Three identical methane digesters with working volumes

2.4. MFC setup and application
2.5. Measurement and analysis
3. Results and discussion
3.1. Characterisation of synthesized PEDOT
The FT-IR spectrum for the synthesized PEDOT was carried out to confirm the polymerisation of EDOT and uk101 illustrated in Fig. S2(a). Peaks at 1575 and 1463 cm−1 are attributed to CC and CC stretching vibrations of the heteroaromatic thiophene ring respectively (Li et al., 2011 and Wang et al., 2013). Peaks ranging from 1000 to 1300 cm−1 (1269, 1157, 1124 and 1070 cm−1) are indicative of COC bond in the dioxane group (Abdiryim et al., 2012 and Eren et al., 2012). The peaks around 995, 947 and 865 cm−1 signifies the presence of CS bonds present in the thiophene ring (Abdiryim et al., 2012).
The crystallographic analysis of the synthesized PEDOT is depicted in Fig. S2(b). The analysis reveals broad peaks that denotes the amorphous nature of synthesized PEDOT (Selvaganesh et al., 2007). The spectrum exhibits three distinct peaks at 2θ = 6.4°, 12.8° and 26°. The peak seen at 6.4° represents the reflection of the (1 0 0) polymer backbone with d-spacing of 13.9 Å ( Choi et al., 2004). As the d-spacing of 12.8° is 6.9 Å which is half of the (1 0 0) reflection, this peak corresponds to the (2 0 0) reflection of the polymer backbone. The peak ∼26° corresponds to (0 2 0) reflection.