Fuel cells are considered renewable and clean energy sources to replace the dwindling fossil fuel resources. However, the sluggish reaction kinetics of the anodic fuel oxidation and cathodic oxygen reduction reactions hinder the wide commercialization of fuel cells. The Pt/C material is still the most efficient electrocatalyst; however, its high price and poor stability severely impede its large-scale application. Recently, transition metal nitrides (TMNs) have been regarded as promising electrocatalyst materials owing to their unique physical, chemical, and electronic properties, e.g., thermal stability, metallic conductivity, great hardness, and corrosion resistance. Herein, the advances pertaining to TMN-based catalyst materials for fuel cells are reviewed, ranging from their structures, properties, and synthesis to their applications. TMNs can act as catalysts or supports in electrocatalytic processes. Briefly, as catalysts, TMNs are grouped into free-standing TMNs (including binary and ternary TMNs) and TMN/carbon composites. Moreover, as supports, TMNs can be categorized as pure TMNs supports and hybrid supports to anchor noble metals. Finally, the challenges and perspectives of TMN-based catalyst materials for high-performance fuel cell systems are discussed.

Trace amounts of H₂O are inevitably introduced during lithium battery manufacturing processes, which induces the hydrolysis of LiPF₆, leading to HF formation, which triggers a cascade of deleterious reactions that degrade the solid electrolyte interphase (SEI) and corrode electrode materials. In this work, a water-scavenging electrolyte was constructed by employing a boroxine-linked covalent organic framework (COF) as the suspended phase. The ring-opening reaction of the boroxine ring units in COFs can effectively capture H₂O, thereby suppressing the hydrolysis of PF₆⁻ and mitigating electrode corrosion caused by HF. Consequently, a Li-metal battery with a high-nickel cathode retained 73% of its initial capacity after 500 cycles at 1 C, and a silicon-based lithium-ion battery with a high-nickel cathode sustained stable cycling over 500 cycles at a high rate of 10 C. This suspension strategy, leveraging a boroxine-linked COF with dual H₂O-scavenging capability, offers a scalable and versatile platform for electrolyte engineering toward practical next-generation lithium batteries.