Freestanding 3D Ordered Hierarchical Porous Carbon Aerogel Cathodes for Efficient Electrocatalytic Dechlorination of 1,2-Dichloroethane to Ethylene

Abstract

Electrochemical dechlorination of 1,2-dichloroethane (DCE) to produce high-value ethylene is an efficient and economic strategy to reduce carbon emission. However, it is challenging to completely realize high-efficiency ethylene production due to the lack of high-performance catalysis. Herein, a directional freeze-casting and metal–organic framework-derived synergistic strategy was reported to construct a 3D ordered hierarchical porous carbon aerogel (OHPCA) with excellent mechanical properties. The as-prepared aerogel was used as a freestanding flexible electrode for electrocatalytic dechlorination of DCE. OHPCA possessed a higher Faradaic efficiency and ethylene selectivity than others due to the synergistic effects between directional ordered channels and hierarchical pore structures. Combining the stability experiments and characterizations, we found that the ordered hierarchical porous architecture possessed superior stability. This work offers a new approach to construct 3D OHPCA electrodes and provides a reference to design and synthesize highly effective carbon-based electrocatalysts.

P-Doped NiMn2O4 Hollow Tubular Nanofiber Spinel Composites for Electrocatalytic Dechlorination

“…Electrochemical impedance spectroscopy (EIS) was used to better understand the charge and ion transfer kinetics, as shown in Figure e. P 1.0 -NM-HTNFs exhibited the smallest semicircle in the high-frequency range with lower charge-transfer resistance ( R ct ) than other electrocatalysts, indicating that P 1.0 -NM-HTNFs have higher electrical conductivity and electron-transfer efficiency, which enhanced the catalytic kinetics of the DCM reaction. ,, Table S2 shows equivalent circuit models corresponding to the Nyquist plots of NM-HTNFs and P x -NM-HTNFs ( x = 0.5, 1.0, 1.5) electrocatalysts. R ct exhibited significant disparity with the Warburg resistance ( W ), indicating that the electrocatalyst activity is mainly decided by the charge-transfer capacity rather than the reactant diffusion efficiency. , The electrochemical surface area (ECSA) was quantified across a range of scan rates from 60 to 200 mV s –1 in Figure S6.…”

Optimization of Dechlorination Experiment Design Using Lightweight Deep Learning Model

“…The calcined products of bimetallic hydroxides can reabsorb water and anions under certain conditions by using the structural memory effect to partially restore the layered structure of lactate dehydrogenase [ 29 ]. Layered double-layer hydroxide has a stable effect and high chloride ion removal efficiency, but chloride ions will be affected by the presence of other anions [ 30 , 31 ]. Principle of copper powder dechlorination: copper and copper ions interact with chloride ions in solution to form cuprous chloride precipitation.…”

Rational Design and Structural Regulation of Robust Catalysts for Electrocatalytic Hydrodechlorination: From Nanostructures to Single Atoms

“…(d) Production rate and selectivity of OHPCA. Adapted with permission from ref . Copyright 2022, American Chemical Society.…”

“…The test performances of these carbon materials are in good agreement with the theoretical calculation results, and carbon materials with rich intrinsic pentagonal defects have the highest catalytic activity. Guo et al 65 synthesized a novel three-dimensional ordered porous carbon aerogel (OHPCA) by the synergistic strategy of freeze casting and MOF-derived (Figure 4c-d). Benefiting from the synergistic effect between oriented ordered pores and MOFderived layered pore structure, the fabricated OHPCA showed a good performance in the electrochemical dechlorination of 1,2-DCA.…”