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Direct Electrochemical Ammonia Synthesis from Nitric Oxide
Author(s) -
Long Jun,
Chen Shiming,
Zhang Yunlong,
Guo Chenxi,
Fu Xiaoyan,
Deng Dehui,
Xiao Jianping
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202002337
Subject(s) - electrocatalyst , electrochemistry , ammonia , faraday efficiency , catalysis , chemistry , ammonia production , inorganic chemistry , oxide , transition metal , electrode , reactivity (psychology) , metal , organic chemistry , medicine , alternative medicine , pathology
NO removal from exhausted gas is necessary owing to its damage to environment. Meanwhile, the electrochemical ammonia synthesis (EAS) from N 2 suffers from low reaction rate and Faradaic efficiency (FE). Now, an alternative route for ammonia synthesis is proposed from exhaust NO via electrocatalysis. DFT calculations indicate electrochemical NO reduction (NORR) is more active than N 2 reduction (NRR). Via a descriptor‐based approach, Cu was screened out to be the most active transition metal catalyst for NORR to NH 3 owing to its moderate reactivity. Kinetic barrier calculations reveal NH 3 is the most preferred product relative to H 2 , N 2 O, and N 2 on Cu. Experimentally, a record‐high EAS rate of 517.1 μmol cm −2 h −1 and FE of 93.5 % were achieved at −0.9 V vs. RHE using a Cu foam electrode, exhibiting stable electrocatalytic performances with a 100 h run. This work provides an alternative strategy to EAS from exhaust NO, coupled with NO removal.