请问ORR中用什么方法来确定起始电位比较严谨?以下内容为一篇文章(Yang H B, Miao J, Hung S-F, et al. Identification of catalytic sites for oxygen reduction and oxygen evolution in N-doped graphene materials: Development of highly efficient metal-free bifunctional electrocatalyst [J]. Science Advances, 2016, 2(4): )中的阐述: The onset potentials were determined based on the starting of the linear region in Tafel plots. 相应的数据图和解释如下: Figure 3A reproduces the ORR polarization curves measured from the NGRW, which shows an onset potential and a half-wave potential (E1/2) of 0.92 and 0.84 V versus RHE (reversible hydrogen electrode), respectively. These values are very close to those of Pt/C (0.94 and 0.85 V), but much more positive than those of the N-HGS (0.90 and 0.81 V versus RHE) and N-GS (0.87 and 0.80 V versus RHE). 请问如何理解Tafel曲线线性区起始这一概念呢?Tafel区的线性关系不是在半对数坐标下得到的吗?查看更多5个回答 . 14人已关注