• We developed an efficient and extensible strategy to produce the single-phase ternary NbSSe nanohybrids with defect-enrich microstructure.

• The anionic-Se doping play a key role in effectively modulating the electronic structure and surface chemistry of NbS₂ phase, including the increased interlayers distance (0.65 nm), the enhanced intrinsic electrical conductivity (3.23 × 10³ S m^-1) and extra electroactive defect sites.

• The NbSSe/NC composite as anode exhibits rapid Na+ diffusion kinetics and increased capacitance behavior for Na⁺ storage, resulting in high reversible capacity and excellent cycling stability.

Sodium-based dual-ion batteries (SDIBs) have gained tremendous attention due to their virtues of high operating voltage and low cost, yet it remains a tough challenge for the development of ideal anode material of SDIBs featuring with high kinetics and long durability. Herein, we report the design and fabrication of N-doped carbon film-modified niobium sulfur–selenium (NbSSe/NC) nanosheets architecture, which holds favorable merits for Na⁺ storage of enlarged interlayer space, improved electrical conductivity, as well as enhanced reaction reversibility, endowing it with high capacity, high-rate capability and high cycling stability. The combined electrochemical studies with density functional theory calculation reveal that the enriched defects in such nanosheets architecture can benefit for facilitating charge transfer and Na⁺ adsorption to speed the electrochemical kinetics. The NbSSe/NC composites are studied as the anode of a full SDIBs by pairing the expanded graphite as cathode, which shows an impressively cyclic durability with negligible capacity attenuation over 1000 cycles at 0.5 A g⁻¹, as well as an outstanding energy density of 230.6 Wh kg⁻¹ based on the total mass of anode and cathode.

• 我们开发了一种高效且可扩展的策略来生产具有缺陷丰富微观结构的单相三元 NbSSe 纳米杂化物。

• 阴离子Se掺杂在有效调节NbS ₂相的电子结构和表面化学方面发挥着关键作用，包括增加层间距离（0.65 nm）、增强本征电导率（3.23 × 10 ³ S m ^-1）和额外的电导率。电活性缺陷位点。

• NbSSe/NC复合材料作为阳极表现出快速的Na+扩散动力学和增加的Na ⁺存储电容行为，从而产生高可逆容量和优异的循环稳定性。

钠基双离子电池（SDIB）因其工作电压高、成本低等优点而受到广泛关注，但开发具有高动力学和长耐久性的理想SDIB负极材料仍然是一个严峻的挑战。在此，我们报道了氮掺杂碳膜修饰的铌硫硒（NbSSe/NC）纳米片结构的设计和制造，该结构具有扩大层间空间、提高导电性和增强反应的Na ⁺存储的有利优点可逆性，赋予其高容量、高倍率性能和高循环稳定性。电化学研究与密度泛函理论计算相结合表明，这种纳米片结构中的富集缺陷有利于促进电荷转移和Na ⁺吸附，从而加速电化学动力学。通过将膨胀石墨配对作为阴极，研究了 NbSSe/NC 复合材料作为全 SDIB 的阳极，其表现出令人印象深刻的循环耐久性，在 0.5 A g ^-1下超过 1000 次循环的容量衰减可忽略不计，以及出色的能量密度230.6 Wh kg ^-1基于阳极和阴极的总质量。