Transition metal chalcogenides have been one of the research hotspots in sodium-ion batteries (SIBs). In this work, Cu₂Se-ZnSe heterojunction nanoparticles were embedded in carbon nanofibers to obtain the composites (Cu₂Se-ZnSe-CNFs). As anodes for SIBs, Cu₂Se-ZnSe-CNFs showed a reversible capacity of 310 mAh g⁻¹ after 100 cycles at 0.1 A g⁻¹. Their rate capacity is 237 mAh g⁻¹ at 2 A g⁻¹. The high specific capacities of Cu₂Se-ZnSe-CNFs at a wide range of current density can be attributed to the type-I heterojunction between Cu₂Se and ZnSe in composites, which can speed up electron transport. In addition, the protection from CNFs is another factor to ensure the long lifetime of Cu₂Se-ZnSe-CNF anodes. The strategy of using heterojunction to promote the electrochemical properties of multi-metal sulfides may be helpful for the application of carbon composites in electrochemical catalysts and other batteries.

过渡金属硫属化物已成为钠离子电池（SIB）的研究热点之一。在这项工作中，将Cu ₂ Se-ZnSe异质结纳米粒子嵌入碳纳米纤维中以获得复合材料（Cu ₂ Se-ZnSe-CNFs）。作为SIB的阳极，Cu ₂ Se-ZnSe-CNF在0.1A g ^-1下循环100次后显示出310 mAh g ^-1的可逆容量。其速率容量是237毫安克^-1以2A克^-1。Cu ₂ Se-ZnSe-CNF在大电流密度范围内的高比容量可归因于Cu ₂之间的I型异质结复合物中的Se和ZnSe可以加速电子传输。另外，防止CNFs是确保Cu ₂ Se-ZnSe-CNF阳极长寿命的另一个因素。使用异质结提高多金属硫化物的电化学性能的策略可能有助于碳复合材料在电化学催化剂和其他电池中的应用。