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Experimental Investigation into the Reactions Between Liquid Gallium and Inorganic Nitrogen Precursors (N<sub>2</sub>, NH<sub>3</sub>, and NH<sub>4</sub>Cl) at 400-500 °C.

Materials (Basel, Switzerland)·2026

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Updated: Jun 11, 2025

Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture

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Published on: September 29, 2023

Closed-Loop and Precipitation-Free CO₂ Capture Process Enabled by Electrochemical pH Gradient.

Jiayin Zhou¹, Xiaofei Guan¹

¹School of Physical Science and Technology, ShanghaiTech University, 393 Huaxia Middle Road, Shanghai, 201210, China.

|October 7, 2024

Summary

This study introduces a novel flow cell for efficient carbon dioxide (CO2) capture from air and flue gas. The precipitate-free, closed-loop system utilizes electrochemical pH gradients for cost-effective carbon capture.

Keywords:

Acidity Basicity Direct air capture Flue gas Water electrolysis

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Published on: October 25, 2017

Area of Science:

Environmental Science and Engineering
Electrochemistry
Climate Change Mitigation Technologies

Background:

Climate change necessitates effective negative-emission technologies for carbon dioxide (CO2) mitigation.
Existing CO2 capture methods often face challenges with cost, efficiency, and environmental impact.
Development of economical, effective, and benign CO2 capture processes is urgently required.

Purpose of the Study:

To design and report a novel flow cell for precipitate-free, closed-loop CO2 capture from air or flue gas.
To demonstrate an electrochemical method for CO2 capture without ion-exchange membranes.
To develop a simplified and potentially more economical CO2 capture process.

Main Methods:

A flow cell utilizing water electrolysis to create an electrochemical pH gradient.
No ion-exchange membrane is employed in the electrolyzer.
CO2 capture occurs in an alkaline solution, followed by release upon mixing with an acidic solution.

Main Results:

The flow cell successfully captures CO2 from dilute sources like air and flue gas.
The process operates cyclically, driven by water electrolysis and mechanical pumping.
The method avoids calcium carbonate precipitation, simplifying separation and minimizing material loss.

Conclusions:

The developed electrochemical pH gradient flow cell offers an efficient and precipitate-free approach to CO2 capture.
This technology shows promise for both small-scale and large-scale CO2 capture applications.
The system's simplicity and potential cost-effectiveness make it a viable option for climate change mitigation.