Missouri University of Science and Technology
Designing novel multinary transition metal selenides as high-efficiency oxygen evolution reaction electrocatalysts and investigating surface properties
Abstract
dc:description.abstract<p>”Water splitting has been widely considered to be an efficient way to generate sustainable and renewable energy resources in fuel cells, metal-air batteries and other energy conversion devices. Exploring efficient electrocatalysts to expedite the anodic oxygen evolution reaction (OER) is a crucial task that needs to be addressed to boost the practical application of water splitting. This research focuses on the identification of OER electrocatalysts by systematically designing non-stochiometric mixed transition metal-based selenide OER electrocatalysts through combinatorial electrodeposition and investigation of selenide-based naturally occurring minerals as effective OER electrocatalyst. Paper I describes the study of Ni-Fe-Co selenides as OER catalysts by combinatorial electrodeposition and the best composition (Ni<sub>0.25</sub>Fe<sub>0.68</sub>Co<sub>0.07</sub>)<sub>3</sub>Se<sub>4</sub> with the lowest overpotential. Paper II presents the exploration of Co-Ni-Cu selenide system through combinatorial electrodeposition of 66 different compositions as highly efficient OER electrocatalysts and the best quaternary (Co<sub>0.21</sub>Ni<sub>0.25</sub>Cu<sub>0.54</sub>)<sub>3</sub>Se<sub>2</sub> showing a similar crystal structure as its parent compound Cu<sub>3</sub>Se<sub>2</sub>. Paper III introduces the Fe-Co-Cu selenide system investigated through combinatorial electrodeposition, and the optimal quaternary is identified as (Fe<sub>0.48</sub>Co<sub>0.38</sub>Cu<sub>0.14</sub>)Se. Paper IV presents CuCo<sub>2</sub>Se<sub>4</sub> as high-efficiency bifunctional electrocatalyst for full water splitting and conducted DFT calculation of surface dependent OER activity on (100) and (111) facets. Paper V introduces the hydrothermal synthesis of naturally-occurring mineral Tyrrellite Cu(Co<sub>0.68</sub>Ni<sub>0.32</sub>)<sub>2</sub>Se<sub>4</sub> as highly-efficient OER electrocatalyst. Paper VI describes three naturally occurring copper selenides (Cu<sub>2</sub>Se, Cu<sub>3</sub>Se<sub>2</sub> and CuSe<sub>2</sub>) as OER electrocatalyst and performed DFT calculation to understand their catalytic activity trend”--Abstract, page iv.</p>
Degree
thesis:*- Name thesis:degree_name
- Ph. D. in Chemistry
- Grantor
- Missouri University of Science and Technology
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Cao, Xi
Subjects
dc:subject × 1Identifiers
dc:identifier.*- Repository record dc:identifier
- https://scholarsmine.mst.edu/doctoral_dissertations/3089
- OAI identifier oai:identifier
- oai:scholarsmine.mst.edu:doctoral_dissertations-4094