Despite their high theoretical capacity, Bi-based anodes are plagued by sluggish charge-transfer kinetics and severe structural degradation originating from poor electrical conductivity and repeated volume variation during alloying/dealloying. Herein, a graphene nanoribbon-interconnected Bi@Bi₂O₂CO₃ heterostructure (B/BOC-GR_0.1) is designed to simultaneously establish a continuous conductive network and reinforce the heterointerface. The Bi₂O₂CO₃ shell effectively accommodates cyclic strain and stabilizes the electrode architecture, while graphene nanoribbons strengthen interfacial electronic coupling and accelerate electron transport, thereby synergistically promoting reaction kinetics and structural robustness.As a result, B/BOC-GR_0.1 delivers 1560 C g^-1 at 1 A g^-1 and retains 795 C g^-1 at 50 A g^-1, greatly surpassing those of Bi anodes (623 C g^-1 at 1 A g^-1, 281 C g^-1 at 50 A g^-1). Moreover, after 5000 cycles at 10 A g^-1, B/BOC-GR_0.1 maintains approximately 90% of its initial capacity. The construsted asymmetric supercapacitor achieves an energy density of 70 Wh kg^-1 at a power density of 752 W kg^-1, highlighting the potential of the designed heterostructure for advanced electrochemical energy-storage applications.

High-performance electrocatalysts for oxygen evolution reaction (OER) are crucial for water splitting and metal-air batteries. Two-dimensional (2D) metal-organic framework (MOF) has become a new class of efficient OER electrocatalysts due to the rich coordination unsaturated metal nodes, large specific surface area, and adjustable structures. In addition, because inheriting the original microstructure of MOFs and having stronger chemical and mechanical stability, metal/alloy/oxide, metal sulfide/selenide/phosphide, and other compounds derived from 2D MOFs have also shown their unique OER catalytic ability. Here, we briefly introduced the existing reaction mechanism and evaluation parameters of catalyst performance of OER, introduced the synthesis methods and corresponding characterization techniques of 2D MOFs and their derivatives, and summarized the latest progress of 2D MOFs and their derivatives as OER catalysts. Finally, we put forward some views and suggestions on the existing problems hindering the development of 2D MOFs as OER for advancing the field.

Facile design of economic-effective hydrogen evolution reaction (HER) catalysts with non-noble materials are promising for the production of renewable chemical fuels. Two-dimensional (2D) ultrathin transition metal dichalcogenides (TMDs) materials with large specific surface area and abundant catalytic active sites can significantly enhance their catalytic activities. Herein, we design and synthesize an atomically thin Ni-Se-S based hybrid nanosheet (NiSe_1.2S_0.8) via a simple solvothermal method, the thickness of NiSe_1.2S_0.8 nanosheets is only about 1.1 nm. Benefiting from the ultrathin nanostructure and rich defects, the optimal NiSe_1.2S_0.8 exhibits good electrocatalytic activity with the overpotential of 144 mV at -10 mA·cm^-2, a small Tafel slope of 59 mV·dec^-1, and outstanding catalytic stability in acid electrolyte for HER. The theoretical results show that hybrid electrocatalyst by S incorporation possesses the optimal adsorption free energy of hydrogen (ΔG_H*). This study provides a simple method to synthesize a high-performance multicomponent electrocatalysts with the ultrathin nanostructures and abundant defects.