Unlocking Ammonium‐Ion Storage Capability of <scp> MoS ₂ </scp> via Synergistic Molecular Engineering Strategies

Layered transition metal dichalcogenides (TMDs) are deemed as promising electrode materials for aqueous ammonium‐ion batteries (AIBs), yet their ammonium‐ion storage capabilities are still limited by their inferior conductivities and insufficient active sites causing by the spontaneous agglomeration of nanosheets. Herein, multiple molecular engineering strategies, including the phase engineering, doping engineering and structural engineering, are simultaneously conducted on MoS 2 to synergistically boost its ammonium‐ion storage capability. By virtue of its enlarged interlayer distance, enhanced structural stability and extra storage active sites, its ammonium‐ion storage potential is significantly promoted. Consequently, the proposed 1T‐O‐MoS 2 @hollow carbon nanosphere anode delivers a favorable capacity of 186.6 mAh g −1 at 0.1 A g −1 and a high‐capacity retention of 69.5% after 1000 cycles at 1 A g −1 in the full cell system, which are far larger than that of pristine 2H MoS 2 . Moreover, it is able to present stable ammonium‐ion storage capability even at −20 °C. This work indicates the great potentials of molecular engineering strategies on improving the ammonium‐ion storage capability of MoS 2 and it is anticipated to provide an effective way to develop high‐performance electrode materials for AIBs.