Reducing CO2 to dense nanoporous graphene by Mg/Zn for high power electrochemical capacitors

Xing, Zhenyu; Wang, Bao; Gao, Wen‐Yang; Pan, Changqing; Halsted, Joshua; Chong, Elliot S.; Lü, Jun; Wang, Xingfeng; Luo, Wei; Chang, Chih-Hung; Wen, Youhai; Ma, Shengqian; Amine, Khalil; Ji, Xiulei

doi:10.1016/j.nanoen.2014.11.011

Cited by 101 publications

(66 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By introducing CO 2 as a carbon source, Xing et al used Mg powder as a reduction agent to convert CO 2 into carbon, and Zn as the metal reductant to induce microporous structure. The resultant nanoporous graphene exhibited a high SSA of 1900 m 2 g −1 and a specific capacitance of 190 F g −1 at 10 A g −1 127…”

Section: Template Methodsmentioning

confidence: 99%

Synthesis Strategies of Porous Carbon for Supercapacitor Applications

et al. 2020

View full text Add to dashboard Cite

Supercapacitors (SCs) have experienced a significant increase in research activity and commercialization during the past few decades. As the primary and most important electrode active material for commercial SCs, porous carbon is produced at an industrial‐scale through traditional carbonization‐activation strategies. Nevertheless, commercial porous carbon materials have some disadvantages such as high production cost, corrosion of equipment, and emission of toxic gases and byproduct pollutants during production. In recent years, huge efforts have been made to develop novel synthesis strategies for porous carbon materials. This review focuses on the pore formation mechanisms in traditional carbonization‐activation methods, emerging activation methods, template methods, self‐template methods, and novel emerging methods for the synthesis of porous carbons for SCs. Strategies developed so far for the synthesis of porous carbon materials are summarized. The mechanisms and recent advances for each strategy are reviewed. Furthermore, future directions and synthesis strategies for porous carbons are proposed.

show abstract

Section: Template Methodsmentioning

confidence: 99%

Synthesis Strategies of Porous Carbon for Supercapacitor Applications

et al. 2020

View full text Add to dashboard Cite

show abstract

“…2D carbon nanosheets (CNSs) have been considered to be one of the most promising anode materials for sodium‐based energy storage systems. And chemical vapor deposition (CVD) method has been dominantly used to prepare CNSs by employing various hard templates such as MgAl‐layered double oxide, CaO, Mg/Zn and diatomite …”

Section: Introductionmentioning

confidence: 99%

Carbon Nanosheet Anode for Sodium‐Ion Storage and Its Application in Sodium‐Ion Hybrid Capacitors

et al. 2020

View full text Add to dashboard Cite

In this study, sodium ion hybrid capacitors (SIHCs) constructed by using battery-type carbon nanosheet (CNS) as anode and capacitive activated carbon (AC) as cathode are reported. The CNSs with large interlayer spacing were deposited on Na 2 CO 3 powder by using chemical vapor deposition method. The CNS anode for sodium ion storage exhibits outstanding rate capability (138 mAh g À 1 at 10 A g À 1 , 63 % retention of the capacity at 0.05 A g À 1 ) and excellent long-term cyclability at 10 A g À 1 after 12500 cycles. Benifting from high performance of anodes abovemensioned, the assembled SIHC based on CNS and AC, operated in a voltage window of 1.0 ∼ 4.0 V, delivers a high specific energy of 135 Wh kg À 1 at 250 W kg À 1 and a maximum power of 25 kW kg À 1 with the output 69 Wh kg À 1 . Figure 5. Electrochemical performance of SIHCs with different mass ratios between CNS and AC. (a) CV curves, (b) GCD profiles with the mass ratio of 1 : 1, (c) the energy/power densities of SIHCs with mass ratios of 1 : 2, 1 : 1 and 2 : 1, (d) Ragone plots of SIHCs, and (e) cycling stability. Inset of (e) shows the digital picture of a green "SIHC" LED logo powered by obtained hybrid capacitor.

show abstract

“…Along this line, activated carbon (AC) is one of the most promising materials that can be synthesized from biomass. With desirable properties, such as high surface area, chemical inertness, and good electrical conductivity, AC is a critical component for a plethora of applications, including energy storage [6][7][8], catalysis [9,10], water/air purification [11][12][13], and gas storage [14,15].…”

Section: Introductionmentioning

confidence: 99%

Self-activation of cellulose: A new preparation methodology for activated carbon electrodes in electrochemical capacitors

et al. 2015

Self Cite

View full text Add to dashboard Cite

Self-activation of cellulose: A new preparation methodology for activated carbon Electrodes in electrochemical capacitors, Nano Energy, http://dx. AbstractCurrent synthetic methods of biomass-derived activated carbon call for a high temperature pyrolysis followed by either a chemical or physical activation process. Herein, we report a simple one-step annealing synthesis yielding a high surface area cellulose-derived activated carbon. We discover that simply varying the flow rate of Argon during pyrolysis enables 'self-activation' reactions that can tune the specific surface areas of the resulting carbon, ranging from 98 m 2 /g to values as high as 2600 m 2 /g. Furthermore, we, for the first time, observe a direct evolution of H 2 from the pyrolysis, which gives strong evidence towards an in situ self-activation mechanism. Surprisingly, the obtained activated carbon is a crumbled graphene nanostructure composed of interconnected sheets, making it ideal for use in an electrochemical capacitor. The cellulose-derived nanoporous carbon exhibits a capacitance of 132 F g -1 at 1 A g -1 , a performance comparable to the state-of-the art activated carbons. This work presents a fundamentally new way to look at the synthesis of activated carbon, and highlights the importance of a controlled inert gas flow rate during synthesis in general, as its contributions can have a very large impact on the final material properties.

show abstract

Reducing CO2 to dense nanoporous graphene by Mg/Zn for high power electrochemical capacitors

Cited by 101 publications

References 60 publications

Synthesis Strategies of Porous Carbon for Supercapacitor Applications

Synthesis Strategies of Porous Carbon for Supercapacitor Applications

Carbon Nanosheet Anode for Sodium‐Ion Storage and Its Application in Sodium‐Ion Hybrid Capacitors

Self-activation of cellulose: A new preparation methodology for activated carbon electrodes in electrochemical capacitors

Contact Info

Product

Resources

About