Single atom catalysts for triiodide adsorption and fast conversion to boost the performance of aqueous zinc–iodine batteries

Abstract

Zinc-iodine (Zn-I2) batteries are a practically promising energy storage because of low-cost, environmental ‘friendliness’ and attractive energy density. However, triiodide dissolution and poor conversion kinetics hinder application. Here we demonstrate...

Janus Binder Chemistry for Synchronous Enhancement of Iodine Species Adsorption and Redox Kinetics toward Sustainable Aqueous Zn–I2 Batteries

“…It means that a smaller Tafel slope (η) corresponds to an improved reaction kinetics. 37 Based on the data presented in Figure 2c, it is evident that the η of the CTS-loaded sample is 40.16 mV dec −1 , which is much lower than that of PVDF with η = 101.64 mV dec −1 . Thermodynamic factors should be taken into account to obtain a more comprehensive and realistic reflection of the QIRR process.…”

“…An ideal QIRR catalyst will present a higher current density at a smaller overpotential. It means that a smaller Tafel slope (η) corresponds to an improved reaction kinetics . Based on the data presented in Figure c, it is evident that the η of the CTS-loaded sample is 40.16 mV dec –1 , which is much lower than that of PVDF with η = 101.64 mV dec –1 .…”

Cyanide Bridged Framework Nanoplates Catalytic Interlayer for High Performance Zinc‐Iodine Battery

“…[22] Catalytic conversion of iodine species in zinc-iodine battery is recently been proposed as an alternative strategy. [23][24][25][26][27] The polyiodides can be fast converted into insoluble iodine species during electrochemical process. Therefore, the fast kinetics not only enhances the cycle stability, but also increases the utilization ratio of iodine species.…”

Suppressing the Shuttle Effect of Aqueous Zinc–Iodine Batteries: Progress and Prospects

“…In order to accelerate the redox kinetics of iodine conversion, the addition of catalytically active metal single-atom catalysts (SACs) such as Ni, Fe, Cu, Co, etc., is the focus of the current research on zinc-iodine batteries. All active metal species in these single-atom catalysts (SACs) exist as isolated single atoms stabilized by the carrier material, which allows for maximum atom utilization compared to bulk metal and nanoparticle catalysts [68,108,109]. Starting from the design of iodine host materials, Ma et al [69] prepared a hierarchical porous carbon skeleton embedded with Ni single atoms through a template method.…”

“…Although all of the above metal single-atom catalysts exhibit excellent catalytic performance, it is a challenging task to select a suitable SAC to suppress the shuttle effect in zinc-iodine batteries because different metals have different electronic properties that affect the kinetics and thermodynamics of the reaction. In order to find suitable SACs, Yang et al [68] proposed an I-intoxication mechanism based on DFT theory calculations. They first calculated and compared the catalytic activity and adsorption capacity for I 3 − of eight single-atom catalysts (Cu, Co, Ni, Fe, Mn, V, Zn, and Ti).…”