERGY
Volume 53, Issue -, Pages 74-82Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.08.045
Keywords
Layered double hydroxide; Nanomesh; Porous material; Oxygen evolution reaction; Water splitting
Categories
Funding
- National Natural Science Foundation of China [21501112, 21401181, 21535004, U1532265, 21331005, 11621063, 21390411, U1632149]
- Natural Science Foundation of Shandong Province [ZR2018JL009]
- Key Research Program of Frontier Sciences [QYZDY-SSW-SLH011]
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Herein, abundant and uniform nanopores with sub-3-nm sizes are introduced to 1.5 nm-thick nickel-iron layered double hydroxide (NiFe LDH) ultrathin nanosheets via an etching-aging process, realizing remarkable enhancement in oxygen evolution reaction (OER) performance. Detailed analyses revealed that the NiFe LDH phase around the nanopores can be preferentially oxidized into electroactive Fe:NiOOH phase. In addition, the buffering space provided by the nanopores can effectively avoid structural deformation during repeated redox cycling, leading to better electrochemical stability, which synergistically make the catalyst a promising candidate for commercial water splitting. This work highlights the positive role of porous structure in accelerating the formation of active phases beyond just increment of surface area, which can provide insight in designing advanced catalysts.
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