Journal
CHEMICAL ENGINEERING JOURNAL
Volume 395, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125180
Keywords
FeNi-oxyhydroxide; Nanosheet array; In-situ synthesis; Earth-abundant electrocatalyst; Oxygen evolution reaction
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Funding
- National Natural Science Foundation of China [51773184, 21373147, 21875097, 21671096]
- Shenzhen Peacock Plan [KQTD2016022620054656]
- Basic Research Project of the Science and Technology Innovation Commission of Shenzhen [JCYJ20170412153139454]
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The design and synthesis of efficient and affordable electrocatalysts for water oxidation are essential to advance water splitting technology, which depends on developing earth-abundant catalytic materials with rational compositions and structures. Here, we propose a facile synthesis of FeNiOOH nanosheets grown on FeNi foam (FNF) by in-situ chemical oxidation as a novel 3D electrode for oxygen evolution reaction (OER). This FeNiOOH/FNF electrode shows outstanding electrocatalytic performance in alkaline electrolyte, including high OER activity that requires a small overpotential of 252 mV to achieve a current density of 10 mA cm(-2), favourable OER kinetics with a low Tafel slope of 36.8 mV dec(-1), and excellent operation stability for at least 50 h. The superior OER properties are resulted from the highly active FeNi-oxyhydroxide species and advantageous nanosheet array structure. This work presents an effective strategy to rationalize self-supporting electrodes consisting of nanostructured arrays on conductive substrates, creating new opportunities to search for more advanced materials towards a sustainable energy future.
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