Water Dissociation and Hydroxyl Formation on Ni(110)

Gerrard, N, Mistry, K, Darling, GR ORCID: 0000-0001-9329-9993 and Hodgson, A ORCID: 0000-0001-8677-7467 (2020) Water Dissociation and Hydroxyl Formation on Ni(110) Journal of Physical Chemistry C, 124 (43). pp. 23815-23822. ISSN 1932-7447, 1932-7455

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Abstract

Nickel is an active catalyst for hydrogenation and re-forming reactions, with the reactions showing a strong dependence on the surface exposed. Here, we describe the mixed hydroxyl-water phases formed during water dissociation on Ni(110) using scanning tunneling microscopy and low-current low-energy electron diffraction. Water dissociation starts between 150 and 180 K as the H-bond structure evolves from linear one-dimensional (1D) chains of intact water into a two-dimensional (2D) network containing short rows of face-sharing hexagonal rings. As further water desorbs, the hexagonal rows adopt a local (2 × 3) arrangement, forming small, disordered domains separated by strain relief features. Decomposition of this phase occurs near 220 K to form linear 1D structures consisting of flat, zigzag water chains, with each water stabilized by donating one H to hydroxyl to form a branched chain structure. The OH-H2O chains repel each other, with the saturation layer ordering into a (2 0, 1 4) structure that decomposes to OH near 245 K as further water desorbs. The structure of the mixed OH/H2O phases is discussed and contrasted with those found on the related Cu(110) surface, with the differences attributed to strain in the 2D H-bond network caused by the short Ni lattice spacing and strong bond to OH/H2O.

Item Type:	Article
Uncontrolled Keywords:	40 Engineering, 34 Chemical Sciences, 3406 Physical Chemistry
Depositing User:	Symplectic Admin
Date Deposited:	07 Oct 2020 15:00
Last Modified:	01 Mar 2026 04:58
DOI:	10.1021/acs.jpcc.0c08708
Open Access URL:	https://pubs.acs.org/doi/10.1021/acs.jpcc.0c08708
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3103689
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