Selenate oxyanion-intercalated NiFeOOH for stable water oxidation via lattice oxygen oxidation mechanism  

作　　者：Yijie Zhang Weiyi Zhang Xiaowen Zhang Jinping Li Guang Liu 

机构地区：[1]Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024 Shanxi,China [2]Shanxi Research Institute of HuaiRou Laboratory,Taiyuan 030031,Shanxi,China

出　　处：《Journal of Energy Chemistry》2025年第2期676-684,I0014,共10页能源化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(22075196,U22A20418,21878204);the Research Project Supported by Shanxi Scholarship Council of China(2022-050).

摘　　要：Transition metal-based compounds can serve as pre-catalysts to obtain genuine oxygen evolution reaction(OER)electrocatalysts in the form of oxyhydroxides through electrochemical activation.However,the role and existence form of leached oxygen anions are still controversial.Herein,we selected iron selenite-wrapped hydrated nickel molybdate(denoted as NiMoO/FeSeO)as a pre-catalyst to study the oxyanion effect.It is surprising to find that SeO_(2)-exists in the catalyst in the form of intercalation,which is different from previous studies that suggest that anions are doped with residual elements after electrochemical activation,or adsorbed on the catalyst surface.The experiment and theoretical calculations show that the existence of SeO_(4)^(2-)intercalation effectively adjusts the electronic structure of NiFeOOH,promotes intramolecular electron transfer and O-O release,and thus lowers the reaction energy barrier.As expected,the synthesized NiFeOOH-SeO only needs 202 and 285 mV to attain 100 and 1000 mA cm^(-2)in 1 M KOH.Further,the anion exchange membrane water electrolyzer(AEMWE)consisting of NiFeOOHSeO anode and Pt/C cathode can reach 1 A cm^(-2)at 1.70 V and no significant attenuation within 300 h.Our findings provide insights into the mechanism,by which the intercalated oxyanions enhance the OER performance of NiFeOOH,thereby facilitating large-scale hydrogen production through AEMWE.

关 键 词：Anion exchange membrane electrolyzer Latticeoxygen oxidation Industrial current densities Oxyanion intercalation Water splitting 

分 类 号：O643.36[理学—物理化学]