Two-dimensional matrices confining metal single atoms with enhanced electrochemical reaction kinetics for energy storage applications

Tang

et al. 2022

Small

As a common nuclide in radioactive wastewater, uranium (U) is generally treated by landfill, which induces the massive abandonment of uranium resources. In this work, a pulse voltammetry method for the synthesis of U single atoms on MoS 2 (U/MoS 2 ) nanosheets from radioactive wastewater for the electrocatalytic alkaline hydrogen evolution reaction (HER) is reported. The mass loading of U single atoms is facilely controlled with high selectivity for coexisting ions in radioactive wastewater. In the electrolyte of 1 m of KOH, U/MoS 2 nanosheets with 5.2% of U single atoms exhibit relatively low overpotentials of 72 mV at 10 mA cm −2 . The mechanistic study reveals that the HER on U/MoS 2 includes the water dissociation on U single atoms to form OH* and H transfer from OH* to adjacent S-edge atoms. This procedure exhibits decreased activation energy for transition state in water dissociation and optimized Gibbs free energy for H* adsorption.

Section: Catalytic Performance For Hermentioning

confidence: 99%

Synthesis of Uranium Single Atom from Radioactive Wastewater for Enhanced Water Dissociation and Hydrogen Evolution

Tang

et al. 2022

Small

“…Due to the inertness of the intrinsic Gr surface, it is difficult for the pristine surface C atoms to coordinate with metal atoms directly, and the weak binding energy may result in the aggregation of single atoms. 39 Thus, it is necessary to introduce heteroatoms to provide the coordination environment for metal centers to form strong metal–substrate interactions. In general, N-doped Gr substrates are widely used to anchor single atoms, 40 and various SACs with the structure of MN x ( x = 1–4) have been successfully prepared by many synthesis methods, 41–43 including metal–organic framework (MOF) derived materials and conjugated macrocycle derived materials .…”

Section: Gr-based Sacs For Co2 Reductionmentioning

confidence: 99%

Support-based modulation strategies in single-atom catalysts for electrochemical CO₂ reduction: graphene and conjugated macrocyclic complexes

Zhou

et al. 2022

J. Mater. Chem. A

“…Nowadays, single metal atom catalysts have been focused on owing to their unique electronic structure and low coordination environment. − Considering that the single atom loading is kept under 2%, the interaction between isolated single-atom active sites is faint. It is reckoned that high-loading single metal atoms form adjacent single atoms with synergetic interaction by shortening the distance between active sites.…”

Section: Catalytic Cathode Design For Li–co2 Batteriesmentioning

confidence: 99%

Recent Advances in Rechargeable Li–CO₂ Batteries

Sun

Hou

et al. 2021

Energy Fuels

Li−CO 2 batteries have attracted increasing attention recently due to their high discharging voltage (∼2.8 V) and large theoretical specific energy (1876 Wh kg −1 ). The conversion of CO 2 relieves its detrimental impact effect on the environment. Despite the aforementioned superiorities, practical Li−CO 2 batteries are still restricted by some issues, such as intricate multiphase interfacial reactions and intrinsic insulating characteristics of carbonate products. Here, reaction mechanisms based on CO 2 conversion reaction are summarized. Updated research achievements about catalytic cathodes and electrolyte systems are reviewed and discussed. Critical scientific issues and innovative perspectives are presented for Li−CO 2 electrochemistry. This review provides an overall recognition for the latest Li− CO 2 system and indicates the potential evolutions for the next-generation energy storage system.