| Investigation of the electrocatalytic effect of Ni-Fe-MOF (2) and its derived nanoporous carbon on HER and OER |
| کد مقاله : 1096-CNF |
| نویسندگان |
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پروانه صیادی *1، صدیقه زینلی2، صفیه مومنی3، مریم توحیدی2 1دانشکده فناوری های نوین،دانشگاه شیراز،شیراز، ایران 2دانشکده فناوری های نوین، دانشگاه شیراز، شیراز، ایران 3مرکز تحقیقات زیست فناوری دریایی خلیج فارس پژوهشکده علوم زیست پزشکی خلیج فارس دانشگاه علوم پزشکی بوشهر،بوشهر،ایران |
| چکیده مقاله |
| Investigation of the electrocatalytic effect of Ni-Fe-MOF (2) and its derived nanoporous carbon on HER and OER P. Sayadia*, S. Zeinalia, S. Momenib, M. Tohidia a Department of Nanochemical Engineering, Faculty of Advanced Technologies, Shiraz University, Shiraz, Iran b The Persian Gulf Marine Biotechnology Research Center, Bushehr University of Medical Sciences, Bushehr, Iran *Corrosponding author: parvaneh.sayadi@gmail.com Abstract With the increasing use of irrenewable energies, clean and renewable energies is required. So to achieve this goal, hydrogen is chosen. The electrochemical water splitting (HER and OER) is one of the ways to produce hydrogen energy [1]. Metal-organic frameworks (MOFs) can be excellent choices as an electrocatalyst due to the nanoporous framework to be able to reduce required overpotential [2]. Finding a low cost and high efficient electrocatalyst for producing hydrogen is very important. Therefore, in this work, Ni-Fe-MOF (2) was prepared by solvothermal method. In brief, a mixture of 2.7 g (9.8 mmol) of FeCl3.6H2O, 0.8234 g of H2BDC (4.9 mmol), 60 mL DMF, and a certain amount of Ni(NO3)2. 6H2O were sealed in a Teflon lined autoclave (100 mL) and heated at 110 °C for 20 h. Then it was washed with ethanol (3 h, 2 times) and DMF (30 min, 1 time) and dried (The molar ratios of Fe3+/Ni2+ was set as 1/2). Carbonization of Ni-Fe-MOF (2) was prepared as describe by Chen et al. [3]. The dried Ni-Fe-MOF (2) was put in to a boat and then placed into a tube furnace and heated to 600 °C with heating rate of 5 °C/min under nitrogen atmosphere and kept at this temperature for 5 h. The electrocatalytic performance of the catalysts was investigated on three electrode system that the glassy carbon (GC) modified with catalysts, Ag/AgCl electrode and the Pt wire were used as the working electrode, the reference electrode and the counter electrode, respectively in 1.0 M KOH and 1.0 M H2SO4 electrolyte for OER and HER, respectively. Fig. 1 (a, b) Shows the SEM images of Ni-Fe-MOF (2) and C- Ni-Fe-MOF (2). Ni-Fe-MOF (2) appears as a nano-porous polyhedral morphology (Fig. 1 (a)). Whereas, C- Ni-Fe-MOF (2) exhibits nanoparticles (Fig. 1(b)). The electrocatalytic activity of Ni-Fe-MOF (2) and C- Ni-Fe-MOF (2) for the HER and OER was investigated. Fig. 2 shows the linear sweep voltammetry (LSV) polarization curves and Tafel plot of Ni-Fe-MOF (2) and C- Ni-Fe-MOF (2). Tafel slop of Ni-Fe-MOF (2) and C-Ni-Fe-MOF (2) was 104 mV dec-1 and 124 mV dec-1, respectively. The overpotential of Ni-Fe-MOF (2) and C-Ni-Fe-MOF (2) at 10 mA cm-2 was 680 mV and 540 mV for HER. Also, the Tafel slop of Ni-Fe-MOF (2) was 61 mV dec-1 compared to 94 mV dec-1 for C-Ni-Fe-MOF (2). The overpotential of Ni-Fe-MOF (2) and C-Ni-Fe-MOF (2) at 10 mA cm-2 was 2.54 V and 1.64 V, respectively for OER process. In summary, the carbonization process can improve the OER and HER performance, and decrease the required overpotential. Fig.1. SEM images of (a) Ni-Fe-MOF (2), (b) C-Ni-Fe-MOF (2). Fig.2. HER polarization curves (LSV) (a) and the Tafel plots (b) of Ni-Fe-MOF (2) and C-Ni-Fe-MOF (2), and OER polarization curves (LSV) (c) and the Tafel plots (d) of Ni-Fe-MOF (2) and C-Ni-Fe-MOF (2). Keywords: MOFs, Carbonization, Electrocatalyst, HER, OER. Reference (1) Yunmei, D.; Zijian, L.; Yanru, L.; Yu, Y.; Lei, W. Applied Surface Science. 2018, 1081,1086. (2) Cuijuan, X.; Zongkai, P.; Kedong, X.; Jie, W.; Weiping, X.; Wen, L.; Mingxing, G.; Ting, H.; Deli, W. Electrochimica Acta. 2017, 423,432. (3) Wei, C.; Zhian, Z.; Weizhai, B.; Yanqing, L.; Jie, L.; Yongqing, G.; Jianjun, W. Electrochimica Acta. 2014, 293,301. |
| کلیدواژه ها |
| MOFs, Carbonization, Electrocatalyst, HER, OER. |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |