Exploring energy storage devices and hydrogen evolution reaction electrode materials with high efficiency electrocatalytic activity, high energy density and low cost has broad prospects, but there are still huge challenges. Compared with traditional energy storage devices, supercapacitors (SCs) are a new type of energy storage device with broad development prospects. However, their practical application is significantly limited by the energy density of electrode materials. The practical application of hydrogen evolution reaction (HER) is limited by the high cost and scarcity of Pt-based precious metal catalysts. It is essential to develop materials with stable structure, low cost and abundant reserves. Here, in this paper, CoS and CoSe composites embedded in carbon nanofibers (CNFs) (expressed as CoS-CoSe/CNFs) were synthesized by electrospinning combined with in-situ growth Zeolite Imidazolate Framework-67 strategy, carbonization and subsequent selenium sulfide process. When employed as the positive material in supercapacitors, a specific capacitance of 292.2 F g is achieved at a current density of 1 A g. The specific capacitance of asymmetric supercapacitors (ASCs) assembled with CoS-CoSe/CNFs-5 as positive materials remains stable with no significant change observed in specific capacitance even after undergoing 10,000 cycles. At the same time, when a current density of 10 mA cm is applied in a 0.5 M HSO electrolyte solution, an overpotential reading of 189 mV is observed. The evidence mentioned above showcases the significant capacity of this substance for application in electrochemical energy storage and conversion.

中文翻译：

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在碳纳米纤维上生长的 CoS2-CoSe2 杂化纳米粒子作为超级电容器和析氢反应的电极

探索高效电催化活性、高能量密度和低成本的储能装置和析氢反应电极材料具有广阔的前景，但仍面临巨大的挑战。与传统储能装置相比，超级电容器（SC）是一种具有广阔发展前景的新型储能装置。然而，它们的实际应用受到电极材料能量密度的极大限制。析氢反应（HER）的实际应用受到铂基贵金属催化剂的高成本和稀缺性的限制。开发结构稳定、成本低廉、储量丰富的材料至关重要。本文通过静电纺丝结合原位生长沸石咪唑框架-67策略、碳化和随后的硫化硒工艺合成了嵌入碳纳米纤维（CNF）中的CoS和CoSe复合材料（表示为CoS-CoSe/CNF）。当用作超级电容器的正极材料时，在1 A g的电流密度下可实现292.2 F g的比电容。以CoS-CoSe/CNFs-5为正极材料组装的非对称超级电容器（ASC）的比电容保持稳定，即使经过10,000次循环后比电容也没有观察到明显变化。同时，当在0.5 M HSO电解质溶液中施加10 mA cm的电流密度时，观察到189 mV的过电势读数。上述证据展示了该物质在电化学能量存储和转换方面的巨大应用能力。