Journal
ADVANCED MATERIALS
Volume 34, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202108619
Keywords
electrocatalysis; electrochemical activation pretreatment; heteroarchitectures; oxygen evolution reaction; saline water splitting
Categories
Funding
- From 0 to 1 Innovative program of CAS [ZDBS-LY-JSC021]
- Natural Science Foundation of Zhejiang Province [LY21E020008, LY21B030006]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2020300]
- National Natural Science Foundation of China [52002378, U20A20251]
- Science and Technology Innovation 2025 Program in Ningbo [2019B10046, 2019B10041, 2020Z107]
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This study successfully fabricates metal oxy(hydroxide) nanosheet structures and demonstrates their outstanding electrocatalytic performance for the oxygen evolution reaction (OER) in saline water. The different structures of NiOOH and NiOOH@FeOOH (NiOOH grown on FeOOH) are formed through electrochemical activation, and the underlayer of FeOOH plays a critical role in enhancing the OER activity of NiOOH. An unconventional dual-sites mechanism (UDSM) is proposed to explain the OER process on NiOOH@FeOOH.
The development of highly efficient non-precious metal electrocatalysts for the oxygen evolution reaction (OER) in low-grade or saline water is currently of great importance for the large-scale production of hydrogen. In this study, by using an electrochemical activation pretreatment, metal oxy(hydroxide) nanosheet structures derived from self-supported nickel-iron phosphide and nitride nanoarrays grown on Ni foam are successfully fabricated for OER catalysis in saline water. It is demonstrated that the different NiOOH and NiOOH@FeOOH (NiOOH grown on FeOOH) structures are generated from nickel-iron nitride and phosphide, respectively, after electrochemical activation. In particular, the NiOOH@FeOOH heteroarchitecture shows outstanding electrocatalytic performance with an ultralow overpotential of 292 mV to drive the current density of 500 mA cm(-2). An unconventional dual-sites mechanism (UDSM) is proposed to address the OER process on NiOOH@FeOOH and show that the FeOOH underlayer plays a critical role regarding the enhanced OER activity of NiOOH. The new possible UDSM involving two reaction sites presents a different understanding of the OER process on multi-OH layer complexes, which is expected to guide the design of heteroarchitecture electrocatalysts.
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