Sulfide found in wastewaters and industrial off-gases is a toxic and highly corrosive pollutant. The air-cathode fuel cell has great potential for simultaneous elemental sulfur (S₀) and electricity recoveries from sulfide. Here, manganese oxide (MnO_x) is in-situ synthesized on graphite felt (GF) surface in a solvothermal system at different ethanol/water (E/W) volume ratios, and the prepared MnO_x/GF composites are used as the anodes of air-cathode fuel cell for spontaneous sulfide electrochemical oxidation. The performance of these MnO_x/GF composite anodes is comprehensively evaluated in term of sulfide removal, sulfur recovery and electricity production efficiencies. The results show that the manganese oxide loading on the GF presents as MnO₂ at E/W ratio of 0/10. When the E/W ratio is greater than 3/7, the obtained manganese oxides are all Mn₃O₄ and its particle size and loading on the GF decrease with the increase of ethanol concentration. The Mn₃O₄/GF composite prepared at E/W ratio of 3/7 has a great potential in catalyzing the electrochemical oxidation of sulfide in the air-cathode fuel cell. Compared with GF, the Mn₃O₄/GF composite anode shortens the time for complete sulfide oxidation from 120 h to 60 h. Meanwhile, the sulfur recovery efficiency and coulombic efficiency are as high as 78.4% and 71.5%, respectively.

废水和工业废气中发现的硫化物是有毒的高腐蚀性污染物。空气阴极燃料电池具有极高的潜力，可同时使元素硫（S ₀）和从硫化物中回收电。在此，以溶剂/水（E / W）的体积比在溶剂热体系中的石墨毡（GF）表面上原位合成了氧化锰（MnO _x），并将制备的MnO _x / GF复合材料用作阳极。空气燃料电池用于自发硫化物电化学氧化的研究。这些MnO _x的性能/ GF复合阳极在硫化物去除，硫回收和发电效率方面得到了全面评估。结果表明，在E / W比为0/10时，GF上负载的锰氧化物以MnO _2的形式存在。当E / W比大于3/7时，得到的锰氧化物均为Mn ₃ O ₄，其粒径和在GF上的负载随乙醇浓度的增加而降低。以E / W比为3/7制备的Mn ₃ O ₄ / GF复合材料在催化空气阴极燃料电池中硫化物的电化学氧化方面具有很大的潜力。与GF相比，Mn ₃ O ₄/ GF复合阳极可将硫化物完全氧化的时间从120 h缩短至60 h。同时，硫的回收率和库仑效率分别高达78.4％和71.5％。