Binding Molybdenum selenide with dual conductive carbon as Self-Supporting anode for an efficient sodium storage

Highlights: • MoSe2 with dual conductive carbon structure(C-C/MoSe2/CC) was fabricated via a solvothermal-calcination approach. • The C-C/MoSe2/CC frame as a free-standing electrode for Sodium Storage exhibits outstanding cycling stability. • The dual conductive carbon structure promote the electron transferring, keep the electrode stability. Compounding with conductive carbon is usually an effective strategy to improve the conductivity of TMDCs and alleviate volume expansion. However, single carbon matrix modification may lead to shedding of the electrode material. In this work, a self-supporting electrode structure is proposed that has MoSe₂ as the TMDC sandwiched between the carbon cloth(CC) core and the outer carbon layer to form C-C/MoSe₂/CC frame. The dual conductive carbon structure not only can suppress volume expansion, but also can form long-range conductive network. The outer carbon layer can provide short-range electron transfer paths, prevent the active materials from falling off, improve the cycling stability. The unique freestanding structure was synthesized via a multi-step solvothermal and calcination approach. With the above advantages, the C-C/MoSe₂/CC heterostructure delivers remarkable cycling stability. In detail, a capacity of 355 mAh g⁻¹ was obtained after 700 cycles at 1 A g⁻¹ as the anode of SIBs. The Kinetic results show that most of the Na⁺ storage in C-C/MoSe₂/CC is governed by a pseudocapacitive process.