期刊
ACS ENERGY LETTERS
卷 7, 期 1, 页码 36-41出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c02104
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资金
- Villum Fonden, Villum Center for the Science of Sustainable Fuels and Chemicals (V-SUSTAIN) [9455]
- Innovationsfonden [9067-00010B]
- European Research Council (ERC) under the European 430 Union [741860]
- European Research Council (ERC) [741860] Funding Source: European Research Council (ERC)
The current density and ammonia formation rates were significantly improved by synthesizing high surface area Cu electrodes through hydrogen bubbling templating (HBT) on Ni foam substrates. Increasing the electrolyte salt concentration was found to enhance the stability of the system.
The lithium-mediated ammonia synthesis is so far the only proven electrochemical way to produce ammonia with promising faradaic efficiencies (FEs). However, to make this process commercially competitive, the ammonia formation rates per geometric surface area need to be increased significantly. In this study, we increased the current density by synthesizing high surface area Cu electrodes through hydrogen bubbling templating (HBT) on Ni foam substrates. With these electrodes, we achieved high ammonia formation rates of 46.0 +/- 6.8 nmol s(-1) cm(geo)(-2), at a current density of -100 mA/cm(g)(eo)(-2) at 20 bar nitrogen atmosphere and comparable cell potentials to flat foil electrodes. The FE and energy efficiency (EE) under these conditions were 13.3 +/- 2.0% and 2.3 +/- 0.3%, respectively. Additionally, we found that increasing the electrolyte salt concentration improves the stability of the system, which is attributed to a change of Li deposition and/or solid electrolyte interphase.
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