Details

Autor(en) / Beteiligte

• Lai, Feili
• Feng, Jianrui
• Ye, Xiaobin
• Zong, Wei
• He, Guanjie
• Yang, Chao
• Wang, Wei
• Miao, Yue-E
• Pan, Bicai
• Yan, Wensheng
• Liu, Tianxi
• Parkin, Ivan P

Titel

Oxygen vacancy engineering in spinel-structured nanosheet wrapped hollow polyhedra for electrochemical nitrogen fixation under ambient conditions

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2020-01, Vol.8 (4), p.1652-1659

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Electrochemical nitrogen-to-ammonia conversion by the nitrogen reduction reaction (NRR) under ambient conditions is regarded as a potential approach to tackle the energy-intensive Haber-Bosch process with excessive CO 2 emission. However, the NRR is still restricted by low faradaic efficiency and NH 3 yield, which is due to the chemical inertness of N-related groups for efficient adsorption/activation on the electrocatalysts. Here, a series of spinel-structured nanosheet wrapped hollow nitrogen-doped carbon polyhedra with abundant oxygen vacancies are constructed successfully. From theoretical aspects, these materials show increased charge density on their surface for enhanced capture and activation of N 2 molecules. As a result, oxygen vacancy-rich NiCo 2 O 4 on hollow N-carbon polyhedra ( V o -rich NiCo 2 O 4 @HNCP) shows outstanding electrocatalytic NRR performance with high production yield (NH 3 : 4.1 μg h −1 cm −2 /17.8 μg h −1 mg −1 ; faradaic efficiency: 5.3%) and high stability under ambient conditions and is superior to the counterpart oxygen vacancy-poor electrocatalysts. Oxygen vacancy engineering introduces a new concept for rational design of advanced NRR catalysts for energy conversion systems. Electrochemical nitrogen-to-ammonia conversion under ambient conditions is realized by an oxygen vacancy-rich spinel structured materials, showing relatively high faradaic efficiency and yields.