Phosphorization of α-Fe₂O₃ boosts active hydrogen mediated electrochemical nitrate reduction to ammonia
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Author (Corporation)
Publication date
25.09.2024
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01A - Journal article
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Small
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Volume
20
Issue / Number
50
Pages / Duration
2406424
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Publisher / Publishing institution
Wiley
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Abstract
Inexpensive iron-based materials are considered promising electrocatalysts for nitrate (NO₃−) reduction, but their catalytic activity and spontaneous corrosion remain challenges. Here, the α-Fe₂O₃ active surface is reconstructed by gradient phosphorization to obtain FePₓ with higher electrochemical activity. FeP₂.₀ optimizes the adsorption energy of NO₃- and its reduction intermediates, meanwhile promote the generation of active hydrogen (*H) but inhibit its generation of H₂. More importantly, Fe and P can serve as binding sites for NO₃- and *H, respectively, which improves the electron utilization of NO₃- deoxygenation and the efficiency of the subsequent hydrogenation for the selective synthesis of NH₃. 91.7% NO₃- conversion rate is achieved for the reduction of 100 mL 200 mg L-¹ NO₃−−N, 99.3% ammonia (NH₃ selectivity (yield of 1.79 mg h−¹ cm−2), and 91.4% Faraday efficiency in 3 h. The high-purity solid NH₄Cl is finally extracted by gas extraction and vacuum distillation (81.4% recovery). This study provides new insights and strategies for the conversion of NO₃− to NH₃ products over iron-based electrocatalysts.
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1613-6810
1613-6829
1613-6829
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
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peer-reviewed
Open access category
Closed
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Citation
Hou, Z., Zhang, Y., Chen, H., Wang, J., Li, A., & Corvini, P. (2024). Phosphorization of α-Fe₂O₃ boosts active hydrogen mediated electrochemical nitrate reduction to ammonia. Small, 20(50), 2406424. https://doi.org/10.1002/smll.202406424