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Electrochemical CO2 Mineralization and H2 Generation from Steel and Coal Waste
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DOI：10.1021/acsenergylett.6c01395.png)
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Abstract
En 中文
We introduce a process that electrochemically couples CO2 capture and mineralization (CCM) with water electrolysis (WE). Leveraging the exothermicity of CO2 mineralization to sustain a reverse pH gradient, this approach lowers the potential required for WE by up to 0.39 V. Demonstration in a three-chamber reactor yields a steady-state pH gradient of 4.4, enabling WE at an onset of 1.30 V and Faradaic efficiency for CO2 fixation of 93%, corresponding to a net energy cost of < 0.5 kWh (kg CO2)–1. Abundant waste streams, including steel slag and coal ash, serve as CO2 sorbents, resulting in waste valorization to synthetic calcite. Accounting for the value of calcite, estimated H2 production costs are < 1 USD kg–1. Because CO2 fixation exceeds grid emissions for the equivalent electrical energy consumption, this process produces carbon-negative H2 using immediately available electricity. At scale, this process has the potential to mitigate > 500 Mt CO2 emissions annually.
Keywords:
Calcite
Carbon capture and storage
Electrical energy
Inorganic carbon compounds
Oxides
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18.2
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5.2K
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