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3 protocols using nitric acid

1

Chitosan-Based Catalytic Nanocomposites

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Chitosan (low Mw of 50–190 kDa, 75%–85% deacetylated), sodium borohydride (98%), 4‑nitrophenol (ReagentPlus, >99%), K2PdCl4 (98%), PtCl4 (96%) were purchased from Sigma–Aldrich (Saint Louis, MO, USA); polyhydroxybutyrate (PHB, Biomer P209) from Biomer (Krailing, Germany); nitric acid (65%) from Lach-ner (Neratovice, Czech Republic). Deionized water (DI; 18.2 MΩ·cm–1, ELGA, Veolia Water, Marlow, UK) was used in all of the experiments.
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2

Synthesis of Graphite Fluoride Electrodes

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Graphite fluoride (>61 wt % F), sodium cyanide (p.a. ≥ 97%), N,N-dimethylformamide (≥98%), sodium sulfate (p.a. ≥ 99%) and potassium hydroxide (BioXtra ≥85%) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Nitric acid (Analpure 65%) and sulfuric acid (p.a. 96%) were obtained from Lach-Ner. Acetone (pure) and ethanol (absolute) were purchased from Penta, Czech Republic. All chemicals were used as delivered without any further purification. Ultrapure water (18 MΩ cm−1) was used for the preparation of all aqueous electrolyte solutions.
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3

Synthesis of Polymer Composite Material

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Nafion 117 solution
(5 wt %), NaCN (p.a. ≥97%), and graphite fluoride (>61 wt
%
F, C1F1.1) were purchased from Sigma-Aldrich.
Acetone (pure) and ethanol (absolute) were purchased from Penta. Amine-free
dimethylformamide (DMF) and nitric acid (Analpure, 65%) were obtained
from Lach-Ner. All aqueous solutions were prepared with ultrapure
water (18 MΩ cm–1).
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