Electrochemical Reduction of N2 into NH3 under Ambient Conditions Using Ag-doped TiO2 Nanofibers

被引:9
|
作者
Dong, Yingying [1 ]
Wang, Tao [1 ]
Hu, Shui [1 ]
Tang, Ying [2 ]
Hu, Xiaotong [1 ]
Ye, Yaoyao [1 ]
Li, Hui [1 ]
Cao, Ding [1 ]
机构
[1] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Coll Chem, Beijing 100029, Peoples R China
[2] Beijing Technol & Business Univ, Beijing Key Lab Plant Resources Res & Dev, Coll Chem & Mat Engn, Beijing 100048, Peoples R China
基金
中国国家自然科学基金;
关键词
nitrogen fixation; electrochemical reduction; Ag-doped TiO2; nanofibers; electrospinning; AMMONIA; FIXATION;
D O I
10.1021/acsanm.1c01761
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The efficient electrochemical synthesis of ammonia (NH3) is a topic of great concern in theoretical research and in various industries. However, given the limitations of high-performance catalysts, achieving high NH3 yields from the electrocatalytic N-2 reduction reaction (ENRR) remains challenging. In this work, we report that a Ag-doped titanium dioxide (TiO2) nanofiber catalyst synthesized by a simple electrospinning method could effectively convert N-2 into NH3 at room temperature. The Ag-doped TiO2 nanofibers had a high NH3 yield rate of 3.158 x 10(-10) mol s(-1) cm(-2) with a Faradaic efficiency (FE) of 0.13% at a low overpotential of -0.6 V versus a reversible hydrogen electrode (RHE) in acidic solution (0.1 mol L-1 HCl). The absence of hydrazine in the system proved that the prepared catalyst has excellent selectivity. Operation for eight consecutive cycles at an overpotential of -0.6 V vs RHE demonstrated the high stability of the Ag-doped TiO2 nanofibers without obvious variations in the NH3 yield rate and FE. The current density in the chronoamperometric curve did not decrease remarkably over 12 h of continuous electrolysis, thus confirming the durability of the catalyst. This work proves that Ag/TiO2 nanofibers may be a highly efficient ENRR catalyst that could achieve high NH3 yield rates. The unique structure of the interface between Ag and TiO2 in the Ag/TiO2 nanofibers prepared by electrospinning not only enhances the adsorption of N-2 but also promotes electron exchange and the synergy between the nanofibers and N-2.
引用
收藏
页码:10370 / 10377
页数:8
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