B-Doped Graphene as Catalyst To Improve Charge Rate of Lithium鈥揂ir Battery

详细信息    查看全文

• 作者：Xiaodong Ren ; Jinzhen Zhu ; Fuming Du ; Jianjun Liu ; Wenqing Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 2, 2014
• 年：2014
• 卷：118
• 期：39
• 页码：22412-22418
• 全文大小：366K
• ISSN：1932-7455

文摘

The lithium鈥揳ir battery as an energy storage technology can be used in electric vehicles due to its large energy density, while its poor rate capability limits its practical usage under large current density. According to first-principles thermodynamics calculation, we predict B-doped graphene can be a potential catalyst to improve the charge rate of lithium鈥揳ir battery. The lowest-energy reaction pathway for oxygen evolution reaction (OER) is predicted as Li⁺ 鈫?Li⁺ 鈫?O₂. The rate-determining step (RDS) is predicted as the O₂ evolution step. B-doped graphene can reduce the RDS barrier by 0.40 eV, indicating that charge rate may be significantly improved. B-doping can increase charge transferring of Li₂O₂ to the substrate by 0.36 e^{鈥?/sup>, which helps to activate Li鈥揙 bonds and oxidize O₂2鈥?/sup> to O₂. We suggest a good OER catalytic substrate that can reduce the O₂ evolution barrier should show p-type surface behavior.}