Journal
SCIENCE CHINA-MATERIALS
Volume 63, Issue 7, Pages 1182-1195Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-020-1276-8
Keywords
atomically dispersed catalyst; NiFe layered double hydroxide; oxygen electrocatalyst; bifunctionality; zinc-air battery
Categories
Funding
- National Natural Science Foundation of China [21701101]
- National Key Research and Development Project, Key Projects of Intergovernmental International Innovation Cooperation [2018YFE0118200, 2016YFF0204402]
- Fundamental Research Funds for the Central Universities [18CX06063A]
- Key Research and Development Project of Shandong Province [2019JZZY010506]
- Scientific Research Awards Foundation for Outstanding Young Scientists of Shandong Province [ZR2018JL010]
- Joint Fund of Outstanding Young Talents of Shandong Province [ZR2017BB018]
- Program of Qingdao Scientific and Technological Innovation High-level Talents Project [17- 2-1-1-zhc]
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An atomically dispersed FeCo-NC material with the 3D flower-like morphology was used as a unique substrate for the controllable deposition of ultrasmall NiFe layered double hydroxide nanodots (termed as NiFe-NDs) to simultaneously promote the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The size-limiting growth of NiFe-NDs (similar to 4.0 nm in diameter) was realized via the confinement of the 3D flower-like mesoporous structure and the rich N/O functionality of FeCo-NC. Benefiting from the distinctive structure with the simultaneously maximum exposure of both OER and ORR active sites, the NiFe-ND/FeCo-NC composite showed an ORR halfwave potential of 0.85 V and an OER potential of 1.66 V in 0.1 mol L-1 KOH at 10.0 mA cm(-2). In-situ Raman analysis suggested the activity of OER was derived from the Ni sites on NiFe-ND/FeCo-NC. Moreover, the NiFe-ND/FeCo-NC-assembled Zn-air battery (ZAB) exhibited a very small discharge- charge voltage gap of 0.87 V at 20 mA cm(-2) and robust cycling stability. Furthermore, the NiFe-ND/FeCo-NC composite was also applicable for fabricating all-solid-state ZAB to power wearable electronics with superior cycling stability under deformation. Our work could enlighten a new applicable branch of atomically dispersed metal-nitrogen-carbon materials as unique substrates for fabricating multifunctional electrocatalysts.
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