用于水系多硫化物/碘化物氧化还原液流电池的高活性纳米结构CoS/CoS异质结电催化剂。
Highly active nanostructured CoS/CoS heterojunction electrocatalysts for aqueous polysulfide/iodide redox flow batteries.
作者信息
Ma Dui, Hu Bo, Wu Wenda, Liu Xi, Zai Jiantao, Shu Chen, Tadesse Tsega Tsegaye, Chen Liwei, Qian Xuefeng, Liu T Leo
机构信息
Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 200240, Shanghai, P. R. China.
The Department of Chemistry and Biochemistry, Utah State University, Logan, UT, 84322, USA.
出版信息
Nat Commun. 2019 Jul 29;10(1):3367. doi: 10.1038/s41467-019-11176-y.
Aqueous polysulfide/iodide redox flow batteries are attractive for scalable energy storage due to their high energy density and low cost. However, their energy efficiency and power density are usually limited by poor electrochemical kinetics of the redox reactions of polysulfide/iodide ions on graphite electrodes, which has become the main obstacle for their practical applications. Here, CoS/CoS heterojunction nanoparticles with uneven charge distribution, which are synthesized in situ on graphite felt by a one-step solvothermal process, can significantly boost electrocatalytic activities of I/I and S/S redox reactions by improving absorptivity of charged ions and promoting charge transfer. The polysulfide/iodide flow battery with the graphene felt-CoS/CoS heterojunction can deliver a high energy efficiency of 84.5% at a current density of 10 mA cm, a power density of 86.2 mW cm and a stable energy efficiency retention of 96% after approximately 1000 h of continuous operation.
水系多硫化物/碘化物氧化还原液流电池因其高能量密度和低成本而在可扩展储能方面具有吸引力。然而，它们的能量效率和功率密度通常受到多硫化物/碘化物离子在石墨电极上氧化还原反应较差的电化学动力学的限制，这已成为其实际应用的主要障碍。在此，通过一步溶剂热法在石墨毡上原位合成的具有不均匀电荷分布的CoS/CoS异质结纳米颗粒，可通过提高带电离子的吸收率和促进电荷转移，显著提高I/I和S/S氧化还原反应的电催化活性。具有石墨烯毡-CoS/CoS异质结的多硫化物/碘化物液流电池在10 mA cm的电流密度下可实现84.5%的高能量效率、86.2 mW cm的功率密度，并且在连续运行约1000小时后稳定的能量效率保持率为96%。
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