{"created":"2023-09-25T02:10:26.936859+00:00","id":2000116,"links":{},"metadata":{"_buckets":{"deposit":"2334ec61-c5fe-423f-8874-10862305460d"},"_deposit":{"created_by":18,"id":"2000116","owner":"14","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"2000116"},"status":"published"},"_oai":{"id":"oai:kyutech.repo.nii.ac.jp:02000116","sets":["6:7"]},"author_link":[],"item_20_date_granted_61":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2022-09-26"}]},"item_20_degree_grantor_59":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"九州工業大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"17104","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_20_degree_name_58":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）"}]},"item_20_description_30":{"attribute_name":"目次","attribute_value_mlt":[{"subitem_description":"1. Introduction||2. Bimetal heterojunction FexSy/WS2 nanosheets electrocatalyst for energy-saving HER and water-splitting||3. Development bifunctional quinary NiFeCoMnCu high entropy alloy electrocatalyst for alkalic OER and HER||4. Bifunctional NiFeCoMnCu HEAs for electrochemical alkaline seawater splitting","subitem_description_language":"en","subitem_description_type":"TableOfContents"}]},"item_20_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Hydrogen evolution from electrochemical water-splitting is recognized as an effective and sustainable approach to producing hydrogen. Up to now, Ru and Pt-based electrocatalysts display superior oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities and long-term stability. However, the high price and rare reserve on the earth limit their large-scale usage. In this thesis, we developed a series of non-noble transition multimetallic electrocatalysts. As we expected, the prepared electrocatalysts exhibited excellent both HER and OER activities. In addition, as the bifunctional electrocatalysts, the prepared electrocatalysts displayed outstanding electrochemical water-splitting activity and excellent electrocatalytic stability.\n In chapter 1, the mechanism of OER and HER during the electrochemical water-splitting process, and the current development of transition metal electrocatalysts for OER and HER were introduced. In chapter 2, a novel bimetallic heterojunction FexSy/WS2 nanosheets (FexSy/WS2 Ns) were prepared through interface engineering technology. The prepared FexSy/WS2 Ns had an 8 nm thickness and a large diameter of ~1 μm. The FexSy/WS2 Ns exhibited excellent HER activity with an overpotential of 118 mV at 10 mA cm-2 and a low Tafel slope of 87 mV dec-1. In addition, by replacing OER with the urea oxidation reaction (UOR), the FexSy/WS2 Ns as a bifunctional electrocatalyst could achieve energy-saving water-splitting process, in which the applied voltage could be decreased with147 mV.\nIn chapter 3, to further increase the electrocatalytic activity, we developed a series of nonnoble transition metal electrocatalysts of unary Ni, binary NiFe, ternary NiFeCo, quaternary NiFeCoMn, and quinary NiFeCoMnCu by a facile critic acid chelating method. All the electrocatalysts had been used as the bifunctional electrocatalysts to test the OER and HER activities. As the result, the NiFeCoMnCu high entropy alloys (NiFeCoMnCu HEAs) displayed excellent OER and HER activity with an overpotential of 240 mV and 165 mV at 10 mA cm-2 respectively.\nIn chapter 4, a high-efficiency overall electrochemical water-splitting process was enabled by the prepared NiFeCoMnCu HEAs electrocatalyst through a two-electrode system. During the water-splitting process, the NiFeCoMnCu HEAs electrocatalyst only required 1.53 V to reach 10 mA cm-2. Meanwhile, almost 10 h continuous water-splitting process confirmed that the NiFeCoMnCu HEAs had an excellent stability. In addition, an electrochemical seawater-splitting reaction could also be enabled by the NiFeCoMnCu HEAs electrocatalyst with a current density of 10.5 mA cm-2 at 1.8 V for a continuous 10 h reaction process.\nFinally, the general conclusions of this thesis and the further prospects were summarized. The strategy of mixing different active metal elements into one single electrocatalyst would provide a better solution for developing more multifunctional electrocatalysts. It is also the point we will focus on in the future.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_20_description_5":{"attribute_name":"備考","attribute_value_mlt":[{"subitem_description":"九州工業大学博士学位論文 学位記番号：生工博甲第445号 学位授与年月日：令和4年9月26日","subitem_description_type":"Other"}]},"item_20_description_60":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_description":"令和4年度","subitem_description_type":"Other"}]},"item_20_dissertation_number_62":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第445号"}]},"item_20_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.18997/0002000116","subitem_identifier_reg_type":"JaLC"}]},"item_20_text_34":{"attribute_name":"アドバイザー","attribute_value_mlt":[{"subitem_text_value":"馬, 廷麗"}]},"item_20_version_type_63":{"attribute_name":"出版タイプ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Chen, Hanlin","creatorNameLang":"en"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2023-09-25"}],"filename":"sei_k_445.pdf","filesize":[{"value":"3.8 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://kyutech.repo.nii.ac.jp/record/2000116/files/sei_k_445.pdf"},"version_id":"750abcf0-a2a0-4d39-b214-5e15fdd83ab3"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Water-splitting","subitem_subject_scheme":"Other"},{"subitem_subject":"OER","subitem_subject_scheme":"Other"},{"subitem_subject":"HER","subitem_subject_scheme":"Other"},{"subitem_subject":"Electrocatalysts","subitem_subject_scheme":"Other"},{"subitem_subject":"Seawater-splitting","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"Development of Non-noble Multimetal-electrocatalysts and Application to Water-splitting Reaction","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Development of Non-noble Multimetal-electrocatalysts and Application to Water-splitting Reaction","subitem_title_language":"en"},{"subitem_title":"非貴金属系の多金属電気化学触媒の開発及び水分解反応への応用","subitem_title_language":"ja"}]},"item_type_id":"20","owner":"18","path":["7"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-09-25"},"publish_date":"2023-09-25","publish_status":"0","recid":"2000116","relation_version_is_last":true,"title":["Development of Non-noble Multimetal-electrocatalysts and Application to Water-splitting Reaction"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2024-08-05T08:31:04.147095+00:00"}