Fact Snapshot
- Paper: High-stable α-phase NiCo double hydroxide microspheres via microwave synthesis for supercapacitor electrode materials
- Equipment: XH-MC-1
- Source: Chemical Engineering Journal, 2017
- Research direction: microwave synthesis of energy-storage materials, layered double hydroxides, supercapacitor electrodes, and Ni-Co synergistic energy storage
- Core conditions: Temperature 100 °C, Microwave power 300 W, and Time 120 min / 8 min / 30 min
- Key results: Asymmetric-device energy/power density 42.5 Wh kg^-1, Asymmetric-device energy/power density 400 W kg^-1, Retention 80.7%, and Device specific capacitance 119.5 F g^-1
Research Abstract
High-stable α-phase NiCo double hydroxide microspheres via microwave synthesis for supercapacitor electrode materials was published in Chemical Engineering Journal (2017) and is indexed as a Xianghu Q1 application case for XH-MC-1. The source record connects it with microwave synthesis of energy-storage materials, layered double hydroxides, supercapacitor electrodes, and Ni-Co synergistic energy storage. Core operating conditions include Temperature 100 °C, Microwave power 300 W, and Time 120 min / 8 min / 30 min. Key reported results include Asymmetric-device energy/power density 42.5 Wh kg^-1, Asymmetric-device energy/power density 400 W kg^-1, Retention 80.7%, and Device specific capacitance 119.5 F g^-1.
Research Background and Problem
Equipment Use and Experimental Conditions
| Item | Parameter |
|---|---|
| Temperature | 100 °C |
| Microwave power | 300 W |
| Time | 120 min / 8 min / 30 min |
Key Result
| Metric | Result |
|---|---|
| Asymmetric-device energy/power density | 42.5 Wh kg^-1 |
| Asymmetric-device energy/power density | 400 W kg^-1 |
| Device specific capacitance | 119.5 F g^-1 |
| Capacitance | 122.5% |
| Capacitance | 1220 F g^-1 |
| Retention | 80.7% |
Evidence Details
The resulting solution was placed in the microwave oven (XH-MC-1, Xianghu Co., Beijing) and heated under the microwave irradiation for various time (8–120 min) at 100 °C with the microwave power of 300 W ...
The capacitance increased to 1220 F g−1 after 2000 cycles at 10 A g−1 (122.5% of its initial value) and still remained 93.8% after another 1000 cycles at 30 A g−1.
Time: 120 min / 8 min / 30 min
NiCo DH possessed a high specific capacitance of 1120 F g−1 at 1 A g−1 ... and remained 996 F g−1 at 10 A g−1 (88.9% retention).
NiCo DH ... delivered a high energy density of 42.5 Wh kg−1 at a power density of 400 W kg−1.
Additional source evidence: source values include 88.9%, 79.6%.
Retention: 80.7%
Mechanism / Method Highlights
- Dipolar polarization and ionic conduction under microwave heating accelerate precursor nucleation and layered-unit assembly.
- Ni-Co synergy introduces Co3+ and helps balance interlayer charge, stabilizing the alpha-phase structure.
- The flower-like microspheres consist of ultrathin nanosheets, providing more accessible active sites and shorter ion-diffusion paths.
- Interlayer exchange between CNO- and OH- gradually exposes more redox sites during cycling, producing capacitance activation.
- The coherent 3D superstructure and interlayer ion-buffering effect jointly support high stability.
Application Value
- The asymmetric device reaches 42.5 Wh kg^-1 at 400 W kg^-1.
- Preserves quantitative result evidence: Asymmetric-device energy/power density 42.5 Wh kg^-1, Asymmetric-device energy/power density 400 W kg^-1, Retention 80.7%, and Device specific capacitance 119.5 F g^-1.
- Maintains source-level evidence details: Equipment evidence: The resulting solution was placed in the microwave oven (XH-MC-1, Xianghu Co., Beijing) and heated under the microwave irradiation for various time (8–120 min) at 100 °C with the microwave power of 300 W, Abstract evidence: The capacitance increased to 1220 F g−1 after 2000 cycles at 10 A g−1 (122.5% of its initial value) and still remained 93.8% after another 1000 cycles at 30 A g−1, Condition evidence: Time: 120 min / 8 min / 30 min, and Source evidence: NiCo DH possessed a high specific capacitance of 1120 F g−1 at 1 A g−1 ... and remained 996 F g−1 at 10 A g−1 (88.9% retention).
Related Equipment
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High-stable α-phase NiCo double hydroxide microspheres via microwave synthesis for supercapacitor electrode materials
Chemical Engineering Journal, 2017
DOI: 10.1016/j.cej.2017.01.057