BeeBet(ビーベット)解説✅登録方法【$10＋$30ボーナス】口コミ ...

This site uses Google Analytics to monitor site usage.Google Analytics uses COOKIEs to collect user information. View our COOKIE policy. Do not acceptAcceptGo To ContentHomeNewsEventsThemesAccessDonateJASearch MenuHomeHomeWho we areWho we areAbout usAbout usAbout usAcademic CalendarMessage from the PresidentQuestionnaireSite PolicyOfficial social media accountsThe UniversityFacts and FiguresVisionVisionVisionOur visionResearch: Working with society, for societyEducation: Thinking globallyInternational: Hub campusLocal Partnerships: Training for the futurePartner UniversitiesInternational OfficesInitiatives for SDGsThe Kobe University FundOur HistoryOur HistoryOur HistoryOur HistoryThe Kobe University FundThe Kobe University FundThe Kobe University FundThe Kobe University FundOrganization and University AdministrationOrganization and University AdministrationOrganization and University AdministrationExecutive membersContactKobe University DirectoryRules and RegulationsChartersChartersChartersCharter on EducationCharter on EnvironmentCharter on ResearchPublic RelationsPublic RelationsPublic RelationsPublic RelationsPublications - Back numbersPress Release ProcedureInformation DisclosureInformation DisclosureInformation DisclosureInternational ProgramsDistinctive Education and Research ProgramsCertified Evaluation and AccreditationLong-term Plan and Evaluation of the UniversityMission and GoalAcademic OrganizationTeaching StaffStudentsCurriculum, Standard for Grading System, Criteria for Graduation Completion of CourseEducation and Research Environments for StudentsTuition and FeesStudent SupportInternational ActivitiesStudying in JapanFor International StudentsUniversity Information and DisclosureCampusCampusCampusCampusStudy in KobeStudy in KobeAdmissionsAdmissionsAdmissionsAbout admissionsAdmission Policy of Kobe UniversityUndergraduate AdmissionsGraduate School Admissions - Master's programmesGraduate School Admissions - Doctoral programmesResearch StudentsExchange programsCourses in EnglishCourses in EnglishCourses in EnglishEnglish-Based Master's Program (MA, Graduate School of Science)ICHS Course (MA, PhD, Graduate School of Health Sciences)International Program for Medical Research (PhD, Graduate School of Medicine)Kobe Global Graduate Program for Agricultural Science (MA, PhD, Graduate School of Agricultural Science)Kobe University Interdisciplinary Master Program (KIMAP)SESAMI PhD Program (PhD, Graduate School of Business Administration)Special Course on Development Policy (MA, Graduate School of International Cooperation)CoursesCoursesCoursesAgricultural Engineering and Socio-Economics (Bachelor)Agricultural Engineering and Socio-Economics (Doctoral)Agricultural Engineering and Socio-Economics (Master)Agrobioscience (Bachelor)Agrobioscience (Doctoral)Agrobioscience (Master)Architecture (Bachelor)Architecture (Doctoral)Architecture (Master)Biology (Bachelor)Biology (Doctoral)Biology (Master)Biomedical Sciences (Master)Bioresource Science (Bachelor)Bioresource Science (Doctoral)Bioresource Science (Master)Business Administration (Bachelor)Business Administration (Doctoral)Business Administration (Master)Chemical Science and Engineering (Bachelor)Chemical Science and Engineering (Doctoral)Chemical Science and Engineering (Master)Chemistry (Bachelor)Chemistry (Doctoral)Chemistry (Master)Child Education (Bachelor)Computational Science (Doctoral)Computational Science (Master)Cultural Interaction (Doctoral)Cultural Interaction (Master)Culture and Globalization (Doctoral)Culture and Globalization (Master)Development and Economics Program (Doctoral)Development and Economics Program (Master)Economics (Bachelor)Economics (Doctoral)Economics (Master)Engineering, Civil (Bachelor)Engineering, Civil (Doctoral)Engineering, Civil (Master)Engineering, Computer and Systems (Bachelor)Engineering, Electrical and Electronic (Bachelor)Engineering, Electrical and Electronic (Doctoral)Engineering, Electrical and Electronic (Master)Engineering, Mechanical (Bacheloar)Engineering, Mechanical (Doctoral)Engineering, Mechanical (Master)Environment and Sustainability (Bachelor)Global Cultures (Bachelor)Global Transportation Sciences (Bachelor)Health Sciences (Bachelor)Health Sciences (Doctoral)Health Sciences (Master)Human Cultural Studies (Doctoral)Human Cultural Studies (Master)Human Development and Community (Bachelor)Human Development (Doctoral)Human Development (Master)Human Environmental Science (Doctoral)Human Environmental Science (Master)Human Social Dynamics (Doctoral)Human Social Dynamics (Master)Humanities (Bachelor)Information Science (Doctoral)Information Science (Master)International Law/Law and Development Program (Doctoral)International Law/Law and Development Program (Master)International Studies Program (Doctoral)International Studies Program (Master)Kobe University Interdisciplinary Master Program (KIMAP)Law (Bachelor)Law and Politics (Law - Master)Law and Politics (Law - Doctoral)Law and Politics (Political Science - Doctoral)Law and Politics (Political Science - Master)Marine Engineering (Bachelor)Maritime Sciences (Doctoral)Maritime Sciences (Master)Mathematics (Bachelor)Mathematics (Doctoral)Mathematics (Master)Medical Sciences (Doctoral)Medicine (Bachelor)Ocean Safety Systems Science (Bachelor)Physics (Bachelor)Physics (Doctoral)Physics (Master)Planetology (Bachelor)Planetology (Doctoral)Planetology (Master)Political Science and Area Studies Program (Doctoral)Political Science and Area Studies Program (Master)Science, Technology and Innovation (Doctoral)Science, Technology and Innovation (Master)Systems Science (Doctoral)Systems Science (Master)Short Term ProgramsShort Term ProgramsShort Term ProgramsShort Term ProgramsAcademic PolicyAcademic PolicyAcademic PolicyDiploma PolicyCurriculum PolicyStudy in JapanStudy in JapanStudy in JapanStudy in JapanProcedures for Entering JapanChange of Status of ResidenceExtension of Period of StayImmigration and Residence Procedures upon Arrival in JapanInviting Family Members to Japan and Necessary Procedures after their ArrivalLeaving Japan temporarily and Re-entryOrientation for New International StudentsWork Permit for Part-time JobsProcedure for Staying in JapanResidence Card ReissuanceInformation to report to the Immigration BureauResidence CardTemporary Withdrawal from UniversityCampus LifeCampus LifeAbout Kobe and HyogoAbout Kobe and HyogoAbout Kobe and HyogoAbout Hyogo PrefectureAbout Kobe CityTop 5 Must-see Attractions in KobeCampus GuideCampus GuideCampus GuideKobe University CafeteriasRegistered Tangible Cultural Properties in Kobe UniversityFacilities for Fitness and Extracurricular ActivitiesKobe University Medical Center for Student HealthInformation Science and Technology CenterKobe University Learning CommonsLearning Facilities and Relaxing EnvironmentsKobe University LibrariesStudent LifeStudent LifeStudent LifeClubs and Circles in Kobe UniversityDaily lifeStudent voicesAcademic CalendarAcademic CalendarAcademic CalendarAcademic CalendarTuition and FeesTuition and FeesTuition and FeesAbout TuitionAbout Enrollment Fee Exemption and DeferralAbout Tuition Fee ExemptionEnrollment Fee Exemption and Deferral Tuition Fee ExemptionStudent SupportStudent SupportStudent SupportStudent SupportHousing InformationHousing InformationHousing InformationHousing InformationKobe University Residential FacilitiesPrivate Dormitories and ResidencesRental Guarantor System at Kobe UniversityWhen moving outPrivate HousingScholarshipsScholarshipsScholarshipsScholarshipsPre-enrollment ScholarshipsCareersCareersCareersCareersInternshipsKobe University Tokyo Office - Career Centre, Tokyo BranchAlumniAlumniAlumniOverseas Alumni AssociationsKobe University Homecoming DayKobe University Community Network "KU-Net"Notice regarding the issuing of various certificates for graduatesResearch andCorporate RelationsResearch andCorporate RelationsResearch SupportResearch SupportResearch SupportResearch SupportAccommodationGrant Application Support in EnglishHandbook for international researchersSupport schemeCode of Conduct for ScientistsFunded Research ProgramsFunded Research ProgramsFunded Research ProgramsFunded Research ProgramsGrants-in-Aid for Scientific ResearchKobe University Strategic International Collaborative Research GrantDevelopment of a global-standard, minimally invasive, functional brain network mapping technique for brain surgeryEstablishing an Asian Network to develop a novel treatment for prostate cancerInternational consortium on ‘Mie-tronics’: a new emerging field of nanophotonicsInternational agricultural research platform for sustainable food productionIlluminating how huge earthquakes occur in Japan, Mexico and ChileCreating an international innovation hub for engineering biologyInternational membrane consortium on research and education strives for sustainable and carbon-neutral societiesInstitute of Promoting Academic Research ProgramsInstitute of Promoting Academic Research ProgramsInstitute of Promoting Academic Research ProgramsInstitute of Promoting Academic Research ProgramsOffice of Research ManagementOrganization for Advanced and Integrated ResearchResearch Facility Center for Science and TechnologyCollaborationCollaborationCollaborationCollaborationEnterprise Partnerships DivisionOffice of Promoting Regional PartnershipFaculties and SchoolsFaculties and SchoolsNewsNewsCategoryFeaturesInterviewsProjectsSpecial issuesPress releasesSDGsGoal 1: No povertyGoal 2: Zero hungerGoal 3: Good health and well-beingGoal 4: Quality educationGoal 5: Gender equalityGoal 6: Clean water and sanitationGoal 7: Affordable and clean energyGoal 8: Decent work and economic growthGoal 9: Industry, Innovation and InfrastructureGoal 10: Reduced inequalityGoal 11: Sustainable cities and communitiesGoal 12: Responsible consumption and productionGoal 13: Climate actionGoal 14: Life below waterGoal 15: Life on landGoal 16: Peace, justice and strong institutionsGoal 17: Partnership for the goalsAreasSocial sciencesMathematics and physicsChemistryEngineering sciencesInformaticsBiological sciencesAgriculture and EnvironmentMedicine, dentistry and pharmacologyHumanitiesEventsEventsEvent categoriesTalksOpen lecturesUniversity activitiesEvent areasSocial sciencesEvent locationsRokkodai 1st CampusOff-campusOnlineEvent audiencesStudentsAudienceProspective studentsCurrent studentsAlumsCorporate and societyFaculty and staff CloseNews TopCategoriesPress releasesRead in日本語2017.05.01Photocatalyst makes hydrogen production 10 times more efficient ChemistryNatural resources and energyHydrogen productionPhotocatalystMesocrystalsHydrogen is an alternative source of energy that can be produced from renewable sources of sunlight and water. A group of Japanese researchers has developed a photocatalyst that increases hydrogen production tenfold.The discovery was made by a joint research team led by Associate Professor TACHIKAWA Takashi (Molecular Photoscience Research Center, Kobe University) and Professor MAJIMA Tetsuro (Institute of Scientific and Industrial Research, Osaka University). Their findings were published on April 6 in the online version of Angewandte Chemie International Edition.When light is applied to photocatalysts, electrons and holes are produced on the surface of the catalyst, and hydrogen is obtained when these electrons reduce the hydrogen ions in water. However, in traditional photocatalysts the holes that are produced at the same time as the electrons mostly recombine on the surface of the catalyst and disappear, making it difficult to increase conversion efficiency.Professor Tachikawa’s research group developed a photocatalyst made of mesocrystal, deliberately creating a lack of uniformity in size and arrangement of the crystals. This new photocatalyst is able to spatially separate the electrons and electron holes to prevent them recombining. As a result, it has a far more efficient conversion rate for producing hydrogen than conventional nanoparticulate photocatalysts (approximately 7%).The team developed a new method called “Topotactic Epitaxial Growth” that uses the nanometer-sized spaces in mesocrystals. Based on this synthesis method they were able to synthesize strontium titanate (SrTiO3) from a compound with a different structure, titanium oxide (TiO2), using a simple one-step hydrothermal reaction. By lengthening the reaction time, they could also grow larger particles near the surface while preserving their crystalline structure.When they attached a co-catalyst to the synthesized mesocrystal and applied ultraviolet light in water, the reaction occurred with approximately 7% light energy conversion efficiency. Under the same conditions, SrTiO3 nanoparticles which had not been converted into mesocrystals reached a conversion efficiency of less than 1%, proving that the reaction efficiency increased tenfold under the mesocrystal structure. When each particle was examined under a fluorescent microscope, the team found that the electrons produced during the reaction gathered around the larger nanocrystals.When exposed to ultraviolet light, the electrons in this newly-developed photocatalyst move smoothly between the nanoparticles inside the mesocrystal, gather around the larger nanocrystals generated on the surface of the crystal, and efficiently reduce the hydrogen ions to create hydrogen.The discovery of this powerful photocatalyst started with the researchers’ idea to “deliberately break down the ordered structure of mesocrystals”, a concept that could be applied to other materials. The strontium titanate used this time is a cubic crystal, which means there is no variation in molecular adsorption or the reaction strength for each crystal plane. By regulating the size and spatial arrangement of the nanocrystals, which form the building blocks for this structure, it may be possible to greatly increase the light energy conversion efficiency of the existing system.Using these findings, the research group plans to apply mesocrystal technology to realizing the super-efficient production of hydrogen from solar energy. The perovskite metal oxides, including strontium titanate, the target of this study, are the fundamental materials of electronic elements, so their results could be applied to a wide range of fields.Figure 1. Synthesis of SrTiOmeso crystals by Topotactic Epitaxial GrowthUsing the spaces in mesocrystals, SrTiO3 mesocrystals are synthesized from TiO2 mesocrystals using a one-step hydrothermal process.Figure 2: The structure of SrTiO3 mesocrystals(a) Electron microscopy image of SrTiO3 mesocrystals obtained during a 24-hour hydrothermal reaction. The nanocrystals are arranged facing the same direction.(b) Electron microscopy image of SrTiO3 mesocrystals after 48-hours of hydrothermal reaction. The surface nanocrystals have grown in size. We can see that regardless of size and position, the nanocrystals forming the mesocrystal face the same direction.Figure 3: Water-splitting reaction under ultraviolet lightCompared to the SrTiO3 nanocrystals (black) which are mostly the same structure and size, the SrTiO3 mesocrystals (red) demonstrate a high water-splitting efficiency. Mixed-oxide of rhodium and chromium was used as the co-catalyst.Figure 4: SrTiO3 mesocrystal light emission(a)Light emission from SrTiO3 mesocrystals obtained in a 24-hour hydrothermal reaction. A weak light is seen equally throughout apart from the crystal edges.(b)Light emission from SrTiO3 mesocrystals obtained in a 48-hour hydrothermal reaction. They shine strongly due to the electrons gathered around the large crystals on the surface. The light emitted has a wavelength of 405nm.Figure 5: Hydrogen synthesis in SrTiO3 mesocrystals(a) The electrons produced under ultraviolet light move between the nanoparticles in the mesocrystal, gather around the comparatively large nanocrystals exposed on the surface, and reduce the hydrogen ions.(b) In the nanocrystals that aggregated with a disordered structure, most of the electrons and electron holes recombine and disappear, so the amount of hydrogen produced is low.Journal informationTitleTopotactic Epitaxy of SrTiO3 Mesocrystal Superstructures with Anisotropic Construction for Efficient Overall Water SplittingDOI10.1002/anie.201702223AuthorsPeng Zhang, Tomoya Ochi, Mamoru Fujitsuka, Yasuhiro Kobori, Tetsuro Majima, Takashi TachikawaJournalAngewandte Chemie International EditionResearchersTACHIKAWA TakashiProfessorMolecular Photoscience Research CenterKobori YasuhiroProfessorMolecular Photoscience Research CenterSDGs)">)">)">Molecular Photoscience Research CenterGraduate School of ScienceSHAREMore from these researchersPress releases2024.03.14ChemistryHow to upcycle low-energy lightPress releases2022.07.05Engineering sciencesNew photocatalytic membrane that can be cleaned using light energyPress releases2022.04.27ChemistryGreen technology breakthroughPress releases2020.11.13ChemistrySuccess in controlling the composition of perovskite ions paves the way for applying their flexibility to devicesMore about these topicsPress releases2020.11.18ChemistryFaster detection of photocatalyst-generated oxygen has big implications for clean energyPress releases2020.05.07ChemistryHighly efficient hydrogen gas production using sunlight, water and hematitePress releases2019.10.30ChemistryBreakthrough in clean energy productionPress releases2015.08.19ChemistryNew Insight into the Activation Mechanism of Photocatalystsページの先頭へ1-1, Rokkodai-cho, Nada-ku, Kobe, 657-8501, JAPANProspective studentsCurrent studentsAlumsCorporate and societyFaculty and staffContactAccessJobsOfficial social media accountsCampus calendarPrivacy policySite policySite map© Kobe University