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Carbon nanoarchitectonics with 3D self-crumpled carbon structures induced by GO-assisted carbonization for enhanced oxygen evolution performance
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2022-06-22 , DOI: 10.1016/j.jallcom.2022.166005
YongZhi Wang , Yaoyao Xue , Qiang Lei , Jiawei Yang , Yuhua Xue , Shuling Shen , Zhihong Tang , Junhe Yang

In this paper, a three-dimensional (3D) self-crumpled carbon nanoarchitectonics has been synthesized by GO-assisted carbonization, where GO not only serves as a template but also as a catalyst for carbonization of glucose (GLC). It is revealed that dehydration condensation reaction between -OH of GLC and -COOH of GO induces the anchoring of GLC on the surface of GO under high temperature and acidic environment, and subsequently, the dehydration of GLC produces 5-hydroxymethylfurfural (5-HMF) and epitaxially polymerizes and carbonizes into a two-dimensional carbon along GO sheets. In this step, GO provides both nucleation sites and template for the directional polymerization and carbonization of GLC. Due to the catalytic effect of GO, the activation energy of polymerization of GLC is reduced from 114.0 KJ mol−1 to 89.25 KJ mol−1 after the addition of GO, and the composite is transformed from two-dimensional nanosheets to three-dimensional crumpled structure by the capillary force of water evaporation. Due to the unique graphene-like structure, high conductivity offered by GO after heat treatment and more C-O groups derived from GLC, CG-50 shows good electrocatalytic performance. The overpotential is only 438 mV vs. RHE at the current density of 10 mA cm−2, and the Tafel slope is 102 mV dec−1.



中文翻译:

由 GO 辅助碳化诱导的具有 3D 自皱碳结构的碳纳米结构可提高析氧性能

在本文中,通过 GO 辅助碳化合成了一种三维 (3D) 自皱缩碳纳米结构,其中 GO 不仅用作模板,而且还用作葡萄糖碳化 (GLC) 的催化剂。结果表明,GLC的-OH和GO的-COOH在高温和酸性环境下发生脱水缩合反应,导致GLC锚定在GO表面,随后GLC脱水生成5-羟甲基糠醛(5-HMF)。并沿GO片外延聚合并碳化成二维碳。在此步骤中,GO 为 GLC 的定向聚合和碳化提供了成核位点和模板。由于 GO 的催化作用,GLC 的聚合活化能从 114.0 KJ mol -1降低加入GO后达到89.25 KJ mol -1,复合材料通过水分蒸发的毛细管力从二维纳米片转变为三维皱褶结构。由于独特的类石墨烯结构、热处理后GO提供的高电导率以及来自GLC的更多CO基团,CG-50表现出良好的电催化性能。在 10 mA cm -2的电流密度下,过电位仅 438 mV vs. RHE,Tafel 斜率为 102 mV dec -1

更新日期:2022-06-22
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