Recent advances in energy-efficient chlorine production <i>via</i> HCl electrolysis

Kafle, Alankar; Gupta, Divyani; Mehta, Shivangi; Garg, Kalpana; Nagaiah, Tharamani C.

doi:10.1039/d3ta07187a

J. Mater. Chem. A

2024

DOI: 10.1039/d3ta07187a

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Recent advances in energy-efficient chlorine production via HCl electrolysis

Alankar Kafle,

Divyani Gupta,

Shivangi Mehta

et al.

Abstract: Chlorine (Cl2) is one of the most important prime feeding reactants in the chemical industries but around half of the chlorine employed in the industry gets converted to secondary products...

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Cited by 4 publications

References 107 publications

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Toward sustainable soda ash production: A critical review on eco-impacts, modifications, and innovative approaches

Rahimpour,

Fahmi,

Zinatloo-Ajabshir

2024

Results in Engineering

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Toward sustainable soda ash production: A critical review on eco-impacts, modifications, and innovative approaches

Rahimpour,

Fahmi,

Zinatloo-Ajabshir

2024

Results in Engineering

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Understanding the Effect of M(III) Choice in Heterodinuclear Polymerization Catalysts

Eisenhardt,

Fiorentini,

Williams

2024

Inorg. Chem.

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The ring-opening copolymerization (ROCOP) of epoxides with CO 2 or anhydrides is a promising strategy to produce sustainable polycarbonates and polyesters. Currently, most catalysts are reliant on scarce and expensive cobalt as the active center, while more abundant aluminum and iron catalysts often suffer from lower activities. Here, two novel heterodinuclear catalysts, featuring abundant Al(III), Fe(III), and K(I) active centers, are synthesized, and their performance in the polymerization of four different monomer combinations is compared to that of their Co(III) analogue. The novel Al(III)K(I) catalyst exhibits outstanding activities in the cyclohexane oxide (CHO)/CO 2 ROCOP, and at 1 bar CO 2 pressure it is the fastest aluminum-based catalyst reported to date. The M(III) site electronics for all three catalysts, Al(III)K(I), Fe(III)K(I), and Co(III)K(I), are measured using IR and NMR spectroscopy, cyclic voltammetry, and single crystal Xray diffraction. A correlation between M(III) electron density and catalytic activity is revealed and, based on the established structure−activity relationship, recommendations for the future catalyst design of abundant Al(III)-and Fe(III)-based catalysts are made. The catalytic performances of both Al(III)K(I) and Fe(III)K(I) are further contextualized against the relative elemental abundance and cost. On the balance of performance, abundance, and cost, the Al(III)K(I) complex is the better catalyst for the carbon dioxide/epoxide ROCOP, while Fe(III)K(I) is preferable for anhydride/epoxide ROCOP.

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Harnessing Iron Nitride Matrices through Incorporated Cu-Based Moieties for Chlorine Evolution Reaction

Badreldin,

Youssef,

El-Ghenymy

et al. 2024

ACS Appl. Energy Mater.

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Chlorine evolution reaction (CER) is a critical reaction in many processes, such as chlor-alkali electrolysis and electrochemical wastewater treatment. The scarce and high-cost iridium and ruthenium content of benchmark dimensionally stable anodes (DSA) coupled with subpar activities at commercially relevant current densities (≥150 mA cm −2 ) opens the door for additional material groups to be investigated. Herein, a highly porous, conductive, and chemically resilient trigonal ε-Fe 3 N-based electroactive catalytic substrate is used toward CER in industrial acidic brine (4.0 M NaCl, pH = 2) environments. Consecutive hydrothermal-nitridation steps were fine-tuned for homogeneous dispersion of Cu 3 N moieties atop FeN, which exhibited a similar overpotential to DSA at a commercially relevant current density. An approximately 562 mV overpotential was needed to sustain a current density of 200 mA cm −2 for 75 h of chronoamperometric conditions. Moreover, online GC measurements with a chlorine trap were employed to indirectly obtain CER's Faradaic efficiency (FE) by measuring the FE of the competing oxygen evolution reaction. Textural, chemical, and electrochemical characterization techniques were employed to confirm the identity of the developed anodes and depict the electrocatalytic performance. The findings reported herein could offer potential avenues for similar catalytic systems in both conventional CER and emerging electrosynthesis approaches utilizing saline waters.

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Recent advances in energy-efficient chlorine production via HCl electrolysis

Abstract: Chlorine (Cl2) is one of the most important prime feeding reactants in the chemical industries but around half of the chlorine employed in the industry gets converted to secondary products...

Cited by 4 publications

References 107 publications

Toward sustainable soda ash production: A critical review on eco-impacts, modifications, and innovative approaches

Toward sustainable soda ash production: A critical review on eco-impacts, modifications, and innovative approaches

Understanding the Effect of M(III) Choice in Heterodinuclear Polymerization Catalysts

Harnessing Iron Nitride Matrices through Incorporated Cu-Based Moieties for Chlorine Evolution Reaction

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