Synthesis and Evaluation of Graphene Aerogel-Supported Mn(x)Fe(3-x)O(4) for Oxygen Reduction in Urea/O(2) Fuel Cells

石墨烯气凝胶负载的Mn(x)Fe(3-x)O(4)的合成与评价及其在尿素/O(2)燃料电池中氧还原的性能