Abstract
The construction of highly stable and efficient electrocatalysts is desirable for seawater splitting but remains challenging due to the high concentration of Cl-in seawater.Herein,FeOOH/Ni(OH)2 heterostructure sup-ported on Ni3S2-covered nickel foam(Fe-Ni/Ni3S2/NF)was fabricated by hydrothermal and etching methods,as well as anodic oxidation process.The electronic structure of FeOOH and Ni(OH)2 could be modulated after depositing FeOOH nanoparticles on Ni(OH)2 nanosheet,which greatly boosted the catalytic activity.When the catalyst used as an electrode for oxygen evolution reaction(OER),it needed low overpotentials of 266 and 368 mV to achieve current densities of 100 and 800 mA·cm-2,respectively,in 1 mol·L-1 KOH+seawater electrolyte.It can operate continuously at 100 mA·cm-2 for 400 h without obvious decay.Particularly,in situ generated SO42-from inner Ni3S2 during electrolysis process would accumulate on the surface of active sites to form passivation layers to repel Cl-,which seemed to be responsible for superior stability.The study not only syn-thesizes an OER catalyst for highly selective and stable seawater splitting,but also gives a novel approach for industrial hydrogen production.
基金项目
National Natural Science Foundation of Shandong Province(ZR2022QB062)
National Natural Science Foundation of Shandong Province(ZR2021MB070)
DNL Cooperation Fund(DNL202010)
Research Innovation Fund(QIBEBTSZ201801)
DICP and QIBEBT(UN201804)
NETL
NSTL
万方数据