Integration of Fe_(2)O_(3)-based photoanode and atomically dispersed cobalt cathode for efficient photoelectrochemical NH_(3) synthesis  

作　　者：Weikang Wang Shengbo Zhang Yanyan Liu Li-Rong Zheng Guozhong Wang Yunxia Zhang Haimin Zhang Huijun Zhao 

机构地区：[1]Key Laboratory of Materials Physics,Centre for Environmental and Energy Nanomaterials,Anhui Key Laboratory of Nanomaterials and Nanotechnology,CAS Center for Excellence in Nanoscience,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031,China [2]University of Science and Technology of China,Hefei 230026,China [3]Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [4]Centre for Clean Environment and Energy,Griffith University,Cold Coast Campus,QLD 4222,Australia

出　　处：《Chinese Chemical Letters》2021年第2期805-810,共6页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.51872292 and 51672277);the CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences,China。

摘　　要：Realizing nitrogen reduction reaction(NRR) to synthesis NH_(3) under mild conditions has gained extensive attention as a promising alternative way to the energy-and emission-intensive Haber-Bosch process.Among varieties of potential strategies,photoelectrochemical(PEC) NRR exhibits many advantages including utilization of solar energy,water(H_(2)O) as the hydrogen source and ambient operation conditions.Herein,we have designed a solar-driven PEC-NRR system integrating high-efficiency Fe_(2)O_(3)-based photoanode and atomically dispersed cobalt(Co) cathode for ambient NH3 synthesis.Using such solar-driven PEC-NRR system,high-efficiency Fe_(2)O_(3)-based photoanode is responsible for H_(2)O/OH oxidatio n,and meanwhile the generated photoelectrons transfer to the single-atom Co cathode for the N_(2) reduction to NH_(3).As a result,this system can afford an NH_(3) yield rate of 1021.5 μg mg_(co)^(-1) h^(-1) and a faradic efficiency of 11.9% at an applied potential bias of 1.2 V(versus reversible hydrogen electrode) on photoanode in 0.2 mol/L NaOH electrolyte under simulated sunlight irradiation.

关 键 词：PEC-NRR Co-SAC CoPi/Ti-Fe_(2)O_(3) NH3 synthesis Photoelectrochemisty 

分 类 号：TQ113.26[化学工程—无机化工] TQ426