Journal
SMALL
Volume 18, Issue 37, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202203710
Keywords
iron oxyhydroxide; large current density; long-term stability; oxygen evolution reaction; reconstruction
Categories
Funding
- National Key R&D Program of China [2021YFC2900900]
- National Natural Science Foundation of China [51776094, 91963129]
- Guangdong Provincial Key Laboratory of Energy Materials for Electric Power [2018B030322001]
- Fundamental Research Funds for the Central Universities [2020-YB-030]
- Student Innovation Training Program [2021S07]
- Southern University of Science and Technology (SUSTech)
- Southern University of Science and Technology Core Research Facilities
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In this study, a robust and high output Zn-doped NiOOH-FeOOH (Zn-FexNi(1-x))OOH catalyst is developed by electro-oxidation-induced reconstruction. The reconstructed electrode exhibits superior corrosion resistance, enhanced catalytic activity, and bonding force at the catalyst-support interface. This work provides insights into the electrocatalyst reconstruction during the OER process and facilitates the design of high-performance OER catalysts.
Developing FeOOH as a robust electrocatalyst for high output oxygen evolution reaction (OER) remains challenging due to its low conductivity and dissolvability in alkaline conditions. Herein, it is demonstrated that the robust and high output Zn doped NiOOH-FeOOH (Zn-FexNi(1-x))OOH catalyst can be derived by electro-oxidation-induced reconstruction from the pre-electrocatalyst of Zn modified Ni metal/FeOOH film supported by nickel foam (NF). In situ Raman and ex situ characterizations elucidate that the pre-electrocatalyst undergoes dynamic reconstruction occurring on both the catalyst surface and underneath metal support during the OER process. That involves the Fe dissolution-redeposition and the merge of Zn doped FeOOH with in situ generated NiOOH from NF support and NiZn alloy nanoparticles. Benefiting from the Zn doping and the covalence interaction of FeOOH-NiOOH, the reconstructed electrode shows superior corrosion resistance, and enhanced catalytic activity as well as bonding force at the catalyst-support interface. Together with the feature of superaerophobic surface, the reconstructed electrode only requires an overpotential of 330 mV at a high-current-density of 1000 mA cm(-2) and maintains 97% of its initial activity after 1000 h. This work provides an in-depth understanding of electrocatalyst reconstruction during the OER process, which facilitates the design of high-performance OER catalysts.
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