Highly Dispersed In‐Situ Grown Bi2O3 Nanosheets on Ti3C2Tx MXene for Selective Electroreduction of Nitrate to Ammonia. Issue 1 (13th December 2022)

• Record Type: Journal Article
• Authors: Zhang, Hao‐Yu; Li, Lan‐Xin; Sun, Wu‐Ji; He, Jing‐Hui; Xu, Qing‐Feng; Lu, Jian‐Mei
• Is Part Of: ChemElectroChem. Volume 10:Issue 1(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-13
• Subjects: ammonia -- Bismuth oxide -- Electroreduction -- Mxene -- Nitrate; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202201001
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Nitrate, a common pollutant in water, can be used as a nitrogen source for electrocatalytic ammonia production. Bismuth oxide (Bi2 O3 ) is a promising electrocatalyst because of earth‐abundance and high hydrogen overpotential. However, it also has the disadvantages of easy agglomeration and poor charge transfer. This study demonstrated that the high dispersion of Bi2 O3 nanosheets can be achieved through in‐situ growth on Ti3 C2 Tx MXene nanosheets that improved the efficiency of charge transmission, and thus improving the electrocatalytic ammonia production performance. A NH3 yield rate of ∼7.00 mg h −1 cm −2 with faradic efficiency of 91.1 % could be achieved on 11 % Bi2 O3 /MXene. Density functional theory (DFT) calculations, electrochemical active surface area (ECSA) and electrochemical impedance spectroscopy (EIS) proved that the excellent ammonia production performance came from the fact that bismuth oxide itself could inhibit hydrogen evolution, and in situ growth on MXene enabled high active site exposure and enhanced charge transfer capacity. Abstract : Go nanosheets ! High dispersion of Bi2 O3 nanosheets could be achieved through in‐situ growth on Ti3 C2 Tx MXene nanosheets, which improved the efficiency of charge transmission. Thus, the electrocatalytic ammonia production performance was improved. A NH3 yield rate of ∼7.00 mg h −1 cm −2 with faradic efficiency of 91.1 % could be achieved on 11 % Bi2 O3 /MXene.