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 Unveiling the Protonation Kinetics-Dependent Selectivity in Nitrogen Electroreduction: Achieving 75.05 % Selectivity
Tác giả hoặc Nhóm tác giả: Dr. Yang Liu,Lingling Wang,Lin Chen,Hongdan Wang,Dr. Amol R. Jadhav,Taehun Yang,Yixuan Wang,Dr. Jinqiang Zhang,Ashwani Kumar,Jinsun Lee,Dr. Viet Q. Bui,Prof. Min Gyu Kim,Prof. Hyoyoung Lee
Nơi đăng: Angewandte Chemie International Edition; Số: e202209555;Từ->đến trang: 1-6;Năm: 2022
Lĩnh vực: Khoa học; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
While higher selectivity of nitrogen reduction reaction (NRR) to ammonia (NH3) is always achieved in alkali, the selectivity dependence on nitrogen (N2) protonation and mechanisms therein are unrevealed. Herein, we profile how the NRR selectivity theoretically relies upon the first protonation that is collectively regulated by proton (H) abundance and adsorption-desorption, along with intermediate-*NNH formation. By incorporating electronic metal modulators (M=Co, Ni, Cu, Zn) in nitrogenase-imitated model-iron polysulfide (FeSx), a series of FeMSx catalysts with tailorable protonation kinetics are obtained. The key intermediates behaviors traced by in situ FT-IR and Raman spectroscopy and operando electrochemical impedance spectroscopy demonstrate the strong protonation kinetics-dependent selectivity that mathematically follows a log-linear Bradley curve. Strikingly, FeCuSx exhibits a record-high selectivity of 75.05 % at −0.1 V (vs. RHE) for NH3 production in 0.1 M KOH electrolyte.
ABSTRACT
While higher selectivity of nitrogen reduction reaction (NRR) to ammonia (NH3) is always achieved in alkali, the selectivity dependence on nitrogen (N2) protonation and mechanisms therein are unrevealed. Herein, we profile how the NRR selectivity theoretically relies upon the first protonation that is collectively regulated by proton (H) abundance and adsorption-desorption, along with intermediate-*NNH formation. By incorporating electronic metal modulators (M=Co, Ni, Cu, Zn) in nitrogenase-imitated model-iron polysulfide (FeSx), a series of FeMSx catalysts with tailorable protonation kinetics are obtained. The key intermediates behaviors traced by in situ FT-IR and Raman spectroscopy and operando electrochemical impedance spectroscopy demonstrate the strong protonation kinetics-dependent selectivity that mathematically follows a log-linear Bradley curve. Strikingly, FeCuSx exhibits a record-high selectivity of 75.05 % at −0.1 V (vs. RHE) for NH3 production in 0.1 M KOH electrolyte.
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