1. Key
Lab of Bioelectrochemistry and Environmental Analysis of Gansu, College
of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People’s Republic of China
2. Department
of Chemistry, San Diego State University, San Diego, California 92182-1030, United States
3. School
of Physical Science and Technology, Lanzhou University, Lanzhou, Gansu 730000, People’s Republic of China