Efficient electrocatalytic conversion of N_(2) to NH_(3) using oxygen-rich vacancy lithium niobate cubes  

作　　者：Shuhui Fan Qi Wang Yanan Hu Qiang Zhao 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,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第10期132-138,共7页中国化学工程学报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(22075196,21878204);Key Research and Development Program of Shanxi Province(International Cooperation,201903D421073);Research Project Supported by Shanxi Scholarship Council of China(2022-050).

摘　　要：Instead of the energy-intensive Haber-Bosch process,the researchers proposed a way to produce ammonia using water and nitrogen as feedstock,powered by electricity,without polluting the environment.Nevertheless,how to design efficient electrocatalyst for electrocatalytic nitrogen reduction reaction(NRR)is still urgent and challenging.Herein,a strategy is proposed to adjust the morphology and surface electronic structure of electrocatalyst by optimizing material synthesis method.LiNbO3(lithium niobate,LN)cubes with oxygen-rich vacancy and regular morphology were synthesized by hydrothermal synthesis and followed molten salt calcination process,which were used for electrocatalytic NRR under mild conditions.Compared with LN nanoparticles synthesized by solid phase reaction,LN cubes exhibit better NRR performance,with the highest ammonia yield rate(13.74μg.h^(-1).mg^(-1))at the best potential of-0.45V(vs.reversible hydrogen electrode,RHE)and the best Faradaic efficiency(85.43%)at-0.4 V.Moreover,LN cubes electrocatalyst also demonstrates high stability in 7 cycles and 18 h current-time tests.Further investigation of the reaction mechanism confirmed that the structure of oxygen vacancy could adjust the electronic structure of the electrocatalyst,which was conducive to the adsorption and activation of N_(2) molecule and also increased the ECSA of electrocatalyst,thus providing more active sites for the NRR process.

关 键 词：Nitrogen reduction reaction Ammonia yield rate Oxygen vacancy LiNbO_(3)cubes Electronic structure 

分 类 号：TQ113.2[化学工程—无机化工]