| Graphite as an electrode additive for inhibition of hydrogen evolution in the anode of zinc-air battery |
| کد مقاله : 1012-CNF |
| نویسندگان |
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مهسا حاج هادیان *1، محمد ژیانی1، محمد محمدی تقی آبادی2 1گروه آموزشی شیمی فیزیک، دانشکده شیمی، دانشگاه صنعتی اصفهان، اصفهان، ایران 2گروه آموزشی شیمی فیزیک ، دانشکده علوم پایه ، دانشگاه تربیت مدرس ، تهران ، ایران |
| چکیده مقاله |
| In order to save energy, metal-air batteries are a very good option among which zinc-air batteries are the most suitable due to the availability of raw materials, low cost, and high energy density. Zinc-air battery is a currently-old battery technology but has attracted revived interest recently. With larger storage capacity at a fraction of the cost compared to lithium-ion, zinc-air batteries clearly represent one of the most viable future options to powering electric vehicles. However, some technical problems associated with them have yet to be resolved, including the problem with the anode [1]. The Zn/ZnO standard reduction potential (-1.26V vs standard hydrogen electrode (SHE)) at pH 14 is below that of the hydrogen-evolution reaction (HER) (reaction (1), -0.83 V vs SHE at pH 14). Therefore, hydrogen evolution is thermodynamically favored, and a zinc electrode at rest will be corroded (reaction (2), referred to as self-discharge in a battery context) over time [2]. H_2 O+2e^-→2〖oH〗^-+H_(2 ) (1) Zn+2H_2 O→ZnO+H_(2 ) (2) Metals that have less overpotential than hydrogen should be used to reduce the evolution of hydrogen. In this study, we investigated the effect of graphite addition to anode of Zn-air battery to reduce the hydrogen evolution reaction. Adding 20wt% graphite to the zinc electrode on a carbon paper substrate significantly reduces the HER. The results can be seen according to the tafel plot (Fig.1) |
| کلیدواژه ها |
| Zinc-air battery, Graphite, Overpotential, Zinc electrode, Hydrogen evolution. |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |