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Xiaohui Deng, Yongpeng Yang, Lei Wang, Xian‐Zhu Fu, Jing‐Li Luo
Electrochemical nitrate reduction (NITRR) offers a promising alternative toward nitrogen recycling and ammonia production under ambient conditions, for which highly active and selective electrocatalyst is desired. In this study, metallic cobalt nanoarrays as facilely prepared from the electrochemical reduction of Co(OH)2 nanoarrays (NAs) are demonstrated to exhibit unprecedented NH3 producing capability from catalyzing NITRR. Benefitting from the high intrinsic activity of Co0, intimate contact between active species and conductive substrate and the nanostructure which exposes large number of active sites, the Co‐NAs electrode exhibits current density of −2.2 A cm−2 and NH3 production rate of 10.4 mmol h−1 cm−2 at −0.24 V versus RHE under alkaline condition and significantly surpasses reported counterparts. Moreover, the close‐to‐unity (≥96%) Faradaic efficiency (FE) toward NH3 is achieved over wide application range (potential, NO3− concentration and pH). Density function theory calculation reveals the optimized adsorption energy of NITRR intermediates on Co surface over Co(OH)2. Furthermore, it is proposed that despite the sluggish kinetics of Volmer step (H2O → *H + *OH) which provides protons in conventional hydrogenation mechanism, the proton‐supplying water dissociation process on Co surface is drastically facilitated following a concerted water dissociation–hydrogenation pathway.
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Deng, X., Yang, Y., Wang, L., Fu, X., & Luo, J. (2021). Metallic Co Nanoarray Catalyzes Selective NH3 Production from Electrochemical Nitrate Reduction at Current Densities Exceeding 2 A cm−2. Advanced Science, 8(7), 2004523. https://doi.org/10.1002/advs.202004523
Deng, Xiaohui, et al. "Metallic Co Nanoarray Catalyzes Selective NH3 Production from Electrochemical Nitrate Reduction at Current Densities Exceeding 2 A cm−2." Advanced Science, vol. 8, no. 7, 2021, pp. 2004523, https://doi.org/10.1002/advs.202004523.
Deng, Xiaohui, Yongpeng Yang, Lei Wang, Xian‐Zhu Fu, and Jing‐Li Luo. "Metallic Co Nanoarray Catalyzes Selective NH3 Production from Electrochemical Nitrate Reduction at Current Densities Exceeding 2 A cm−2." Advanced Science 8, no. 7 (2021): 2004523. https://doi.org/10.1002/advs.202004523.
Deng X., Yang Y., Wang L. [и др.] Metallic Co Nanoarray Catalyzes Selective NH3 Production from Electrochemical Nitrate Reduction at Current Densities Exceeding 2 A cm−2 // Advanced Science. — 2021. — Vol. 8, № 7. — P. 2004523. — URL: https://doi.org/10.1002/advs.202004523
@article{deng2021metallic,
title = {{Metallic Co Nanoarray Catalyzes Selective NH3 Production from Electrochemical Nitrate Reduction at Current Densities Exceeding 2 A cm−2}},
author = {Xiaohui Deng and Yongpeng Yang and Lei Wang and Xian‐Zhu Fu and Jing‐Li Luo},
journal = {Advanced Science},
year = {2021},
volume = {8},
number = {7},
pages = {2004523},
doi = {10.1002/advs.202004523},
url = {https://doi.org/10.1002/advs.202004523}
}TY - JOUR AU - Deng, Xiaohui AU - Yang, Yongpeng AU - Wang, Lei AU - Fu, Xian‐Zhu AU - Luo, Jing‐Li TI - Metallic Co Nanoarray Catalyzes Selective NH3 Production from Electrochemical Nitrate Reduction at Current Densities Exceeding 2 A cm−2 JO - Advanced Science VL - 8 IS - 7 SP - 2004523 PY - 2021 DA - 2021/02/01 DO - 10.1002/advs.202004523 UR - https://doi.org/10.1002/advs.202004523 ER -
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