Enhancing oxygen evolution reaction by cationic surfactants

查看全文 作　　者：Qixian [1]Xie;Daojin [1]Zhou;Pengsong [1]Li;Zhao [1]Cai;Tianhui [1]Xie;Tengfei [1]Gao;Ruida [1]Chen;Yun [1]Kuang;Xiaoming [1]Sun

机构地区：[1]State Key Laboratory of Chemical Resource Engineering,Beijing Advanced Innovation Center for Soft Matter Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Nano Research》索引2019年第12卷第9期,共5页

基　　金：This work was financially supported by the National Natural Science Foundation of China,the Program for Changjiang Scholars and Innovative Research Team in the University,the Fundamental Research Funds for the Central Universities,the Long-Term Subsidy Mechanism from the Ministry of Finance and the Ministry of Education of China,the National Key Research and Development Program of China(Nos.2016YFF0204402 and 2018YFB1502401). 摘　　要：Oxygen evolution reaction is critical for water splitting or metal-air batteries,but previous research mainly focuses on electrode material or structure optimization.Herein,we demonstrate that surfactant modification of a NiFe layered double hydroxide (LDH) array electrode,one of the best catalysts for oxygen evolution reaction (OER),could achieve superaerophobic surface with balanced surface charges,affording fast mass transfer,quick gas release,and boosted OER performance.The assembled surfactants on the electrode surface are responsible for lowering the bubble adhesive force (~ 1.03 μN) and corresponding fast release of small bubbles generated during OER.In addition,the bipolar nature of the hexadecyl trimethyl ammonium bromide (CTAB) molecule lead to bilayer assembly of the surfactants with the polar ends facing the electrode surface and the electrolyte,resulting in neutralized charges on the electrode surface.As a result,OH-transfer was facilitated and OER performance was enhanced.With the modified superaerophobic surface and balanced surface charge,NiFe LDHs-CTAB nanostructured electrode showed ultrahigh current density increase (9.39 mA(mV·cm^2)),2.3 times higher than that for conventional NiFe LDH nanoarray electrode),dramatically fast gas release,and excellent durability.The introduction of surfactants to construct under-water superaerophobic electrode with in-time repelling ability to the as-formed gas bubbles may open up a new pathway for designing efficient electrodes for gas evolution systems with potentially practical application in the near future. 关键词：SURFACTANT OXYGEN evolution reaction superaerophobicity BUBBLE RELEASE CHARGE balanee

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Enhancing oxygen evolution reaction by cationic surfactants

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