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Title: Ir-Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111)

Abstract

The alteration of electrocatalytic surfaces with adatoms lead to structural and electronic modifications promoting adsorption, desorption, and reactive processes. This study explores the potentiostatic electrodeposition process of Ni onto polycrystalline Ir (Irpoly) and assesses the electrocatalytic properties of the resulting bimetallic surfaces. The electrodeposition resulted in bimetallic Ni overlayer (OL) structures and in combination with controlled thermal post-deposition annealing in bimetallic near-surface alloys (NSA). The catalytic oxygen evolution reaction (OER) activity of these two different Ni-modified catalysts is assessed and compared to a pristine, unmodified Irpoly. An overlayer of Ni on Irpoly showed superior performance in both acidic and alkaline milieu. The reductive annealing of the OL produced a NSA of Ni, which demonstrated enhanced stability in an acidic environment. The remarkable activity and stability improvement of Ir by Ni modification makes both systems efficient electrocatalysts for water oxidation. The roughness factor of Irpoly is also reported. With the amount of deposited Ni determined by inductively coupled plasma mass spectrometry (ICP-MS) and a degree of coverage (monolayer) in the dependence of deposition potential is established. The density functional theory (DFT) assisted evaluation of H adsorption on Irpoly enables determination of the preferred Ni deposition sites on the three low-index surfacesmore » (111), (110), and (100).« less

Authors:
 [1];  [2];  [3];  [1];  [4]; ORCiD logo [4];  [3];  [2];  [5]
  1. Technical Univ. Berlin (Germany)
  2. Fritz Haber Inst. of the Max Planck Society, Berlin (Germany)
  3. Max-Planck-Inst. für Eisenforschung GmbH, Dusseldorf (Germany)
  4. Univ. of Wisconsin, Madison, WI (United States)
  5. Technical Univ. Berlin (Germany); Gwangju Inst. of Science and Technology (Korea, Republic of)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Org.:
Center for Nanoscale Materials (CNM) at the Argonne National Laboratory; the National Energy Research Scientific Computing Center (NERSC)
OSTI Identifier:
1495194
Grant/Contract Number:  
FG02-05ER15731
Resource Type:
Accepted Manuscript
Journal Name:
Surfaces
Additional Journal Information:
Journal Volume: 1; Journal Issue: 1; Journal ID: ISSN 2571-9637
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Oxygen evolution reaction; iridium; nickel; electrodeposition; model catalyst; water oxidation; CO oxidation; DFT; hydrogen adsorption

Citation Formats

Özer, Ebru, Sinev, Ilya, Mingers, Andrea M., Araujo, Jorge, Kropp, Thomas, Mavrikakis, Manos, Mayrhofer, Karl J. J., Cuenya, Beatriz Roldan, and Strasser, Peter. Ir-Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111). United States: N. p., 2018. Web. doi:10.3390/surfaces1010013.
Özer, Ebru, Sinev, Ilya, Mingers, Andrea M., Araujo, Jorge, Kropp, Thomas, Mavrikakis, Manos, Mayrhofer, Karl J. J., Cuenya, Beatriz Roldan, & Strasser, Peter. Ir-Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111). United States. doi:10.3390/surfaces1010013.
Özer, Ebru, Sinev, Ilya, Mingers, Andrea M., Araujo, Jorge, Kropp, Thomas, Mavrikakis, Manos, Mayrhofer, Karl J. J., Cuenya, Beatriz Roldan, and Strasser, Peter. Fri . "Ir-Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111)". United States. doi:10.3390/surfaces1010013. https://www.osti.gov/servlets/purl/1495194.
@article{osti_1495194,
title = {Ir-Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111)},
author = {Özer, Ebru and Sinev, Ilya and Mingers, Andrea M. and Araujo, Jorge and Kropp, Thomas and Mavrikakis, Manos and Mayrhofer, Karl J. J. and Cuenya, Beatriz Roldan and Strasser, Peter},
abstractNote = {The alteration of electrocatalytic surfaces with adatoms lead to structural and electronic modifications promoting adsorption, desorption, and reactive processes. This study explores the potentiostatic electrodeposition process of Ni onto polycrystalline Ir (Irpoly) and assesses the electrocatalytic properties of the resulting bimetallic surfaces. The electrodeposition resulted in bimetallic Ni overlayer (OL) structures and in combination with controlled thermal post-deposition annealing in bimetallic near-surface alloys (NSA). The catalytic oxygen evolution reaction (OER) activity of these two different Ni-modified catalysts is assessed and compared to a pristine, unmodified Irpoly. An overlayer of Ni on Irpoly showed superior performance in both acidic and alkaline milieu. The reductive annealing of the OL produced a NSA of Ni, which demonstrated enhanced stability in an acidic environment. The remarkable activity and stability improvement of Ir by Ni modification makes both systems efficient electrocatalysts for water oxidation. The roughness factor of Irpoly is also reported. With the amount of deposited Ni determined by inductively coupled plasma mass spectrometry (ICP-MS) and a degree of coverage (monolayer) in the dependence of deposition potential is established. The density functional theory (DFT) assisted evaluation of H adsorption on Irpoly enables determination of the preferred Ni deposition sites on the three low-index surfaces (111), (110), and (100).},
doi = {10.3390/surfaces1010013},
journal = {Surfaces},
number = 1,
volume = 1,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
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Figures / Tables:

Figure 1 Figure 1: Double‐layer capacitance measurements of (a) Ir(111) and (b) Irpoly displaying the anodic charging current densities measured at 0.42 VRHE.

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