3D porous graphene with ultrahigh surface area for microscale capacitive deionization

• Capacitive deionization (CDI) is an emerging technology to supply deionized water as liquid coolant for the thermal management in microelectronics.
• KOH-activated graphene has an ultrahigh specific surface area of 3513 m2/g and electrical conductivity of 104 S/m.
• KOH-activated graphene-based CDI can achieve an electrosorption capacity of 11.86 mg/g, which is the highest value among graphene-based electrode reported for CDI applications at the same conditions.

Capacitive deionization (CDI) is an emerging technology to supply deionized water as liquid coolant for the thermal management in microelectronics. Graphene has been demonstrated as a promising candidate for CDI electrode. However, the performance of current graphene-based CDI is far below expectation due to the limited specific surface area (SSA) and electrical conductivity of the chemically reduced graphene. Here we presented a KOH-activated graphene that has ultrahigh SSA of 3513 m2/g and electrical conductivity of 104 S/m. With improved materials properties, an ultrahigh electrosorption capacity of 11.86 mg/g and a significant adsorption rate of 20 min are achieved.

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