文献类型：期刊文献

英文题名：Hydrogel Network: A Dynamic Solution for Reversible Metal Ion Valence Switching

作者：He, Chun[1,2,3];Sun, Zhen[1,2,3];Xing, Mingyang[1,2,3];Lei, Juying[4];Ye, Ziwei[1,2,3];Wang, Lingzhi[1,2,3];Zhang, Jinlong[1,2,3]

机构：[1]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Joint Int Res Lab Precis Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Engn Res Ctr Multimedia Environm Catalysi, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：36

期号：7

起止页码：3316

外文期刊名：CHEMISTRY OF MATERIALS

收录：;EI(收录号：20241315803345);WOS:【SCI-EXPANDED(收录号:WOS:001189804300001)】；

基金：This study was supported by the National Key R&D Program of China (2021YFC2103500, 2022YFE0107900, 2022YFB3803600), National Natural Science Foundation of China (21972040, 21822603, and 21773062), the Science and Technology Commission of Shanghai Municipality (21ZR1417900, 22230780200, and 20DZ2250400), the Innovation Program of Shanghai Municipal Education Commission (2021-01-07-00-02-E00106), and the Fundamental Research Funds for the Central Universities (222201717003).

语种：英文

外文关键词：Electron transitions - Hydrogels - Iron compounds - Metal nanoparticles - Oxidation

摘要：Efficient electron transfer between metallic active centers and cocatalysts is vital for sustainable catalysis. This work demonstrates a strategy using the dynamic contraction-rebound of hydrogels to promote the valence switch of metal ions in Fenton reactions. The key is to utilize low-valent Fe(II) to cross-link an alginate hydrogel network embedded with reducing nanoparticles, forming a macroporous structure composed of domains centered around nanoparticles. The hydrogel contracts when Fe(III) forms upon introduction of an electron acceptor. This contraction facilitates electron transfer from nanoparticles to nearby Fe(III) and causes the network to rebound. The dynamic contraction-rebound process among adjacent domains promotes the overall reduction efficiency of Fe(III) within the hydrogel. This approach allows the flexible combination of different metal ion pairs with reducing nanoparticles. Moreover, this system can efficiently conduct Fenton oxidation of methane in a neutral environment under ambient conditions, achieving a significant 28-fold increase in activity compared to the nonassembled system.