Yivlialin R, Bussetti G, Magagnin L, Ciccacci F, Duò L
Department of Physics, Politecnico di Milano, p.za Leonardo da Vinci 32, I-20133 Milano, Italy.
Phys Chem Chem Phys. 2017 May 31;19(21):13855-13859. doi: 10.1039/c7cp00481h.
In the currently accepted picture, when graphite is immersed and polarized in a diluted sulfuric acid electrolyte, the surface undergoes an invasive process due to the intercalation of solvated sulphate anions inside the crystal. The following evolution of CO, CO and O promotes the surface swelling and the growth of blisters. Here, we give evidence that the appearance of blisters affects the graphite surface as soon as the oxygen potential is reached, i.e. before the traditionally accepted anion intercalation stage, which instead is demonstrated slowing the blister development. These results suggest a new picture of the solvated anion intercalation in graphite with respect to the current interpretative model.
在当前被广泛接受的观点中，当石墨浸入稀硫酸电解质并发生极化时，由于溶剂化硫酸根阴离子插入晶体内部，其表面会经历一个侵蚀过程。随后产生的一氧化碳、二氧化碳和氧气促使表面膨胀并形成水泡。在此，我们证明水泡的出现一旦达到氧势就会影响石墨表面，即在传统上认为的阴离子插入阶段之前，而阴离子插入阶段实际上会减缓水泡的形成。这些结果相对于当前的解释模型，提出了一种关于石墨中溶剂化阴离子插入的新观点。
