期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 23, 页码 5904-5911出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201806377
关键词
electrochemistry; gold; nanostructures; redox chemistry; supported catalysts
资金
- National Natural Science Foundation of China [51672277]
- CAS Pioneer Hundred Talents Program
- CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences, China
Electrosynthesis of NH3 through the N-2 reduction reaction (NRR) under ambient conditions is regarded as promising technology to replace the industrial energy- and capital-intensive Haber-Bosch process. Herein, a room-temperature spontaneous redox approach to fabricate a core-shell-structured Au@CeO2 composite, with Au nanoparticle sizes below about 10 nm and a loading amount of 3.6 wt %, is reported for the NRR. The results demonstrate that as-synthesized Au@CeO2 possesses a surface area of 40.7 m(2) g(-1) and a porous structure. As an electrocatalyst, it exhibits high NRR activity, with an NH3 yield rate of 28.2 mu g h(-1) cm(-2) (10.6 mu g h(-1) mg(cat.)(-1), 293.8 mu g h(-1) mg(Au)(-1)) and a faradaic efficiency of 9.50 % at -0.4 V versus a reversible hydrogen electrode in 0.01 m H2SO4 electrolyte. The characterization results reveal the presence of rich oxygen vacancies in the CeO2 nanoparticle shell of Au@CeO2; these are favorable for N-2 adsorption and activation for the NRR. This has been further verified by theoretical calculations. The abundant oxygen vacancies in the CeO2 nanoparticle shell, combined with the Au nanoparticle core of Au@CeO2, are electrocatalytically active sites for the NRR, and thus, synergistically enhance the conversion of N-2 into NH3.
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