Reaction Kinetics in Proton Batteries: An EIS/DRT‐Based Case Study of Vanadium Pentoxide Electrodes

Why It Matters

Understanding proton‑battery kinetics accelerates the shift away from lithium‑dependent storage, supporting greener, safer energy solutions. The refined EIS‑DRT framework equips developers with actionable data to optimize electrode design and performance.

Key Takeaways

• Proton batteries address lithium scarcity and safety concerns
• V2O5 electrode studied in aqueous proton electrolyte
• EIS coupled with DRT isolates charge transfer, diffusion, interface effects
• Methodology applicable to other proton-hosting electrode materials
• Enhanced impedance analysis improves battery design accuracy

Pulse Analysis

Proton‑based energy storage is gaining traction as a sustainable alternative to lithium‑ion systems, which face raw‑material constraints and safety challenges. Vanadium pentoxide, known for its layered structure and high theoretical capacity, serves as an ideal testbed for probing proton insertion mechanisms. By immersing V2O5 in a neutral aqueous electrolyte, researchers replicate real‑world operating conditions while avoiding the complexities of organic solvents, thereby delivering insights that are directly translatable to commercial cell designs.

Electrochemical impedance spectroscopy has long been a staple for characterizing battery interfaces, yet its resolution falters when multiple processes share similar time constants. The integration of distribution of relaxation time analysis resolves this limitation by deconvoluting overlapping signals into distinct frequency domains. This dual‑technique approach quantifies charge‑transfer resistance, solid‑state diffusion coefficients, and interfacial capacitance with unprecedented clarity, enabling engineers to pinpoint performance bottlenecks and tailor material modifications accordingly.

The broader implication of this work lies in its methodological portability. Because the EIS‑DRT workflow relies on generic electrical measurements and computational fitting, it can be extended to a wide array of proton‑conducting electrodes, from metal oxides to organic frameworks. As the industry pushes toward scalable, low‑cost proton batteries for grid storage and electric mobility, such granular kinetic data will be essential for accelerating material discovery, reducing development cycles, and ultimately delivering safer, more efficient energy solutions.