Universität zu Köln

Witulski, Benedict ORCID: 0000-0002-1181-6203, Goyal, Naina ORCID: 0009-0002-6956-7905, Patrun, David ORCID: 0009-0004-2281-7676, Pires, Fabio ORCID: 0000-0001-6762-2910, Aytuna, Ziyaad ORCID: 0000-0003-4947-7603, Alaei, Hamed, Schiemann, Olav ORCID: 0000-0001-6346-9779 and Mathur, Sanjay ORCID: 0000-0003-2765-2693 (2025). Ag Cluster‐Modified K 0.5 Na 0.5 NbO 3 Piezocatalyst for Enhanced Electrochemical Dinitrogen Reduction Reaction. Advanced Engineering Materials, 27 (17). pp. 1-7. Wiley. ISSN 1438-1656

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Abstract

[Artikel-Nr.: 2500764] Efforts in finding alternatives to Haber–Bosch process for chemical synthesis of ammonia still struggle with efficient N 2 activation. Piezoelectric materials are promising cocatalysts to enhance the chemical kinetics of dinitrogen (N 2 ) reduction through, built‐in electric fields, upon mechanical activation, which can modulate the surface electrochemical potential. This work reports on the influence of piezoelectric potassium sodium niobate (K 0.5 Na 0.5 NbO 3 , KNN) as a lead‐free cocatalyst for the electrochemical nitrogen reduction reaction to ammonia (NH 3 ) under mild conditions, on a silver (Ag) catalyst. For piezoactivation, modified H‐cell is engineered with the working electrode (Ag/KNN), enabling external mechanical actuating during electrochemical process. The results demonstrate that transient dipoles generated on the KNN surface through localized electric field improve threefold NH 3 production (3.6 μg h −1 cm −2 ) and a Faradaic efficiency up to 75%. Piezoinfluence is investigated through actuation‐induced, linear sweep voltammetry, electrochemical impedance spectroscopy, chronoamperometry, and open‐circuit potential measurements.

Item Type:	Article
Creators:	Creators Email ORCID ORCID Put Code Witulski, Benedict UNSPECIFIED https://orcid.org/0000-0002-1181-6203 UNSPECIFIED Goyal, Naina UNSPECIFIED https://orcid.org/0009-0002-6956-7905 UNSPECIFIED Patrun, David UNSPECIFIED https://orcid.org/0009-0004-2281-7676 UNSPECIFIED Pires, Fabio UNSPECIFIED https://orcid.org/0000-0001-6762-2910 UNSPECIFIED Aytuna, Ziyaad UNSPECIFIED https://orcid.org/0000-0003-4947-7603 UNSPECIFIED Alaei, Hamed UNSPECIFIED UNSPECIFIED UNSPECIFIED Schiemann, Olav UNSPECIFIED https://orcid.org/0000-0001-6346-9779 UNSPECIFIED Mathur, Sanjay UNSPECIFIED https://orcid.org/0000-0003-2765-2693 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-801787
Identification Number:	10.1002/adem.202500764
Journal or Publication Title:	Advanced Engineering Materials
Volume:	27
Number:	17
Page Range:	pp. 1-7
Number of Pages:	7
Date:	4 September 2025
Publisher:	Wiley
ISSN:	1438-1656
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	Chemistry and allied sciences
Uncontrolled Keywords:	Keywords Language piezocatalysis ; piezo assisted electrochemical nitrogen reduction reaction ; piezo enhanced ammonia synthesis ; sol-gel, metal alkoxide English
['eprint_fieldname_oa_funders' not defined]:	Publikationsfonds UzK
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/80178