Journal
INORGANIC CHEMISTRY
Volume 60, Issue 22, Pages 17371-17378Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c02903
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Funding
- National Natural Science Foundation of China [21905118]
- China Postdoctoral Science Foundation [2020 M673037, 2019 M662166]
- Priority Academic Program Development of the Jiangsu Higher Education Institutions
- Jiangsu Provincial Agricultural Science and Technology Independent Innovation Fund [CX(20)3081]
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In this study, an advanced bifunctional electrocatalyst based on NiFe layered double hydroxide (LDH)/FeOOH heterostructure nanosheets was successfully synthesized via a simple electrodeposition method. The electrode demonstrated excellent electrocatalytic activity and stability, providing a valid strategy for designing a non-noble metal catalyst for seawater splitting. This work highlights the potential of the NiFe LDH/FeOOH heterostructure in facilitating active NiOOH species formation and enhancing overall alkaline simulated seawater splitting efficiency.
Electrolysis of seawater can not only desalinate seawater but also produce high-purity hydrogen. Nevertheless, the presence of chloride ions in seawater will cause electrode corrosion and also undergo a chlorine oxidation reaction (ClOR) that competes with the oxygen evolution reaction (OER). Therefore, highly efficient and long-term stable electrocatalysts are needed in this field. In this work, an advanced bifunctional electrocatalyst based on NiFe layered double hydroxide (LDH)/FeOOH heterostructure nanosheets (NiFe LDH/FeOOH) was synthesized on nickel-iron foam (INF) via a simple electrodeposition method. The NiFe LDH/FeOOH electrode demonstrates excellent electrocatalytic activity and stability, which results from the strong interaction between FeOOH and NiFe LDH. Furthermore, ex situ X-ray photoelectron spectroscopy (XPS) and in situ Raman spectroscopy revealed the catalytic process and also demonstrated that the NiFe LDH/FeOOH heterostructure could facilitate the formation of active NiOOH species in the reaction. The obtained NiFe LDH/FeOOH catalyst displays low overpotentials of 181.8 mV at 10 mA center dot cm(-2) for hydrogen evolution reaction (HER) and 286.2 mV at 100 mA center dot cm(-2) for OER in the 1.0 M KOH + 0.5 M NaCl electrolyte. Furthermore, it also exhibits a low voltage of 1.55 V to achieve the current density of 10 mA center dot cm(-2) and works steadily for 105 h at 100 mA center dot cm(-2) for overall alkaline simulated seawater splitting. This work will afford a valid strategy for designing a non-noble metal catalyst for seawater splitting.
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