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Liquid-Phase Deposition Synthesis of ZIF-67-Derived Synthesis of Co3O4@TiO2 Composite for Efficient Electrochemical Water Splitting
Metals ( IF 2.9 ) Pub Date : 2021-03-04 , DOI: 10.3390/met11030420
Zaffar Ahmed Shaikh , Asif Ali Laghari , Oleg Litvishko , Valery Litvishko , Tatyana Kalmykova , Artur Meynkhard

In this article, a novel Co3O4@TiO2 composite is synthesized by applying two-step methods. ZIF-67 is synthesized and used as a template for the synthesis of the composite. The composite is designed by using the effective photocatalytic properties of Co3O4 and TiO2. The resulting synthesized composite is supposed to offer superior properties compared to their counterparts. The synthesized Co3O4@TiO2 composite is characterized by powder X-ray diffraction (PXRD), Brunauer–Emmet–Teller (BET), atomic force microscopy (AFM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical water splitting, including hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) studies on the Co3O4@TiO2 composite, is evaluated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) analysis in a 2M aqueous KOH electrolyte. The current generation stability of these samples is deliberated by chronoamperometric measurements. It is observed, from LSV results at a 1 mV/s scan rate, that metal oxides incorporated on other metal oxides have a higher current density and lower onset potential as compared to pure metal oxides. From the obtained results, it has become evident that synthesized studies on the Co3O4@TiO2 composite possess significant potential for electrochemical water splitting with the lowest onset potential, highest current density, better OER, and HER activity.

中文翻译:

ZIF-67的液相沉积合成法-用于高效电化学水分解的Co3O4 @ TiO2复合物的合成

本文采用两步法合成了一种新型的Co 3 O 4 @TiO 2复合材料。ZIF-67已合成,并用作合成复合材料的模板。利用Co 3 O 4和TiO 2的有效光催化性能设计了复合材料。所得到的合成复合材料与同类产品相比应具有优越的性能。合成的Co 3 O 4 @TiO 2复合材料的特征在于粉末X射线衍射(PXRD),Brunauer–Emmet–Teller(BET),原子力显微镜(AFM),扫描电子显微镜(SEM)和透射电子显微镜(TEM)。Co 3 O 4 @TiO 2的电化学水分解,包括析氢反应(HER)和析氧反应(OER)研究通过在2M的KOH水溶液中的循环伏安法(CV)和线性扫描伏安法(LSV)分析来评估复合材料。这些样品的电流产生稳定性通过计时电流法测量来确定。从LSV结果以1mV / s的扫描速率观察到,与纯金属氧化物相比,掺入其他金属氧化物上的金属氧化物具有更高的电流密度和更低的起始电势。从获得的结果可以看出,对Co 3 O 4 @TiO 2复合材料的合成研究具有显着的电化学水分解潜力,具有最低的起始电位,最高的电流密度,更好的OER和HER活性。
更新日期:2021-03-04
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