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    • Unveiling Structural Evolution of Fe Single Atom Catalyst in Nitrate Reduction for Enhanced Electrocatalytic Ammonia Synthesis

    Xusheng Cheng,Wenzhe Shang,Yuehui Li,Jinwen Hu,Jingya Guo,Dequan Cao,Naitian Zhang,Songlin Zhang,Suchan Song, Tianna Liu,Wei Liu,Yantao Shi

    Nano Research（2024）

    Dalian University of Technology

    Cited 1|Views8
    Abstract
    Atomic transition metal–nitrogen–carbon electrocatalysts exhibit outstanding activity in various electrocatalytic reactions. The challenge lies in predicting the structure of the active center, which may undergo changes under applied potential and interact with reactants or intermediates. Advanced characterization techniques, particularly in-situ X-ray absorption spectroscopy (XAS), provide crucial insights into the structural evolution of the metal active center during the reaction. In this study, nitrate reduction to ammonia (NO3RR) was selected as a model reaction, and we introduced in-situ XAS to reveal the structural evolution during the catalytic process. A novel single atom catalyst of iron loaded on three-dimensional nitrogen-carbon nanonetwork (designated as Fe SAC/NC) was successfully synthesized. We unraveled the structural transformations occurring as pyrrole-N4-Fe transitions to pyrrole-N3-Fe throughout the NO3RR process. Notably, the Fe SAC/NC catalyst exhibited excellent catalytic activity, achieving a Faradaic efficiency of 98.2
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    structural evolution,Fe single atom catalysis,in-situ X-ray absorption spectroscopy,nitrate reduction to ammonia
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