首页|Hierarchical FeOxHy@Ni3B hybrid for efficient alkaline oxygen evolution at high current density
Hierarchical FeOxHy@Ni3B hybrid for efficient alkaline oxygen evolution at high current density
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Electrocatalysts with high activity and long-term durability are vital toward large-scale hydrogen pro-duction from electrocatalytic water splitting.Here,the self-supported electrode(FeOxHy@Ni3B/NF)with hierarchical heterostructure was simply prepared by using Ni3B chunks grown on nickel foam as sub-strate to in situ form vertical FeOxHy nanosheets.Such hybrid shows efficient oxygen evolution reaction activity with overpotentials as low as 267 and 249 mV at 100 mA cm-2 in 1 M KOH solution and 30 wt％KOH solution,respectively.Meanwhile,it also exhibits excellent catalytic stability,sustaining catalysis at 500 mA cm-2 in 1 M KOH solution for 200 h,and even for 200 h at 1000 mA cm-2 in 30 wt％KOH solution.Further experimental results reveal that the FeOxHy@Ni3B/NF is endowed with superhydrophilic and superaerophobic surface properties,which not only provide more mass transport channels,as well as facilitated the diffusion of reaction intermediates and gas bubbles.Also,it holds faster reaction kinetics,more accessible active sites and accelerated electron transfer rates due to strong synergistic interactions at the heterogeneous interface.
Key Laboratory of Automobile Materials Ministry of Education,School of Materials Science & Engineering,Electron Microscopy Center,International Center of Future Science,Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials,Jilin University,Changchun 130012,Jilin,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
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