Journal
ADVANCED SCIENCE
Volume 9, Issue 34, Pages -Publisher
WILEY
DOI: 10.1002/advs.202204800
Keywords
cation exchange; nanoarray structure; oxygen evolution reaction; transition and noble metals; urea oxidation reaction
Categories
Funding
- National R&D Program through the National Research Foundation of Korea (NRF) [2022M3H4A1A01008918]
- Korea Research Institute of Chemical Technology Core Research Program - Korea Research Council for Industrial Science and Technology [KS2222-10]
- National Natural Science Foundation of China [22109169]
- Max Planck-POSTECH-Hsinchu Center for Complex Phase Materials
- Research Grants Council of Hong Kong (RGC) [16201820, 16206019]
- Project of Hetao Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone [HZQB-KCZYB-2020083]
- National Research Foundation of Korea [2022M3H4A1A01008918] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study synthesized Ni-doped CuO nanoarrays using a cation exchange strategy, which exhibit a low equilibrium potential and can be used to efficiently drive urea oxidation reaction with high stability. Experimental and theoretical studies show that Ni as the driving force center can enhance urea adsorption and stabilize intermediates, providing a new direction for developing promising Cu-based electrode catalysts.
Urea oxidation reaction (UOR) with a low equilibrium potential offers a promising route to replace the oxygen evolution reaction for energy-saving hydrogen generation. However, the overpotential of the UOR is still high due to the complicated 6e(-) transfer process and adsorption/desorption of intermediate products. Herein, utilizing a cation exchange strategy, Ni-doped CuO nanoarrays grown on 3D Cu foam are synthesized. Notably, Ni-CuO NAs/CF requires a low potential of 1.366 V versus a reversible hydrogen electrode to drive a current density of 100 mA cm(-2), outperforming various benchmark electrocatalysts and maintaining robust stability in alkaline media. Theoretical and experimental studies reveal that Ni as the driving force center can effectively enhance the urea adsorption and stabilize CO*/NH* intermediates toward the UOR. These findings suggest a new direction for constructing nanostructures and modulating electronic structures, ultimately developing promising Cu-based electrode catalysts.
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