Premium
Carbon‐Coordinated Single Cr Site for Efficient Electrocatalytic N 2 Fixation
Author(s) -
Song Wei,
Fu Ling,
He Chaozheng,
Xie Kun
Publication year - 2021
Publication title -
advanced theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.068
H-Index - 17
ISSN - 2513-0390
DOI - 10.1002/adts.202100044
Subject(s) - density functional theory , electrocatalyst , catalysis , chemistry , ammonia production , reversible hydrogen electrode , electrochemistry , computational chemistry , electrode , organic chemistry , reference electrode
Electrocatalytic nitrogen reduction reaction (NRR) is a very promising method for ammonia (NH 3 ) synthesis under ambient conditions, which can provide alternative routes to the traditional Haber–Bosch process and realize green NH 3 synthesis. In this study, the electrocatalytic performance of chromium (Cr) atom anchored to graphyne (Cr@GY) is systematically investigated using density functional theory (DFT) calculations. The results show that Cr@GY is an efficient NRR electrocatalyst which can activate the inert N≡N bond sufficiently. In particular, the enzymatic mechanism is considered as the most positive catalytic pathway with the limiting potential of −0.52 V. More importantly, Cr@GY can restrict a competitive hydrogen evolution reaction (HER). The electronic properties including Bader charge, the charge difference density (CDD), the partial density of states (PDOS) and the crystal orbital Hamilton population (COHP) have been analyzed in detail. In addition, the co‐doping of B and N atoms in GY is beneficial to reduce the energy barrier of the potential‐determining step (PDS) and promote the smooth progress of the NRR. This work can provide theoretical guidance for the experimental synthesis of the single‐atom catalysts (SACs) with high activity and stability.