Tang Jing, Meng Hui Min, Ji Mei Yang
School of Mechanical Engineering, Liaoning Shihua University Fushun 113001 China
Corrosion and Protection Center, Institute for Advance Materials and Technology, University of Science and Technology Beijing No. 30, Xueyuan Road, Haidian District Beijing 100083 China +86 024 56860273.
RSC Adv. 2019 Aug 9;9(43):24816-24821. doi: 10.1039/c9ra02993a. eCollection 2019 Aug 8.
γ-MnO, which is commercially used as an electrode material in batteries, is produced using large amounts of energy and leads to the production of high pollution as a secondary product. Ideally, this material should be fabricated by energy efficient, non-polluting methods at a reasonable cost. This study reports the green fabrication of γ-MnO into a gas diffusion electrode with Pt-free catalysts in acid solution. Cobalt oxide nanoparticles were deposited on few-layer graphene sheets produced a simple sintering and ultrasonic mixing method, leading to the fabrication of cobalt oxide/few-layer graphene. CoO nanoparticles are irregularly shaped and uniformly distributed on the surface of the few-layer graphene sheets. Characterization was conducted by X-ray diffraction, X-ray photoelectron spectroscopy, and field emission scanning electron microscopy. Electrochemical characterization revealed the performance of cobalt oxide/few-layer graphene gas diffusion electrode in an electrolyte of 120 g L manganese sulfate + 30 g L sulfuric acid at 100 A m at 80 °C. The cobalt oxide/few-layer graphene gas diffusion electrode exhibited a lower cell voltage of 0.9 V and higher electric energy savings of approximately 50% compared with traditional cathodes (copper and carbon).
γ-二氧化锰在商业上用作电池的电极材料，其生产过程消耗大量能源，并且作为副产品会产生高污染。理想情况下，这种材料应以合理成本通过节能、无污染的方法制造。本研究报道了在酸性溶液中用无铂催化剂将γ-二氧化锰绿色制备成气体扩散电极。通过简单的烧结和超声混合方法将氧化钴纳米颗粒沉积在少层石墨烯片上，从而制备出氧化钴/少层石墨烯。氧化钴纳米颗粒形状不规则，均匀分布在少层石墨烯片的表面。通过X射线衍射、X射线光电子能谱和场发射扫描电子显微镜进行表征。电化学表征揭示了氧化钴/少层石墨烯气体扩散电极在120 g/L硫酸锰 + 30 g/L硫酸的电解液中于80℃、100 A/m²时的性能。与传统阴极（铜和碳）相比，氧化钴/少层石墨烯气体扩散电极的电池电压较低，为0.9 V，电能节省率约高50%。
