Carboxylated carbon nanotubes with high electrocatalytic activity for oxygen evolution in acidic conditions

作     者：Xin Zhang Wenqing Zhang Jianying Dai Mingzi Sun Jun Zhao Lifei Ji Lin Chen Fanlong Zeng Fengchun Yang Bolong Huang Liming Dai 

作者机构：Key Laboratory of Synthetic and Natural Functional Molecule Chemistry(Ministry of Education)College of Chemistry and Material ScienceNorthwest UniversityXi'anChina Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic UniversityKowloonHong Kong SARChina Centre of Advanced Carbon MaterialsSchool of Chemical EngineeringUniversity of New South WalesSydneyAustralia 

出 版 物：《InfoMat》 (信息材料（英文）)

年 卷 期：2022年第4卷第1期

页      面：130-141页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 081705[工学-工业催化] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：support from the Hydrogeological Survey Project of Huangshui River(No.DD20190331) We are also grateful for the partial support by Australian Research Council(DP 190103881 and FL 190100126) 

主　　题：acidic oxygen evolution carbon nanotubes carboxylation defect metal-free catalytic mechanism 

摘      要：Since most electrocatalysts for oxygen evolution reaction(OER),except for precious metal oxides RuO_(2) and IrO_(2),are unstable in harsh acidic solutions,it is highly desirable to develop high-performance OER electrocatalysts for acidic media,though it is still a big ***,we report a simple strategy to produce carboxyl-enriched multiwalled carbon nanotubes(COOH-MWNTs)that exhibit stable and high electrocatalytic activities for OER in acidic solutions,showing an overpotential at a current density of 10 mA cm^(–2) and a Tafel slope as low as of 265 mV and 82 mV dec^(–1),*** far as we are aware,these results represent the best OER performance for metal-free electrocatalysts,even comparable to those of RuO_(2) and IrO_(2).We have further revealed the catalytic mechanism,which involves one electron lose from the COOH-MWNTs catalyst at the beginning of the OER process to trigger H_(2)O molecule oxidation by forming peralcohol,followed by the recapture of one electron from water molecule to oxidize water and to recover the initial state for the COOH-MWNTs *** unravel of this new OER mechanism is important as it provides new insights into the crucial role of organic functional groups in electrocatalytic ***,the mechanistic understanding can be used to guide the design and development of novel metalfree catalysts for acidic OER electrocatalysis and beyond.