Ag/Biochar composite for supercapacitor electrodes

Biochar (BCH) is a carbon-based bio-material produced from thermochemical conversion of biomass. Several activation or functionalization methods are usually used to improve physicochemical and functional properties of BCHs. In the context of green and sustainable future development, activated and functionalized biochars with abundant surface functional groups and large surface area can act as effective catalysts or catalyst supports for chemical transformation of a range of bioproducts in biorefineries. Above the well-known BCH applications, their use as adsorbents to remove pollutants are the mostly discussed, although their potential as catalysts or catalyst supports for advanced (electro)catalytic processes has not been comprehensively explored. In this review, the production/activation/functionalization of metal-supported biochar (M-BCH) are scrutinized, giving special emphasis to the metal-functionalized biochar-based (electro)catalysts as promising catalysts for bioenergy and bioproducts production. Their performance in the fields of biorefinery processes, and energy storage and conversion as electrode materials for oxygen and hydrogen evolutions, oxygen reduction, and supercapacitors, are also reviewed and discussed.

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“…Fresh bamboo strip Carbonization at 650 • C for 2 h in N 2 atmosphere with heating rate of 3 solution 489 (11) 5.8/619 [136] Luffa plant…”

Section: Ultrasonic Dispersion Inmentioning

confidence: 99%

Metal-Supported Biochar Catalysts for Sustainable Biorefinery, Electrocatalysis, and Energy Storage Applications: A Review

et al. 2022

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“…Voluminous experiments have been carried out to study the performance of microbial fuel cells with electrode prepared from carbonaceous materials such as activated carbon and carbon nanomaterials (Logan et al 2007;Frackowiak and Béguin 2001). Kouchachvili and Entchev (2017) produced biochar from sewage sludge and dairy manure; exposed it to adsorb Ni from aqua solution; and later subjected it (Ni-loaded biochar) to microwave treatment to produce a supercapacitor out of it. It was observed that the properties of the supercapacitor increased with Ni loading.…”

Section: Other Modern Applicationsmentioning

confidence: 99%

Production, activation, and applications of biochar in recent times

Sakhiya

Anand

Kaushal

2020

Biochar

272

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Biomass is a green energy source and is available in abundance. Biochar is a carbon-rich material derived from a wide range of biomass or organic waste through the thermochemical route. Biochar has received increasing attention because of its distinctive properties such as high carbon content, greater specific surface area, cation exchange capacity, nutrient retention capacity, and stable structure. This review paper extensively studies and reports the different pyrolysis processes, reactor types, the effect of process parameters on biochar yield, and its physicochemical properties, biochar activation methods, and applications. It also details the status of the research and development (R&D) progress in biochar production through conventional and advanced technologies. The study found that unlike many products (at R&D stage) biochar has high potential to scale up and has a direct impact on crop yield, water purification (for domestic and industrial application), alternative fuels (clean solid fuel for cookstove), air purification, catalyst, biogas production, purification, and storage. In addition, the paper lists the merits and challenges in the novel biochar applications like hydrogen storage, electrochemical capacitor, and fuel cell technology.

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“…Kouchachvili et. al., [52] developed a promising carbon electrode material Ag/BC for SCs by incorporation of silver into HNO3 activated biochar. The silver content in biochar increased the electrochemical performance and electrical conductivity of biochar composite.…”

Section: Metal Impregnationmentioning

confidence: 99%