Evaluation and selection of biochars and hydrochars derived from agricultural wastes for the use as adsorbent and energy storage materials

Lang, Jaroslav; Matějová, Lenka; Cuentas-Gallegos, Ana Karina; Lobato-Peralta, Diego Ramón; Ainassaari, Kaisu; Gómez, Mónica; Solis, J. L.; Mondal, Debapriya; Keiski, Riitta L.; Cruz, Gerardo J. F.

doi:10.1016/j.jece.2021.105979

Cited by 38 publications

(18 citation statements)

References 113 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even at a high‐power density of 13697 W kg −1 , the energy density of NPS‐CN 2 still retains 6.1 Wh kg −1 . The energy density of NPS‐CN 2 capacitor is higher than those reported in literature [41–46] . The ideal Nyquist diagram is a straight line perpendicular to the Z′ axis [46] .…”

Section: Resultsmentioning

confidence: 64%

“…The energy density of NPS-CN 2 capacitor is higher than those reported in literature. [41][42][43][44][45][46] The ideal Nyquist diagram is a straight line perpendicular to the Z' axis. [46] In the low-frequency region, the Nyquist curves of CN electrodes are almost ChemElectroChem perpendicular to the Z' axis, indicating the ideal EDLC characteristics (Figure 3e).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of N/P/S Co‐Doped 3D Cross‐Linked Carbon Nanosheets by Double Activation Method for High‐Performance Supercapacitors

et al. 2022

View full text Add to dashboard Cite

It is still a challenge to prepare heteroatoms‐doped carbon materials for supercapacitors by an acid‐free and alkali‐free synthesis method. Herein, the N/P/S co‐doped carbon nanosheets (NPS‐CNs) were synthesized by an in‐situ K2CO3 and Na2S2O3 ⋅ 5H2O double activation method from pyrene as carbon source, melamine‐phytic acid supramolecular aggregate as N and P source without the presence of acid and alkali. The as‐prepared NPS‐CN featured three‐dimensional cross‐linked nanosheets with abundant pores, boosting the stability of carbon skeleton and promoting the transfer of ion and electron. The abundant micropores together with high heteroatom content (15.09 %) provided abundant active sites and defects for ion adsorption. Benefitting from these merits, the NPS‐CN electrode exhibits a high specific capacitance of 485.1 F g−1 at 0.05 A g−1 as well as good rate performance of 350.3 F g−1 at 20 A g−1 in three electrode system. Simultaneously, the specific capacitance of the NPS‐CN capacitor reached 305.0 F g−1 at 0.05 A g−1 and retained 201.2 F g−1 at 100 A g−1 in two electrode system. Importantly, NPS‐CN capacitor presented an excellent cycle stability (93.4 % of initial capacitance after 30,000 charge/discharge cycles). This work opened a less harmful route to prepare NPS‐CNs from small polycyclic aromatic hydrocarbons for energy storage devices.

show abstract

Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Synthesis of N/P/S Co‐Doped 3D Cross‐Linked Carbon Nanosheets by Double Activation Method for High‐Performance Supercapacitors

et al. 2022

View full text Add to dashboard Cite

show abstract

“…For example, the use of hydrochar made of kitchen waste has been reported with a high potential for energy storage (Zhou et al, 2021). Researchers have found that hydrochar, as a supercapacitor, surpassed the performance of commercial activated carbon, reaching specific energy values 6.66 and 8.52 Wh/kg in acidic and neutral electrolytes, respectively (Lang et al, 2021). The effect of HTC variables on the performance of the hydrochar produced, though, remains poorly understood and has been identified as an important knowledge gap that merits further exploration to optimize the process and produce the best materials for energy storage.…”

Section: Hydrochar and Circular Economymentioning

confidence: 99%

Hydrochar: A Promising Step Towards Achieving a Circular Economy and Sustainable Development Goals

et al. 2022

View full text Add to dashboard Cite

The United Nations 17 Sustainable Development Goals (SDGs) are a universal call to action to end poverty, protect the environment, and improve the lives and prospects of everyone on this planet. However, progress on SDGs is currently lagging behind its 2030 target. The availability of water of adequate quality and quantity is considered as one of the most significant challenges in reaching that target. The concept of the ‘Circular Economy’ has been termed as a potential solution to fasten the rate of progress in achieving SDGs. One of the promising engineering solutions with applications in water treatment and promoting the concept of the circular economy is hydrochar. Compared to biochar, hydrochar research is still in its infancy in terms of optimization of production processes, custom design for specific applications, and knowledge of its water treatment potential. In this context, this paper critically reviews the role of hydrochar in contributing to achieving the SDGs and promoting a circular economy through water treatment and incorporating a waste-to-value approach. Additionally, key knowledge gaps in the production and utilization of engineered hydrochar are identified, and possible strategies are suggested to further enhance its water remediation potential and circular economy in the context of better natural resource management using hydrochar. Research on converting different waste biomass to valuable hydrochar based products need further development and optimization of parameters to fulfil its potential. Critical knowledge gaps also exist in the area of utilizing hydrochar for large-scale drinking water treatment to address SDG-6.

show abstract

“…The use of biomass has emerged as a promising low-cost solution [ 38 ] for the treatment and management of large volumes of agro-industrial wastes [ 39 , 40 ]. In this sense, biochar comes from a wide range of biomass, such as fruit, legume peels and husks [ 41 , 42 , 43 , 44 , 45 ], bagasse/pomace, fruit pit and shells [ 46 , 47 , 48 , 49 , 50 ], forestry wastes and pruning [ 51 , 52 , 53 ], sludge [ 54 , 55 ] and animal manure [ 56 , 57 ]. The biochar obtention releases more hydrogen than it consumes, making it a negative-emission technology [ 58 ].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

et al. 2022

View full text Add to dashboard Cite

This work valorizes butiá pomace (Butia capitata) using pyrolysis to prepare CO2 adsorbents. Different fractions of the pomace, like fibers, endocarps, almonds, and deoiled almonds, were characterized and later pyrolyzed at 700 °C. Gas, bio-oil, and biochar fractions were collected and characterized. The results revealed that biochar, bio-oil, and gas yields depended on the type of pomace fraction (fibers, endocarps, almonds, and deoiled almonds). The higher biochar yield was obtained by endocarps (31.9%wt.). Furthermore, the gas fraction generated at 700 °C presented an H2 content higher than 80%vol regardless of the butiá fraction used as raw material. The biochars presented specific surface areas reaching 220.4 m2 g−1. Additionally, the endocarp-derived biochar presented a CO2 adsorption capacity of 66.43 mg g−1 at 25 °C and 1 bar, showing that this material could be an effective adsorbent to capture this greenhouse gas. Moreover, this capacity was maintained for 5 cycles. Biochars produced from butiá precursors without activation resulted in a higher surface area and better performance than some activated carbons reported in the literature. The results highlighted that pyrolysis could provide a green solution for butiá agro-industrial wastes, generating H2 and an adsorbent for CO2.

show abstract

Evaluation and selection of biochars and hydrochars derived from agricultural wastes for the use as adsorbent and energy storage materials

Cited by 38 publications

References 113 publications

Synthesis of N/P/S Co‐Doped 3D Cross‐Linked Carbon Nanosheets by Double Activation Method for High‐Performance Supercapacitors

Synthesis of N/P/S Co‐Doped 3D Cross‐Linked Carbon Nanosheets by Double Activation Method for High‐Performance Supercapacitors

Hydrochar: A Promising Step Towards Achieving a Circular Economy and Sustainable Development Goals

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

Contact Info

Product

Resources

About