Atomic layer deposition of multi-component catalyst systems for the oxygen evolution reaction
Abstract/Contents
- Abstract
- Development of catalysts for the OER continues to be a research priority with the aim of improving the efficiency of electrochemical water splitting. One of the best classes of catalysts for the OER in alkaline electrolytes is based on doped nickel oxyhydroxides. In this dissertation, atomic layer deposition (ALD) was utilized to synthesize model catalyst systems for research. First, the role of iron in nickel oxyhydroxide catalysts will be discussed. ALD was used to perform surface-directed modification of nickel oxyhydroxide catalysts. ALD of iron oxide on these nickel oxyhydroxide catalysts was found to deposit iron on the surface without modifying the bulk nickel properties. Through this selective deposition, an iron-doped nickel oxyhydroxide surface was found to be the active site motif required for high OER activity. Second, the role of aluminum as a dopant will be discussed. ALD was utilized to synthesize well-defined, ultra-thin nickel-aluminum oxide films. A study was performed to understand the growth behavior of ALD nickel-aluminum oxide. Nucleation effects of ALD aluminum oxide on surfaces prepared by ALD nickel oxide was found to be the dominant effect resulting in non-constant growth per cycle. With the knowledge obtained in the growth behavior studies, well-defined nickel-aluminum oxide films were deposited for catalysis. To form the final catalyst, an electrochemical conditioning procedure was employed to convert the as-deposited oxide films to the active oxyhydroxide catalyst. Turnover frequencies (TOFs) were determined for each catalyst, and it was found that the highest performing electrocatalysts were the films containing nickel, aluminum and iron, confirming that aluminum exerts a promotion effect on nickel oxyhydroxide catalysts. For the thinnest films, aluminum doping improved the TOF of nickel-iron oxyhydroxide catalysts by over 300%
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2020; ©2020 |
| Publication date | 2020; 2020 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Baker, Jonathan Grant |
|---|---|
| Degree supervisor | Bent, Stacey |
| Thesis advisor | Bent, Stacey |
| Thesis advisor | Cargnello, Matteo |
| Thesis advisor | Jaramillo, Thomas Francisco |
| Degree committee member | Cargnello, Matteo |
| Degree committee member | Jaramillo, Thomas Francisco |
| Associated with | Stanford University, Department of Chemical Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Jonathan G. Baker |
|---|---|
| Note | Submitted to the Department of Chemical Engineering |
| Thesis | Thesis Ph.D. Stanford University 2020 |
| Location | electronic resource |
Access conditions
- Copyright
- © 2020 by Jonathan Grant Baker
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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