Oxygen vacancy engineering of calcium cobaltate:A nitrogen fixation electrocatalyst at ambient condition in neutral electrolyte

• 作者: Xinyu Chen Ke Li Xiaoxuan Yang Jiaqi Lv Sai Sun Siqi Li Dongming Cheng Bo Li Yang-Guang Li Hong-Ying Zang
• 来源期刊: 纳米研究（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Research Articles
• 页码范围: 501-506
• 页数: 6页
• 语种: 英文

摘要

In order to sustainably transform N2 to ammonia (NRR) using electrocatalysts under mild ambient condition,it is urgent to design and develop non-nobel metal nanocatalysts that are inexpensive and suitable for mass-production.Herein,a calcium metalate catalyst CaCoOx with oxygen vacancies was synthesized and used as an electrocatalyst for NRR for the first time,whose morphology can be controlled by the calcination temperature and the heating rate.Under the optimal conditions,the CaCoOx catalyst achieved the yield of nitrogen conversion to ammonia of 16.25 μg·h-1·mgcat-1 at the potential of-0.3 V relative to the reversible hydrogen electrode (RHE) with a Faraday efficiency of 20.51％.The electrocatalyst showed good stability even after 12 times recyclability under environmental conditions and neutral electrolyte.Later,the electrocatalytic nitrogen reduction performance of CaFeOx,CaNiOx,CaCuOx was investigated.These earth-rich transition metals also exhibited certain NRR electrocatalytic capabilities,which provided a door for further development of inexpensive end easily available transition metal as nitrogen reduction electrocatalysts.