Maksim Litskevich, Md Shafayat Hossain*, Yang Fu, Hu Miao, Yuxiao Jiang, Guangming Cheng, Pengcheng Chen, Qi Zhang, Zi-Jia Cheng, Raul Acevedo-Esteves, Christie Nelson, Haozhe Wang, Jose L. Gonzalez Jimenez, Brian Casas, Xiaoxiong Liu, Stepan S. Tsirkin, Kouta Dagnino, Songbo Zhang, Chia-Hsiu Hsu, Sen Shao, Shaogang Xu, Tyler A. Cochran, Xian P. Yang, Hu Xu, Jiaxin Yin, Yaroslav A. Gerasimenko, Weiwei Xie, Nan Yao, Luis Balicas, Guoqing Chang, Titus Neupert, Hechang Lei and M. Zahid Hasan*,
{"title":"","authors":"Maksim Litskevich, Md Shafayat Hossain*, Yang Fu, Hu Miao, Yuxiao Jiang, Guangming Cheng, Pengcheng Chen, Qi Zhang, Zi-Jia Cheng, Raul Acevedo-Esteves, Christie Nelson, Haozhe Wang, Jose L. Gonzalez Jimenez, Brian Casas, Xiaoxiong Liu, Stepan S. Tsirkin, Kouta Dagnino, Songbo Zhang, Chia-Hsiu Hsu, Sen Shao, Shaogang Xu, Tyler A. Cochran, Xian P. Yang, Hu Xu, Jiaxin Yin, Yaroslav A. Gerasimenko, Weiwei Xie, Nan Yao, Luis Balicas, Guoqing Chang, Titus Neupert, Hechang Lei and M. Zahid Hasan*, ","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"25 26","pages":"XXX-XXX 962–968"},"PeriodicalIF":9.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.5c01695","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144521922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Verda Saygin, Yihong Xu, Sean B. Andersson and Keith A. Brown*,
{"title":"","authors":"Verda Saygin, Yihong Xu, Sean B. Andersson and Keith A. Brown*, ","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"25 26","pages":"XXX-XXX 962–968"},"PeriodicalIF":9.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.5c02539","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144521911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nano LettersPub Date : 2025-07-02Epub Date: 2025-06-16DOI: 10.1021/acs.nanolett.5c02133
Rajat Sainju, Tianyu Li, Monia R Nielsen, Yuanyuan Zhu
{"title":"<i>Operando</i> Spatially and Time-Resolved Reduction of Hollow Polycrystalline NiO: How to Promote Ni Nanoparticle Redispersion.","authors":"Rajat Sainju, Tianyu Li, Monia R Nielsen, Yuanyuan Zhu","doi":"10.1021/acs.nanolett.5c02133","DOIUrl":"10.1021/acs.nanolett.5c02133","url":null,"abstract":"<p><p>Oxidation-reduction treatments are widely used to rejuvenate sintered metal catalysts, yet the specific role of the reduction step in driving nanocatalyst redispersion remains poorly understood. In this work, we present the first spatially and time-resolved <i>operando</i> study of Ni redispersion via in situ isothermal reduction of hollow, polycrystalline NiO at 400-600 °C in 1 bar 20%H<sub>2</sub>/N<sub>2</sub>. By combining in situ environmental transmission electron microscopy (ETEM) with tailored semantic segmentation, we extracted grain-level NiO reduction kinetics and found that a moderate 450 °C reduction slows and desynchronizes transformation across neighboring NiO grains─thereby promoting Ni fragmentation even from intermediate NiO morphologies not conducive to redispersion under high-temperature reduction. These new insights reveal the dual need of spatial separation (hollow oxide formation) and temporal offset (slower, asynchronous reduction) for effective metal redispersion, providing mechanistic guidance for the rational design of oxidation-reduction regeneration protocols.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":" ","pages":"10521-10527"},"PeriodicalIF":9.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144309287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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