Prussian blue analogues (PBAs) are believed to be intriguing anode materials for Li + storage because of their tunable composition, designable topologies, and tailorable porous structures, yet they suffer from severe capacity decay and inferior cycling stability due to the volume variation upon lithiation and high electrical resistance. Herein, we develop a universal strategy for synthesizing small PBA nanoparticles hosted on two-dimensional (2D) MXene or rGO (PBA/MX or PBA/rGO) via an in situ transformation from ultrathin layered double hydroxides (LDH) nanosheets. 2D conductive nanosheets allow for fast electron transport and guarantee the full utilization of PBA even at high rates; at the meantime, PBA nanoparticles effectively prevent 2D materials from restacking and facilitate rapid ion diffusion. The optimized Ni 0.8 Mn 0.2 -PBA/MX as an anode for lithium-ion batteries (LIBs) delivers a capacity of 442 mAh g −1 at 0.1 A g −1 and an excellent cycling robustness in comparison with bare PBA bulk crystals. We believe that this study offers an alternative choice for rationally designing PBA-based electrode materials for energy storage.

Metal–organic frameworks (MOFs) possess the advantages of tailorable porosity, adjustable composition, and tunable topologies and are considered promising precursors and self‐templates for the synthesis of complex nanostructures as advanced electrode materials for energy storage. Among various strategies, wet‐chemical method endows better control over topological evolution and compositional transformation of MOF crystals. Herein, the authors comprehensively review the recent achievements on wet‐chemical derivation of MOF via etching, ion‐exchange, hydrolysis, and chemical transformation, underscore the corresponding mechanisms, and highlight their important applications in supercapacitors and secondary batteries.

Rechargeable batteries are deemed as green and efficient energy storage systems and have drawn great attention during past decades. Despite the commercial applications of lithium‐ion batteries, the ever‐increasing demands for higher energy storage capability driven by the rapid development of portable/wearable electronics remain unsatisfied due to the low theoretical capacity of the commonly used graphite anode. Herein, a material design strategy by synergizing the merits of conversion‐type Co2V2O7 and intercalation‐based Ti3C2Tx MXene for efficient lithium‐ion storage is reported. The Co2V2O7@MXene hollow polyhedrons are synthesized by ion exchange, surface modification, and the subsequent electrostatic assembly. Benefiting from the high conductivity and mechanical robustness of the MXene sheath, the high theoretical capacity of Co2V2O7, and the unique hollow structure, the optimized hybrids deliver a high output capacity of 949.7 mAh g−1 at 0.1 A g−1, excellent rate capacity with 431.4 mAh g−1 retained at 5.0 A g−1, as well as outstanding cycling stability.