Guo Haipeng, Wu Chang, Shu Chaozhu, Hu Zhe, Gebert Florian, Gu Qin-Fen, Konstantinov Konstantin, Sharma Shailendra Kumar, Marshall Aaron T, Yang Weishen, Chou Shu-Lei, Liu Hua-Kun, Wang Jia-Zhao
Institute for Superconducting & Electronic Materials (ISEM), University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW, 2522, Australia.
Chemical and Process Engineering, MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Canterbury, Christchurch, 8041, New Zealand.
Chemistry. 2024 Oct 1;30(55):e202304106. doi: 10.1002/chem.202304106. Epub 2024 Sep 17.
Sodium-oxygen batteries have been regarded as promising energy storage devices due to their low overpotential and high energy density. Its applications, however, still face formidable challenges due to the lack of understanding about the influence of electrocatalysts on the discharge products. Here, a phosphorous and nitrogen dual-doped carbon (PNDC) based cathode is synthesized to increase the electrocatalytic activity and to stabilize the NaO superoxide nanoparticle discharge products, leading to enhanced cycling stability when compared to the nitrogen-doped carbon (NDC). The PNDC air cathode exhibits a low overpotential (0.36 V) and long cycling stability (120 cycles). The reversible formation/decomposition and stabilization of the NaO discharge products are clearly proven by in-situ synchrotron X-ray diffraction and ex-situ X-ray diffraction. Based on the density functional theory calculation, the PNDC has much stronger adsorption (-2.85 eV) for NaO than that of NDC (-1.80 eV), which could efficiently stabilize the NaO discharge products.
钠氧电池因其低过电位和高能量密度而被视为有前景的储能装置。然而，由于对电催化剂对放电产物的影响缺乏了解，其应用仍面临巨大挑战。在此，合成了一种基于磷氮双掺杂碳（PNDC）的阴极，以提高电催化活性并稳定超氧化钠纳米颗粒放电产物，与氮掺杂碳（NDC）相比，循环稳定性得到增强。PNDC空气阴极具有低过电位（0.36 V）和长循环稳定性（120次循环）。原位同步辐射X射线衍射和非原位X射线衍射清楚地证明了超氧化钠放电产物的可逆形成/分解和稳定性。基于密度泛函理论计算，PNDC对超氧化钠的吸附（-2.85 eV）比NDC（-1.80 eV）强得多，这可以有效地稳定超氧化钠放电产物。
