Investigation of Water Dissociation and Surface Hydroxyl Stability on Pure and Ni-Modified CoOOH by Ambient Pressure Photoelectron Spectroscopy

Chen, Zhu; Kronawitter, Coleman X.; Waluyo, Iradwikanari; Koel, Bruce E.

doi:10.1021/acs.jpcb.7b06960

Title: Investigation of Water Dissociation and Surface Hydroxyl Stability on Pure and Ni-Modified CoOOH by Ambient Pressure Photoelectron Spectroscopy

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Abstract

Water adsorption and reaction on pure and Ni-modified CoOOH nanowires were investigated using ambient pressure photoemission spectroscopy (APPES). The unique capabilities of APPES enable us to observe water dissociation and monitor formation of surface species on pure and Ni-modified CoOOH under elevated pressures and temperatures for the first time. Over a large range of pressures (UHV to 1 Torr), water dissociates readily on the pure and Ni-modified CoOOH surfaces at 27 °C. With an increase in H₂O pressure, a greater degree of surface hydroxylation was observed for all samples. At 1 Torr H₂O, ratios of different oxygen species indicate a transformation of CoOOH to CoO_xH_y in pure and Ni-modified CoOOH. In temperature dependent studies, desorption of weakly bound water and surface dehydroxylation were observed with increasing temperature. In conclusion, larger percentages of surface hydroxyl groups at higher temperatures were observed on Ni-modified CoOOH compared to pure CoOOH, which indicates an increased stability of surface hydroxyl groups on these Ni-modified surfaces.

Authors:

Chen, Zhu ^[1]; Kronawitter, Coleman X. ^[2]; Waluyo, Iradwikanari ^[3];

^[1]

Princeton Univ., NJ (United States). Dept. of Chemical and Biological Engineering
Univ. of California, Davis, CA (United States). Dept. Chemical Engineering
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II), Photon Science Division

Publication Date:: Thu Sep 07 00:00:00 EDT 2017

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1413926

Report Number(s):: BNL-114448-2017-JA
Journal ID: ISSN 1520-6106; TRN: US1800587

Grant/Contract Number:: SC0012704

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry

Additional Journal Information:: Journal Volume: 122; Journal Issue: 2; Journal ID: ISSN 1520-6106

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Chen, Zhu, Kronawitter, Coleman X., Waluyo, Iradwikanari, and Koel, Bruce E. Investigation of Water Dissociation and Surface Hydroxyl Stability on Pure and Ni-Modified CoOOH by Ambient Pressure Photoelectron Spectroscopy.  United States: N. p., 2017. 
Web.  doi:10.1021/acs.jpcb.7b06960.

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                    Chen, Zhu, Kronawitter, Coleman X., Waluyo, Iradwikanari, & Koel, Bruce E. Investigation of Water Dissociation and Surface Hydroxyl Stability on Pure and Ni-Modified CoOOH by Ambient Pressure Photoelectron Spectroscopy.  United States.  https://doi.org/10.1021/acs.jpcb.7b06960

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                    Chen, Zhu, Kronawitter, Coleman X., Waluyo, Iradwikanari, and Koel, Bruce E. Thu .  
"Investigation of Water Dissociation and Surface Hydroxyl Stability on Pure and Ni-Modified CoOOH by Ambient Pressure Photoelectron Spectroscopy".  United States.  https://doi.org/10.1021/acs.jpcb.7b06960.  https://www.osti.gov/servlets/purl/1413926.

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@article{osti_1413926,

  title        = {Investigation of Water Dissociation and Surface Hydroxyl Stability on Pure and Ni-Modified CoOOH by Ambient Pressure Photoelectron Spectroscopy},

  author       = {Chen, Zhu and Kronawitter, Coleman X. and Waluyo, Iradwikanari and Koel, Bruce E.},

  abstractNote = {Water adsorption and reaction on pure and Ni-modified CoOOH nanowires were investigated using ambient pressure photoemission spectroscopy (APPES). The unique capabilities of APPES enable us to observe water dissociation and monitor formation of surface species on pure and Ni-modified CoOOH under elevated pressures and temperatures for the first time. Over a large range of pressures (UHV to 1 Torr), water dissociates readily on the pure and Ni-modified CoOOH surfaces at 27 °C. With an increase in H2O pressure, a greater degree of surface hydroxylation was observed for all samples. At 1 Torr H2O, ratios of different oxygen species indicate a transformation of CoOOH to CoOxHy in pure and Ni-modified CoOOH. In temperature dependent studies, desorption of weakly bound water and surface dehydroxylation were observed with increasing temperature. In conclusion, larger percentages of surface hydroxyl groups at higher temperatures were observed on Ni-modified CoOOH compared to pure CoOOH, which indicates an increased stability of surface hydroxyl groups on these Ni-modified surfaces.},

  doi          = {10.1021/acs.jpcb.7b06960},

  journal      = {Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry},

  number       = 2,

  volume       = 122,

  place        = {United States},

  year         = {Thu Sep 07 00:00:00 EDT 2017},

  month        = {Thu Sep 07 00:00:00 EDT 2017}

}

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