Making use of the inherent nitrogen content of spent coffee grounds to create nanostructured activated carbon for supercapacitor and lithium-ion battery applications

Sangprasert, Thanyathorn; Sattayarut, Vichuda; Rajrujithong, Chonticha; Khanchaitit, Paisan; Khemthong, Pongtanawat; Chanthad, Chalathorn; Grisdanurak, Nurak

doi:10.1016/j.diamond.2022.109164

Cited by 10 publications

(6 citation statements)

References 39 publications

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“…However, N was found to be more effectively fixed into a carbon skeleton by NaOH (Sattayarut et al, 2019), a eutectic mixture of NaOH/KOH (Zhang et al, 2020), Fe 2 O 3 , or ZnCl 2 (Sun, 2017;Han et al, 2018;Hu et al, 2022) activators. Considering the N-functionalities, the N-5 percentage significantly increased with the increasing KOH ratio (Sangprasert et al, 2022). After activation with NaOH, the proportion of N-5, N-6, and N-Q increased, while that of N-X decreased (Sattayarut et al, 2019).…”

Section: Evolution Of N-functionalities During N Self-doped Biochar P...mentioning

confidence: 95%

“…Frontiers in Energy Research frontiersin.org in Figure 2 (Si et al, 2013;Rong et al, 2019;Wen et al, 2019;Hu et al, 2022). A hydrothermal process also has the ability to insert or stabilize foreign atoms into the carbon matrix (Yu et al, 2021;Sangprasert et al, 2022) and etch pores to a certain extent due to the hydrolyzation of hemicellulose and cellulose (Lei et al, 2021;Hu et al, 2022). Thus, modification of functional groups and the porous structure can be achieved by changing the solvent medium (Rawat et al, 2022).…”

Section: Figurementioning

confidence: 99%

“…N self-doped biochar was synthesized from spent coffee grounds via hydrothermal carbonization, followed by KOH activation (Sangprasert et al, 2022). The optimal biochar showed a high SSA of 1835 m 2 /g and 2.35 wt% N content, and, subsequently, a high energy density of 10.84 Wh/kg in a two-electrode system.…”

Section: Organic Waste-based N Self-doped Biocharmentioning

confidence: 99%

“…All kinds of biomass can be employed as the feedstock for biochar production, including agricultural waste (Lang et al, 2021;, tea waste (Wesley et al, 2022), woody biomass (Ma et al, 2021;, seeds (Liang et al, 2021), animal waste (Qin et al, 2022;, fungal waste , vegetables Xue et al, 2022), and starch Among the various types of biomass, it is worth noting that some naturally have a higher N content, for example, algae , mushrooms (Xue et al, 2022), spent coffee ground (Sangprasert et al, 2022), bean pulp (Ding et al, 2021), pharmaceutical drug residues (Zhang et al, 2021;, amino acids (Guo et al, 2021), etc. The bio-oil and syngas production from these N-rich biomasses usually contain high levels of N-containing components, leading to the molecular oligomerization, viscosity, and emission of NOx during subsequent combustion .…”

Section: Introductionmentioning

confidence: 99%

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A state-of-the-art review of N self-doped biochar development in supercapacitor applications

Liu

Yang

2023

Front. Energy Res.

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Due to its renewability, eco-friendliness, and cost-effectiveness, biochar is a promising alternative to fossil fuel-based carbon for electrode material application in supercapacitors. However, pristine biochar often exhibits poor structure and low activity, which strongly inhibit its commercial utilization. N-doping is an efficient way to improve the electrochemical performance of biochar by enhancing the conductivity and surface wettability that further induce a pseudo-capacitance effect. Compared with external doping, the synthesis of N self-doped biochar from natural N-rich biomass without using external N precursors, which are harmful and costly, has attracted increasing attention. Few reviews of N-doped biochar applications in supercapacitors are available, and studies of N self-doped biochar are still scarce. This paper reviews the developments over the past 10 years on the preparation, activation, and application of N self-doped biochar in supercapacitors. Notably, the evolution of N-functionalities during N self-doped biochar production with or without activating agents was analyzed. The relationships between N content and the specific capacitance and the contribution of N self-doping-induced pseudo-capacitance to the total specific capacitance are also discussed. Finally, the challenges and the prospects of N self-doped biochar applications in supercapacitors are proposed.

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Section: Evolution Of N-functionalities During N Self-doped Biochar P...mentioning

confidence: 95%

Section: Figurementioning

confidence: 99%

Section: Organic Waste-based N Self-doped Biocharmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A state-of-the-art review of N self-doped biochar development in supercapacitor applications

Liu

Yang

2023

Front. Energy Res.

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“…Among them, the preparation of solid fuel could be a potential application of SCGs. Till now, most recent studies relating to SCG valorization have primarily been limited to soil conditioner [13], energy storage [14], adsorbent [15], biodiesel [16], and bio-crude oil [17]. Aside from these applications, SCG could be an excellent source for producing solid fuel.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Carbonization of Spent Coffee Grounds for Producing Solid Fuel

Gallant

Salaudeen

et al. 2022

Sustainability

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Spent coffee grounds (SCG) are industrial biowaste resulting from the coffee-brewing process, and they are often underutilized and end up in landfills, thereby leading to the emission of toxic gases and environmental damage. Hydrothermal carbonization (HTC) is an attractive approach to valorize wet biomass such as SCG to valuable bioproducts (i.e., hydrochar). Thus, in this work, the HTC of SCG was carried out in a 500 L stainless steel vessel at 150, 170, 190, 210, and 230 °C for 30 min, 60 min, 90 min, and 120 min and a feedstock to water weight ratio of 1:5, 1:10, and 1:15, and the use of the resulting hydrochar as a solid fuel was evaluated. The results showed that a high energy recovery (83.93%) and HHV (23.54 MJ/kg) of hydrochar was obtained at moderate conditions (150 °C, 30 min, and feedstock to water weight ratio of 1:5) when compared with conventional approaches such as torrefaction. Following this, the surface morphology, functionality, and combustion behavior of this hydrochar were characterized by SEM, FTIR, and TGA, respectively. In short, it can be concluded that HTC is an effective approach for producing solid fuel from SCG and the resulting hydrochar has the potential to be applied either in domestic heating or large-scale co-firing plants.

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N–self–doped hierarchically porous carbon materials from waste coffee grounds for symmetric supercapacitor

Zeng,

Tan,

Yang

et al. 2024

J Mater Sci: Mater Electron

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Making use of the inherent nitrogen content of spent coffee grounds to create nanostructured activated carbon for supercapacitor and lithium-ion battery applications

Cited by 10 publications

References 39 publications

A state-of-the-art review of N self-doped biochar development in supercapacitor applications

A state-of-the-art review of N self-doped biochar development in supercapacitor applications

Hydrothermal Carbonization of Spent Coffee Grounds for Producing Solid Fuel

N–self–doped hierarchically porous carbon materials from waste coffee grounds for symmetric supercapacitor

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