{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/115723"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/115723","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Development of complex metal oxide electrocatalysts for oxygen evolution reaction","abstract":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","abstract_html":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","abstract_has_math":false,"creators":["Zhang, Cheng"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical Engineering","degree_department":null,"school":null,"contributors":["Yang, Hong","Kenis, Paul J. A.","Zuo, Jian-Min","Su, Xiao"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-05","date_published":"2022-05","updated_at":"2026-07-22T22:24:55Z","subjects":["electrocatalysis","complex metal oxide","oxygen evolution reaction"],"languages":["en","eng"],"rights":["Copyright 2022 Cheng Zhang"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/115723","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Yang, Hong","Kenis, Paul J. A.","Zuo, Jian-Min","Su, Xiao"]},{"key":"dc:creator","label":"Author","values":["Zhang, Cheng"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-05","2022-04-20"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["electrocatalysis","complex metal oxide","oxygen evolution reaction"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2022 Cheng Zhang"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/115723"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","The student, Cheng Zhang, accepted the attached license on 2022-04-19 at 09:23.","The student, Cheng Zhang, submitted this Dissertation for approval on 2022-04-19 at 09:34.","This Dissertation was approved for publication on 2022-04-20 at 09:06.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17787 on 2022-11-11 at 12:47:22","Generating green hydrogen with water electrolysis is regarded as a promising solution to the climate and energy crisis. The major challenge of water splitting is to develop efficient electrocatalysts for oxygen evolution reaction (OER) with high activity, stability and low cost. But the lack of fundamental understanding in the OER mechanism limits the application of this technique at an industrial level. This dissertation focuses on: (1) Developing efficient OER electrocatalysts with different crystal structures; (2) Regulating the properties of catalysts by metal substitution or varying synthetic conditions to determine the dominated impacting factors on OER performance; (3) Developing novel characterization techniques to better understand the reaction mechanism of OER. Chapter 2 focuses on a Mn substituted pyrochlore Y2[MnxRu1-x]2O7 which exhibited an enhanced performance compared to reference catalysts RuO2 and Y2Ru2O7. The dominated impacting factor was determined to be the oxidation state of Ru. Chapter 3 presents a series of pyrochlore Ln2Ru2O7 with lanthanide metals as A-site metals. Ru-O bond length was found to be a descriptor for the OER performance. Secondary-ion mass spectrometry (SIMS) was applied to these catalysts, and a correlation between the metal-oxygen group and OER performance was discovered. Based on these results, an A-site synergy lattice oxygen mechanism was proposed for the first time. Chapter 4 shows the work about mixed B-site Ruddlesden-Popper Sr2(RuxIr1−x)O4¬, which shows high OER activity in acidic media, attributed to the high concentration of hydroxyl groups on the surface of the electrocatalysts. Chapter 5 is about the temperature dependent phase transition of perovskite SrCo0.9Fe0.1O3. As temperature increases, the crystal structure became amorphous structure, metal oxide, oxygen deficient perovskite and finally perovskite, The OER performance were tested in alkaline system, while the oxygen deficient perovskite shows highest activity, resulting from high ECSA, low impedance and the high concentration of oxygen vacancies. The results in this dissertation provide new insights towards the rational design of efficient OER catalysts and a better understanding of the reaction mechanism."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Development of complex metal oxide electrocatalysts for oxygen evolution reaction"]}]}],"canonical_facts":{"dc:contributor":["Yang, Hong","Kenis, Paul J. A.","Zuo, Jian-Min","Su, Xiao"],"dc:creator":["Zhang, Cheng"],"dc:date":["2022-05","2022-04-20"],"dc:description":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","The student, Cheng Zhang, accepted the attached license on 2022-04-19 at 09:23.","The student, Cheng Zhang, submitted this Dissertation for approval on 2022-04-19 at 09:34.","This Dissertation was approved for publication on 2022-04-20 at 09:06.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17787 on 2022-11-11 at 12:47:22","Generating green hydrogen with water electrolysis is regarded as a promising solution to the climate and energy crisis. The major challenge of water splitting is to develop efficient electrocatalysts for oxygen evolution reaction (OER) with high activity, stability and low cost. But the lack of fundamental understanding in the OER mechanism limits the application of this technique at an industrial level. This dissertation focuses on: (1) Developing efficient OER electrocatalysts with different crystal structures; (2) Regulating the properties of catalysts by metal substitution or varying synthetic conditions to determine the dominated impacting factors on OER performance; (3) Developing novel characterization techniques to better understand the reaction mechanism of OER. Chapter 2 focuses on a Mn substituted pyrochlore Y2[MnxRu1-x]2O7 which exhibited an enhanced performance compared to reference catalysts RuO2 and Y2Ru2O7. The dominated impacting factor was determined to be the oxidation state of Ru. Chapter 3 presents a series of pyrochlore Ln2Ru2O7 with lanthanide metals as A-site metals. Ru-O bond length was found to be a descriptor for the OER performance. Secondary-ion mass spectrometry (SIMS) was applied to these catalysts, and a correlation between the metal-oxygen group and OER performance was discovered. Based on these results, an A-site synergy lattice oxygen mechanism was proposed for the first time. Chapter 4 shows the work about mixed B-site Ruddlesden-Popper Sr2(RuxIr1−x)O4¬, which shows high OER activity in acidic media, attributed to the high concentration of hydroxyl groups on the surface of the electrocatalysts. Chapter 5 is about the temperature dependent phase transition of perovskite SrCo0.9Fe0.1O3. As temperature increases, the crystal structure became amorphous structure, metal oxide, oxygen deficient perovskite and finally perovskite, The OER performance were tested in alkaline system, while the oxygen deficient perovskite shows highest activity, resulting from high ECSA, low impedance and the high concentration of oxygen vacancies. The results in this dissertation provide new insights towards the rational design of efficient OER catalysts and a better understanding of the reaction mechanism."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/115723"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022 Cheng Zhang"],"dc:subject":["electrocatalysis","complex metal oxide","oxygen evolution reaction"],"dc:title":["Development of complex metal oxide electrocatalysts for oxygen evolution reaction"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Chemical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:55Z"}