Di Li,Yingying Xing,Changjian Zhou,Yikai Lu,Shengjie Xu,Xiangli Shi,Deli Jiang,Weidong Shi
Due to the low-carbon economy requirement in large-scale industrial applications, exploration of active, robust, resourceful, low-cost and efficient oxygen evolution reaction (OER) electrocatalysts is urgently needed. In this work, we report a Fe–N co-doped cobalt selenide nanosheet array (Fe–N–CoSe2) on nickel foam (NF) as a highly efficient OER electrocatalyst via an anion and cation co-doping strategy using a metal–organic framework (MOF) as the precursor. The nanosheet arrays grown on NF without an additional binder are not only beneficial for accelerating the charge transfer, but also for suppressing electrocatalyst shedding. Furthermore, the nanosheet structure constructed using nanograins could promote electrolyte penetration and gas diffusion and increase the active sites. More importantly, the Fe and N element doping can further provide additional active sites, regulate the electronic structure and boost the OER kinetics. In view of the abovementioned points, the as-prepared Fe–N–CoSe2 electrocatalyst exhibits outstanding OER performance and long-term durability. It affords a current density of 50 mA cm−2 at a small overpotential of 270 mV with a Tafel slope of 62.7 mV dec−1, and the Fe–N–CoSe2 electrocatalyst has only a small attenuation of 1.9% after a 100 h constant test at 100 mA cm−2 in alkaline solution, which is superior to the commercial RuO2 electrode. These results offer a potential approach for the preparation of effective and robust OER electrocatalysts as substitutes to replace the expensive commercial electrocatalysts based on element doping.
Cai Zhengwei,Liang Jie,Li Zixiao,Yan Tingyu,Yang Chaoxin,Sun Shengjun,Yue Meng,Liu Xuwei,Xie Ting,Wang Yan,Li Tingshuai,Luo Yongsong,Zheng Dongdong,Liu Qian,Zhao Jingxiang,Sun Xuping,Tang Bo
Electrocatalytic H 2 production from seawater, recognized as a promising technology utilizing offshore renewables, faces challenges from chloride-induced reactions and corrosion. Here, We introduce a catalytic surface where OH – dominates over Cl – in adsorption and activation, which is crucial for O 2 production. Our NiFe-based anode, enhanced by nearby Cr sites, achieves low overpotentials and selective alkaline seawater oxidation. It outperforms the RuO 2 counterpart in terms of lifespan in scaled-up stacks, maintaining stability for over 2500 h in three-electrode tests. Ex situ / in situ analyses reveal that Cr(III) sites enrich OH – , while Cl – is repelled by Cr(VI) sites, both of which are well-dispersed and close to NiFe, enhancing charge transfer and overall electrode performance. Such multiple effects fundamentally boost the activity, selectively, and chemical stability of the NiFe-based electrode. This development marks a significant advance in creating durable, noble-metal-free electrodes for alkaline seawater electrolysis, highlighting the importance of well-distributed catalytic sites.
危险品化学品经营许可证（带存储）