TY - JOUR

T1 - Coffee Waste-Derived Nanoporous Carbons for Hydrogen Storage

AU - Stock, Sebastian

AU - Kostoglou, Nikolaos

AU - Selinger, Julian

AU - Sprik, Stefan

AU - Tampaxis, Christos

AU - Charalambopoulou, Georgia

AU - Steriotis, Theodore

AU - Rebholz, Claus

AU - Mitterer, Christian

AU - Paris, Oskar

N1 - Publisher Copyright: © 2022 The Authors. Published by American Chemical Society.

PY - 2022/9/26

Y1 - 2022/9/26

N2 - Biological waste such as residues from the food and beverage industry provides a valuable and abundant resource to be used as a precursor for the synthesis of activated carbons that can be subsequently employed as adsorbents for, e.g., hydrogen storage. Materials with a large specific surface area and pores of appropriate size are necessary to achieve reasonable hydrogen adsorption capacity. Here, we present the repeatable synthesis of activated carbons from coffee waste, i.e., spent coffee grounds and coffee silver skins, on the basis of two independently synthesized batches. The carbonization process under nitrogen gas flow followed by chemical activation with solid potassium hydroxide results in microporous carbons with bimodal pore size distribution and specific surface area up to 3300 and 2680 m2/g based on Brunauer–Emmett–Teller and density functional theory methods, respectively. The materials exhibit excellent hydrogen adsorption performance under cryogenic conditions (77 K), reaching high and fully reversible excess gravimetric hydrogen uptake values of up to 5.79 wt % at 37 bar, and total capacities exceeding 9 wt % at 100 bar.

AB - Biological waste such as residues from the food and beverage industry provides a valuable and abundant resource to be used as a precursor for the synthesis of activated carbons that can be subsequently employed as adsorbents for, e.g., hydrogen storage. Materials with a large specific surface area and pores of appropriate size are necessary to achieve reasonable hydrogen adsorption capacity. Here, we present the repeatable synthesis of activated carbons from coffee waste, i.e., spent coffee grounds and coffee silver skins, on the basis of two independently synthesized batches. The carbonization process under nitrogen gas flow followed by chemical activation with solid potassium hydroxide results in microporous carbons with bimodal pore size distribution and specific surface area up to 3300 and 2680 m2/g based on Brunauer–Emmett–Teller and density functional theory methods, respectively. The materials exhibit excellent hydrogen adsorption performance under cryogenic conditions (77 K), reaching high and fully reversible excess gravimetric hydrogen uptake values of up to 5.79 wt % at 37 bar, and total capacities exceeding 9 wt % at 100 bar.

KW - activated carbons

KW - coffee waste

KW - gas sorption analysis

KW - hydrogen storage

KW - nanoporous structures

KW - X-ray scattering

UR - http://www.scopus.com/inward/record.url?scp=85137663497&partnerID=8YFLogxK

U2 - 10.1021/acsaem.2c01573

DO - 10.1021/acsaem.2c01573

M3 - Article

AN - SCOPUS:85137663497

VL - 5

SP - 10915

EP - 10926

JO - ACS Applied Energy Materials

JF - ACS Applied Energy Materials

SN - 2574-0962

IS - 9

ER -