Heterostructure of NiSe₂/MnSe nanoparticles distributed evenly over cross-linked N-doped carbon nanosheets (NM@NCNs) was developed as anode material via a hydrothermal strategy followed by an in situ selenization process. The anode delivered a high reversible capacity of 487 mAh g⁻¹ at 5 A g⁻¹ after 200 cycles and an excellent rate capacity of 269 mAh g⁻¹ at a high current density of 10 A g⁻¹. In particular, under −10 °C, the electrode still maintained a satisfactory rate capability for 271 mAh g⁻¹ at 5 A g⁻¹. The advanced electrochemical performance is related with the following merits. First, NiSe₂/MnSe nanoparticles as bimetallic selenide can offer a higher specific capacity than monometallic selenide. Moreover, the rich redox-active sites provided by NiSe₂/MnSe can accelerate the electrochemical reaction. Second, cross-linked NCNs with high electronic conductivity can serve as a substrate, preventing nanoparticle agglomeration and alleviating the variations in volume. Third, NiSe₂/MnSe heterostructure proved by X-ray photoelectron spectroscopy (XPS) results can form lattice distortion, enhancing Na⁺ diffusion in the redox process. The possible electrochemical process was demonstrated by ex situ X-ray diffraction, and the Na⁺ diffusion rate of the NM@NCNs anode was calculated using the galvanostatic intermittent titration technique.

通过水热策略和原位硒化工艺，将均匀分布在交联 N 掺杂碳纳米片 (NM@NCNs)上的 NiSe _{2 /MnSe 纳米粒子的异质结构开发为负极材料。}在 200 次循环后，负极在 5 A g ^-1下提供 487 mAh g ^{-1的高可逆容量，在 10 A g -1}的高电流密度下提供 269 mAh g ^-1的优异倍率容量。特别是在-10 ℃下，电极在5 A g ^{-1下仍保持了令人满意的271 mAh g -1}倍率性能。先进的电化学性能与以下优点有关。一、NiSe ₂/MnSe纳米粒子作为双金属硒化物可以提供比单金属硒化物更高的比容量。此外，NiSe ₂ /MnSe 提供的丰富的氧化还原活性位点可以加速电化学反应。其次，具有高电子电导率的交联 NCNs 可以作为基材，防止纳米颗粒团聚并减轻体积变化。第三， X射线光电子能谱（XPS）结果证明NiSe _{2 /MnSe异质结构可以形成晶格畸变，增强氧化还原过程中的Na} ⁺扩散。通过非原位X 射线衍射证明了可能的电化学过程，Na ⁺使用恒电流间歇滴定技术计算 NM@NCNs 阳极的扩散速率。