Engineering Mo/Mo2C/MoC hetero-interfaces for enhanced electrocatalytic nitrogen reduction
Liu, Y (Liu, Ying)[ 1,2 ] ; Zhu, XR (Zhu, Xiaorong)[ 1 ] ; Zhang, QH (Zhang, Qinghua)[ 3 ] ; Tang, T (Tang, Tang)[ 2,4 ] ; Zhang, Y (Zhang, Yun)[ 2 ] ; Gu, L (Gu, Lin)[ 3 ] ; Li, YF (Li, Yafei)[ 1 ] ; Bao, JC (Bao, Jianchun)[ 1 ] ; Dai, ZH (Dai, Zhihui)[ 1 ]*（戴志晖）; Hu, JS (Hu, Jin-Song)[ 2,4 ]*
[ 1 ]Nanjing Normal Univ, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Sch Chem & Mat Sci, Nanjing 210023, Peoples R China
[ 2 ]Chinese Acad Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing Natl Lab Mol Sci BNLMS, Beijing 100190, Peoples R China
[ 3 ]Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[ 4 ]Univ Chinese Acad Sci, Beijing 100049, Peoples R China
JOURNAL OF MATERIALS CHEMISTRY A，202005,8(18),8920-8926
The development of efficient and cost-effective electrocatalysts is essential for the electrochemical reduction of N-2 to produce NH3 under ambient conditions. Herein, various well-dispersed Mo-based nanoparticles are selectively synthesized to reveal the influences of the compositions and hetero-interfaces on the performance for the N-2 reduction reaction (NRR). Systematic experiments discovered that compared with single-component Mo2C or Mo nanoparticles, the heterostructured binary MoC/Mo2C and ternary Mo/MoC/Mo2C nanoparticles exhibit significantly enhanced NRR performance by creating abundant hetero-interfaces. Moreover, theoretical calculations reveal that the integration of metallic Mo with MoC/Mo2C appreciably reduces the energy demand for NH3 desorption, contributing to the enhanced NRR process. As a result, a remarkable NH3 yield rate of up to 20.4 mu g h(-1) mg(-1) and a FE up to 18.9% can be achieved. These findings suggest that engineering crystalline phases and hetero-interfaces represents a new avenue for advancing the electrocatalytic performance of a NRR catalyst.