Fig xA Electrochemical performance in xA

3. Results and discussion
Fig. 1 shows the SEM and TEM images of a typical as-prepared sample-C850 (The SEM and TEM images of sample C650 and C750 are not shown here since they Sulfo-NHS-SS-Biotin are similar with C850). It mainly composed of vast irregular granules which results from the introduction of ball milling process after activation, and demonstrates uniform pore size distribution which confirmed the well-developed microporosity of the sample. Apparently, finer granularity and well-developed microstructure may be favorable to fast charge transfer and large charg