“…Some chemically modified electrodes have been reported (Yardım, Gülcan, & Sßentürk, 2013;Shang, Zhao, & Zeng, 2014;Zheng, Hu, Gan, Dang, & Hu, 2010;Bettazzi, Palchetti, Sisalli, & Mascini, 2006;Luque, Luque-Pérez, Ríos, & Valcárcel, 2000;Peng, Hou, & Hu, 2012;Kong, Shen, Yu, Wang, & Chen, 2010). However, the performance of some electrodes was still not enough good.…”