Ultrafast Joule heating synthesis of hierarchically porous graphene-based Co-N-C single-atom monoliths
作者机构：Advanced Catalytic Engineering Research Center of the Ministry of EducationState Key Laboratory for Chemo/Biosensing and Chemometricsand College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2022年第15卷第5期
页 面：3913-3919页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
基 金：H.L.F.acknowledges financial support from the National Natural Science Foundation of China(No.51902099) Hunan high-level talent gathering project(No.2019RS1021) Fundamental Research Funds for the Central Universities(No.531119200087)
主 题：Joule heating single atom catalysts hierarchically porous structure self-supporting film hydrogen evolution reaction
摘 要：Herein,we develop a transient heating-quenching strategy triggered by Joule heating for the synthesis of single-atom cobalt-and nitrogen-doped graphene materials with three-dimensional porous monolithic architecture(denoted as CoNG-JH).The ultrafast Joule heating procedure simultaneously enables the reduction of graphene oxide and the incorporation of metal and nitrogen atoms into the graphene matrix within 2-second ***,the transient quenching avoids the extended heating-induced atom aggregation,ensuring the rapid and stable dispersion of atomic-scale CoNx active sites in ***,the interconnected macropores and nanopores formed by the self-assembly of graphene sheets facilitate the unimpeded ion and gas transport during the catalytic *** used as an electrode for the hydrogen evolution reaction(HER),the fabricated free-standing CoNG-JH exhibits high catalytic activity and durability with a low overpotential of 106 mV at 10 mA·cm^(-2) and a small Tafel slope of 66 mV·dec^(-1) in 0.5 M H_(2)SO_(4) *** presented synthesis and design strategy open up a rapid and facile route for the manufacturing of single atom catalysts.
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