Alternative routes to NH3 and its application: general discussion

C. Richard A. Catlow, Joseph El-Kadi, Yeqin Guan, Justin S.J. Hargreaves, Patrick L Holland, Hideo Hosono, Mauricio Isaacs, Manpreet Kaur, Yoji Kobayashi, Douglas R. MacFarlane, Vineet Mishra, Pinkie Ntola, Muhammed Safeer N. K, Sergii I. Shylin, Samira Siahrostami, Carsten Sievers, Deep Lata Singh, Laura Torrente Murciano, Romain Tort, Shik Chi Edman TsangDeniz Uner, Kylie A. Vincent, Qianru Wang, Lukman Yusuf

Research output: Contribution to journalComment / DebateOtherpeer-review

Abstract

Mauricio Isaacs opened a general discussion of the paper by Samira Siahros-
tami: In electrochemical reduction of CO2 , it is known that each facet of copper is selective for one product. For nitrate reduction, is this effect also seen?

Samira Siahrostami replied: In our study (https://doi.org/10.1039/
d2fd00145h), we only looked at (111), a low index facet that is prominently
exposed in the crystal structure. Other facets would certainly show different
mechanisms and might show different selectivity. For example, the (100)
facet would be ineffective for nitrate reduction to ammonia because it
might promote N–N coupling (similar to C–C coupling in CO 2 reduction
reaction), resulting in byproducts such as N 2 and N 2 O and lowering
ammonia yield.

C. Richard A. Catlow asked: In work on CO2 activation, it has been shown that
alloy catalysts can be very effective. Have you explored their use in the catalytic
processes investigated in your paper?

Samira Siahrostami responded: We haven’t studied alloying yet. However, as is
mentioned in our paper, we suggested alloying as one strategy to improve the
activity of copper for nitrate reduction to ammonia.

Muhammed Safeer N. K. said: Under negative potential during nitrate reduc-
tion the catalyst undergoes transformation (even the single atom catalyst),
eventually aggregating to form metal nanoparticles. This deactivates the catalyst.
How can you avoid this aggregation of metal particles during nitrate reduction?
Original languageEnglish
Pages (from-to)549-556
Number of pages8
JournalFaraday Discussions
Volume243
DOIs
Publication statusPublished - 27 Jun 2023

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