Performance evaluation of graphene oxide–MnO<sub>2</sub> nanocomposite for alkaline membrane fuel cell
Mushtaq Ahmed, Shahbaz Ahmad, Tahir Nawaz, M A Q Jehangir Durrani, Asghar Ali, Saim Saher, Muhammad Alam Zaib Khan, M. Egilmez, Ayesha Samreen, Faisal Mustafa
Abstract
Abstract The manganese dioxide/graphene oxide (MnO 2 /GO) nanocomposites were prepared from hydrothermally synthesized MnO 2 nanorods and graphene oxide. Electrocatalytic performance for the oxygen reduction reactions (ORR) of the fabricated MnO 2 /GO nanocomposites was evaluated using the rotating disk electrode (RDE) method. It is found that MnO 2 /GO nanocomposites deliver significantly enhanced performance compared to standalone MnO 2 and GO with current density and onset potential values of 5.1 mA/cm 2 and 0.93 V versus RHE, respectively. The alkaline membrane fuel cell (AMFC) characteristics were also studied. In particular, the single‐cell alkaline fuel cell stack with MnO 2 /GO nanocomposite as cathode loading produced a peak power density value of 82 mW/cm 2 . Our findings revealed great potential for MnO 2 /GO nanocomposites for their electrocatalytic performance and utilization in AMFC as the cathode. Namely, MnO 2 /GO achieved fuel cell functionalities that were comparable to the widely used commercial Pt/C. The enhanced electrochemical performance of MnO 2 /GO is attributed to the synergistic interaction between highly conductive GO sheets and active sites of MnO 2 nanorods. The commendable performance of MnO 2 /GO suggests that it can be used as electrocatalysts in alkaline fuel cell applications.