CoSe₂ nanorods are prepared through a hydrothermal approach and characterized by using various techniques to examine crystallinity, crystallite size, morphology, and defects present within. CoSe₂ is grafted on graphitic carbon nitride (g‐C₃N₄) for oxygen reactions in a non‐aqueous medium. Li−O₂ batteries are assembled in di‐methyl sulfoxide (DMSO) and investigated for charge‐discharge cycles at various current densities. The Li−O₂ battery with CoSe₂@g‐C₃N₄ delivers a discharge capacity of 2158 mAh g⁻¹ at a current density of 0.1 mA cm⁻². The charging potential of the Li−O₂ battery is reduced by 280 mV in a combination of CoSe₂ and g‐C₃N₄. Electrochemical impedance spectroscopy of the Li−O₂ battery shows that the charge‐transfer resistance of the CoSe₂ catalyst is reduced from 311 to 181 Ω by adding g‐C₃N₄. Tetra‐ethylene glycol dimethyl ether is also used as the electrolyte to ensure better performance in terms of the stability of the cell in comparison to the DMSO electrolyte. Upon illumination of solar light, without any redox mediator, the overpotential of the charging step can be reduced. Under solar light illumination, the charging potential plateau shows a reduction of 330 and 170 mV in CoSe₂ and CoSe₂@g‐C₃N₄ samples, respectively.

中文翻译：

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石墨化氮化碳上接枝的二硒化钴纳米棒：可充电Li-O2电池中氧气反应的协同催化剂

CoSe ₂纳米棒是通过水热法制备的，并通过使用各种技术来表征其结晶度，微晶尺寸，形态和内部缺陷。CoSe ₂接枝在石墨碳氮化物（g-C ₃ N ₄）上，用于在非水介质中进行氧反应。李-O ₂电池被组装在二甲基亚砜（DMSO），并研究了在不同的电流密度的充放电循环。具有CoSe ₂ @ g-C ₃ N ₄的Li-O ₂电池在0.1 mA cm ^-2的电流密度下的放电容量为2158 mAh g ^-1。在CoSe ₂和g-C ₃ N ₄的组合中，Li-O ₂电池的充电电势降低了280 mV 。Li-O ₂电池的电化学阻抗谱显示，通过添加g-C ₃ N ₄，CoSe ₂催化剂的电荷转移电阻从311降低到181Ω。与DMSO电解质相比，四甘醇二甲醚也可用作电解质，以确保在电池稳定性方面具有更好的性能。在没有任何氧化还原介体的情况下照射太阳光时，可以减少充电步骤的过电位。在太阳光照射下，在CoSe ₂和CoSe ₂ @ g-C ₃ N ₄样品中，充电电位平稳分别降低了330和170 mV 。