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Japanese About UsMissionWaseda Vision 150President’s MessageOrganizationHistoryWaseda at a glanceSocial MediaContact UsWASEDA DigestAdmissionsAdmissionsJapanese Language CoursesExchange &#038; Study Abroad ProgramsCampus ToursContact UsAcademicsListingsOnline Courses on edXResearchResearch Press ReleaseResearch ActivitiesResearcher DatabaseTop Global University ProjectTeaching Resource (Elsevier)Campus LifeStudent Contributor ArticlesEquality, Diversity &#038; InclusionHealth, Safety &#038; WellnessIntercultural ExchangeSportsResidential LifeVolunteeringLibraries &#038; MuseumsStudent CirclesScholarships and Student SupportAlumniCollaborationTop Global University Project: Waseda Goes GlobalLatest research and commentary on Covid-1910 Years Since the Tohoku Earthquake and TsunamiGiving StudentsAlumniParents &#038; GuardiansFaculty &#038; StaffMedia Academic ListingsContact UsCampus AccessEmergency Notice Accessibility &#038; CopyrightSitemapPrivacy PolicyMyWasedaSocial MediaEmploymentAnnual Plans・ReportsEquality, Diversity &#038; Inclusion Syllabus Search Researcher Database Waseda University Repository Seeds Database Waseda E-Resource Portal Cultural Resource Database Announcements Mar 28, 2024 Schedule for Spring 2024 entrance ceremonies Mar 21, 2024 Schedule for Spring 2024 graduation ceremonies Dec 12, 2023 Spring 2024 graduation and entrance ceremonies Sep 19, 2023 Schedule for Autumn 2023 Entrance Ceremonies Sep 7, 2023 Schedule for Autumn 2023 Graduation Ceremonies Waseda University 1-104 Totsukamachi, Shinjuku-ku, Tokyo, 169-8050, JAPAN About UsMissionWaseda Vision 150President’s MessageOrganizationHistoryWaseda at a glanceSocial MediaContact UsWASEDA DigestAdmissionsAdmissionsJapanese Language CoursesExchange &#038; Study Abroad ProgramsCampus ToursContact UsAcademicsListingsOnline Courses on edXResearchResearch Press ReleaseResearch ActivitiesResearcher DatabaseTop Global University ProjectTeaching Resource (Elsevier)Campus LifeStudent Contributor ArticlesEquality, Diversity &#038; InclusionHealth, Safety &#038; WellnessIntercultural ExchangeSportsResidential LifeVolunteeringLibraries &#038; MuseumsStudent CirclesScholarships and Student SupportAlumniCollaborationTop Global University Project: Waseda Goes GlobalLatest research and commentary on Covid-1910 Years Since the Tohoku Earthquake and TsunamiGive Emergencynotice About UsMissionWaseda Vision 150President’s MessageOrganizationHistoryWaseda at a glanceSocial MediaContact UsWASEDA DigestAdmissionsAdmissionsJapanese Language CoursesExchange &#038; Study Abroad ProgramsCampus ToursContact UsAcademicsListingsOnline Courses on edXResearchResearch Press ReleaseResearch ActivitiesResearcher DatabaseTop Global University ProjectTeaching Resource (Elsevier)Campus LifeStudent Contributor ArticlesEquality, Diversity &#038; InclusionHealth, Safety &#038; WellnessIntercultural ExchangeSportsResidential LifeVolunteeringLibraries &#038; MuseumsStudent CirclesScholarships and Student SupportAlumniCollaborationTop Global University Project: Waseda Goes GlobalLatest research and commentary on Covid-1910 Years Since the Tohoku Earthquake and TsunamiGive Emergencynotice Home News Share Copper-Indium Oxide: A Faster and Cooler Way to Reduce Our Carbon Footprint Wed, Jan 13, 2021 Tags Highlight Press Release Research Share Scientists set a record for the highest conversion rate of carbon dioxide at low temperatures with copper-modified indium oxide, signifying sustainable e-fuel   A chemical-looping version of the reverse water-gas shift reaction (RWGS-CL) can help convert CO2 to CO at much lower temperatures without undesirable byproducts, enabling a simple gas separationPicture courtesy: Yasushi Sekine from Waseda University With ever-worsening climate change, there is a growing need for technologies that can capture and use up the atmospheric CO2 (carbon dioxide) and reduce our carbon footprint. Within the realm of renewable energy, CO2-based e-fuels have emerged as a promising technology that attempts to convert atmospheric CO2 into clean fuels. The process involves production of synthetic gas or syngas (a mixture of hydrogen and carbon monoxide (CO)). With the help of the reverse water-gas shift (RWGS) reaction, CO2 is broken down into the CO necessary for syngas. While promising in its conversion efficiency, the RWGS reaction requires incredibly high temperatures (>700°C) to proceed, while also generating unwanted byproducts. To tackle these problems, scientists developed a modified chemical-looping version of the RWGS reaction that converts CO2 to CO in a two-step method. First, a metal oxide, used as an oxygen storage material, is reduced by hydrogen. Subsequently, it is re-oxidized by CO2, yielding CO. This method is free of undesirable byproducts, makes gas separation simpler, and can be made feasible at lower temperatures depending on the oxide chosen. Consequently, scientists have been looking for oxide materials that exhibit high oxidation-reduction rates without requiring high temperatures. In a recent study published in Chemical Science, scientists from Waseda University and ENEOS Corporation in Japan have revealed that a novel indium oxide modified with copper (Cu-In2O3) exhibits a record-breaking CO2 conversion rate of 10 mmolh-1g-1 at relatively modest temperatures (400–500°C), making it a frontrunner among oxygen storage materials required for low-temperature CO2 conversion. To better understand this behavior, the team investigated the structural properties of Cu-In oxide along with the kinetics involved in the chemical-looping RWGS reaction. The scientists carried out X-ray-based analyses and found that the sample initially contained a parent material, Cu2In2O5, which was first reduced by hydrogen to form a Cu-In alloy and indium oxide (In2O3) and then oxidized by CO2 to yield Cu-In2O3 and CO. X-ray data further revealed that it underwent oxidation and reduction during the reaction, providing the key clue to scientists. “The X-ray measurements made it clear that the chemically looped RWGS reaction is based on the reduction and oxidation of Indium which leads to the formation and oxidation of the Cu-In alloy,” explains Professor Yasushi Sekine of Waseda University, who led the study. The kinetics investigations provided further insights into the reaction. The reduction step revealed that Cu was responsible for the reduction of indium oxide at low temperatures, while the oxidation step showed that the Cu-In alloy surface preserved a highly reduced state while its bulk got oxidized. This allowed the oxidation to happen twice as quickly as that of other oxides. The team attributed this peculiar oxidation behavior to a rapid migration of negatively charged oxygen ions from the Cu-In alloy surface to its bulk, which assisted in the preferential bulk oxidation. The results have, quite expectedly, excited scientists about the future prospects of copper-indium oxides. “Given the current situation with carbon emission and global warming, a high-performance carbon dioxide conversion process is greatly desired. Although the chemically looped RWGS reaction works well with many oxide materials, our novel Cu-In-oxide here shows a remarkably higher performance than any of them. We hope that this will contribute significantly to reducing our carbon footprint and driving humankind towards a more sustainable future”, concludes Sekine.   Reference Authors: Jun-Ichiro Makiura1, Takuma Higo1, Yutaro Kurosawa1, Kota Murakami1, Shuhei Ogo1, Hideaki Tsuneki1, Yasushi Hashimoto1, Yasushi Sato2, and Yasushi Sekine1 Title of original paper: Fast oxygen ion migration in Cu-In-oxide bulk and its utilization for effective CO2 conversion at lower temperature Journal: Chemical Science DOI: 10.1039/d0sc05340f Affiliations:1) Department of Applied Chemistry, Waseda University; 2) ENEOS Links New method converts carbon dioxide to methane at low temperatures Related Articles Alumni : Engagement : 【Message from Graduates】Ayumi Yasuda: Emergency Officer at UNICEF Ethiopia Jun 12, 2024 Press Release : Research : Uncovering the Nature of Emergent Magnetic Monopoles Jun 12, 2024 Asia : Culture : Education : History : 【Yanai Initiative】Open Talk “Co-Reading Edo Supernatural and Medical Discourse through Asai Ryōi’s “The Peony Lantern.”” (June 21) Jun 10, 2024 Virtual Campus Tour Waseda Campus Toyama Campus Nishiwaseda Campus Tokorozawa Campus Social Media Instagram facebook X youtube LinkedIn Giving Your generosity can make a difference and bring rippling impact No matter the size, every single gift will make a difference in helping students afford an academic experience that will transform their lives, as well as promoting frontline research to resolve complex challenges of the world today. More About Giving Japanese About UsMissionWaseda Vision 150President’s MessageOrganizationHistoryWaseda at a glanceSocial MediaContact UsWASEDA DigestAdmissionsAdmissionsJapanese Language CoursesExchange &#038; Study Abroad ProgramsCampus ToursContact UsAcademicsListingsOnline Courses on edXResearchResearch Press ReleaseResearch ActivitiesResearcher DatabaseTop Global University ProjectTeaching Resource (Elsevier)Campus LifeStudent Contributor ArticlesEquality, Diversity &#038; InclusionHealth, Safety &#038; WellnessIntercultural ExchangeSportsResidential LifeVolunteeringLibraries &#038; MuseumsStudent CirclesScholarships and Student SupportAlumniCollaborationTop Global University Project: Waseda Goes GlobalLatest research and commentary on Covid-1910 Years Since the Tohoku Earthquake and TsunamiGiving StudentsAlumniParents &#038; GuardiansFaculty &#038; StaffMedia Academic ListingsContact UsCampus AccessEmergency Notice Accessibility &#038; CopyrightSitemapPrivacy PolicyMyWasedaSocial MediaEmploymentAnnual Plans・ReportsEquality, Diversity &#038; Inclusion Syllabus Search Researcher Database Waseda University Repository Seeds Database Waseda E-Resource Portal Cultural Resource Database Announcements Mar 28, 2024 Schedule for Spring 2024 entrance ceremonies Mar 21, 2024 Schedule for Spring 2024 graduation ceremonies Dec 12, 2023 Spring 2024 graduation and entrance ceremonies Sep 19, 2023 Schedule for Autumn 2023 Entrance Ceremonies Sep 7, 2023 Schedule for Autumn 2023 Graduation Ceremonies Waseda University 1-104 Totsukamachi, Shinjuku-ku, Tokyo, 169-8050, JAPAN

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