Enabling electrochemical N2 reduction to NH3 in the low overpotential region using non-noble metal Bi electrodes via surface composition modification

Jang, Youn Jeong; Choi, Kyoung-Shin

doi:10.1039/d0ta02550j

Enabling electrochemical N₂ reduction to NH₃ in the low overpotential region using non-noble metal Bi electrodes via surface composition modification

Journal Article · Mon Jul 06 00:00:00 EDT 2020 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/d0ta02550j· OSTI ID:1801875

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Univ. of Wisconsin, Madison, WI (United States); Univ. of Hanyang, Seoul (Korea, Republic of); OSTI
Univ. of Wisconsin, Madison, WI (United States)

The electrochemical N₂ reduction reaction (ENRR) that can produce NH₃ using water as the hydrogen source at ambient temperature and pressure can be an exciting alternative to the Haber–Bosch process. The major challenge for electrochemical NH₃ production is the competing hydrogen evolution reaction (HER), which seriously limits the faradaic efficiency (FE) for NH₃ production. To date, noble metal electrocatalysts that are inactive for the HER have mainly been investigated for the ENRR. Studies reporting a FE greater than 10% for NH₃ production using non-noble metal catalysts in the low overpotential region (E ≤ 0.2 V vs. RHE) are very rare. This study reports effective electrochemical surface modification strategies that drastically increase the ENRR activity of a non-noble Bi electrode in the low overpotential region and achieve a FE for NH₃ production as high as 13.2% at -0.2 V vs. RHE in pH 7.5 phosphate buffer. Finally, the effect of each of the surface modifications on the activity for the ENRR and the electrode stability during the ENRR were systematically elucidated, which may be used to develop general strategies to enhance the ENRR activities of other non-noble metal electrodes in the low overpotential region.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: SC0008707

OSTI ID:: 1801875

Alternate ID(s):: OSTI ID: 1637379

Journal Information:: Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 27 Vol. 8; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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