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International Affairs Students Current Students Alumni Faculty/Staff Careers--> TOHOKU UNIVERSITYCREATING GLOBAL EXCELLENCE Search 日本語 Contact Tohoku University --> About Facts & Figures Facilities Organization Chart History President's Message Top Global University Project Designated National University Global Network Promotional Videos Academics Undergraduate Graduate Courses in English Exchange Programs Summer Programs Double Degree Programs Academic Calendar Syllabus Admissions Undergraduate Admissions Graduate Admissions Fees and Expenses Financial Aid Research Feature Highlights Research Releases University Research News Research Institutes Visitor Research Center Research Profiles Academic Research Staff Campus Life International Support Office IT Services Facilities Dining & Shops Campus Bus Clubs & Circles News University News Research--> Arts & Culture Health & Sports Campus & Community Press Release--> International Visit Alumni Careers Events Exhibits Music Special Event Lecture Alumni--> Map & Directions Campus Maps & Bus--> Facilities Map--> TOHOKUUNIVERSITY About Academics Admissions Research Campus Life News Events International Affairs Students Current Students Alumni Faculty/Staff Promotional Videos Subscribe to our Newsletter Map & Directions Contact Jobs & Vacancies Emergency Information Site Map 日本語 Close Home Research News Unraveling the pH-Dependent Oxygen Reduction Performance on Single-Atom Catalysts Research News Unraveling the pH-Dependent Oxygen Reduction Performance on Single-Atom Catalysts 2024-02-21 A group of researchers has answered some pressing questions regarding a new, promising class of catalysts known as single-atom catalysts (SACs). Their insights were featured as the cover article in the Journal of the American Chemical Society on January 12, 2024. Scientists have identified metal-nitrogen-carbon (M-N-C) SACs as efficient and cost-effective alternatives to platinum-based catalysts in critical applications such as fuel cells and batteries. Despite their promise, however, there are still several aspects of their behavior in the oxygen reduction reaction - a crucial process that occurs in various electrochemical systems - that are not well understood, such as their activity dependence on pH, selectivity for different electron transfer pathways, and the identification of rate-determining steps. The cover of our article which unveiled an interesting pH-dependent evolution in oxygen reduction reaction (ORR) activity volcanos for M--N--C single-atom catalysts. ©Hao Li et al. The group, which includes Hao Li, Associate Professor at Tohoku University's Advanced Institute for Materials Research (WPI-AIMR), delved deep into the intricacies of M-N-C catalysts, addressing fundamental questions that have long puzzled the scientific community. Through meticulous analysis of over 100 M-N-C catalyst structures and comprehensive energetic assessments spanning more than 2000 data sets, the researchers uncovered a pH-dependent evolution in the catalytic activity of these materials. Contrary to previous assumptions, the study revealed a nuanced response of M-N-C catalysts to varying pH levels, with some exhibiting remarkable stability and performance across acidic and alkaline environments. The research also highlighted the intricate interplay between the catalyst's composition and its performance, elucidating factors influencing selectivity for different reaction pathways. By synthesizing a diverse array of M-N-C catalysts and subjecting them to rigorous experimental testing, the team validated their theoretical predictions, affirming the accuracy of their models in predicting key catalytic parameters. The microkinetic ORR volcano models of M-N-C SACs and rate-determining analyses. ©Hao Li et al. "Our findings represent a significant milestone in the quest for efficient and sustainable catalytic materials," points out Li. "By unraveling the pH-dependence, selectivity, and versatility of M-N-C catalysts, we are paving the way for the development of next-generation catalysts with unprecedented performance and applicability." Given that pH dependence in electrocatalysis is very common, Li and his colleagues hope to extend this successful model to a variety of catalytic reactions moving forward. "We want to enhance the precision of catalytic theoretical models to enable better screening for high-performance and stable catalysts," adds Li. Experimental characterization, performance tests, and validations. a-e, Metal K-edge X-ray absorption near-edge structure (XANES) of the MPc/CNT, FePc/CNT-R, and M-COF366/CNT catalysts and their reference samples. ©Hao Li et al. Publication Details: Title: Unraveling the pH-Dependent Oxygen Reduction Performance on Single-Atom Catalysts: From Single- to Dual-Sabatier OptimaAuthors: Di Zhang, Zhuyu Wang, Fangzhou Liu, Peiyun Yi, Linfa Peng, Yuan Chen, Li Wei, and Hao LiJournal: Journal of the American Chemical SocietyDOI: 10.1021/jacs.3c11246 Contact: Hao Li, Advanced Institute for Materials Research (WPI-AIMR), Tohoku University Email: li.hao.b8tohoku.ac.jpWebsite: https://www.li-lab-cat-design.com/ --> Archives 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Page Top About Tohoku University Academics Admissions Research Campus Life News Events International Affairs Students Alumni Promotional Videos Subscribe to our Newsletter Map & Directions Contact Tohoku University Jobs & Vacancies Emergency Information Site Map Privacy Policy Media Enquiries Parent & Family Support Public Facilities Contact Tohoku University