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2 protocols using nitrilotriacetic acid

1

Synthesis of Porous Zinc Electrode

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Zinc nitrate hexahydrate (Zn(NO3)2·6H2O), 4-nitro phthalic acid (NPA), nitrilotriacetic acid (NTA), N,N-2-methylformamide (DMF), absolute alcohol, potassium hydroxide (KOH), and zinc acetate (Zn(C2H3O2)2) were obtained from Sinopharm Chemical Reagent Co., Ltd. (Beijing, China). Both commercial waterproof carbon paper with a microporous layer (Hesen HCP135) and Pt/C (20 wt.% Pt on Vulcan XC-72) and noble metal catalyst were obtained from Shanghai Hesen Electric Co., Ltd. (Shanghai, China). Zinc foils (99.994%, 0.1 mm) were purchased from Alfa Aesar (Shanghai, China). Nickel foams were obtained from Shenzhen Lvchuang Electronic Technology Co., Ltd. (Shenzhen, China). Nafion (5.0 wt.%) solution was purchased from DuPont Co. (Wilmington, NC, USA.). All the chemicals were directly used as received without further purification, while the zinc foil was polished before use. The deionized water (18.25 Ω cm) was used as a solvent for all aqueous solutions.
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2

Preparation of Inorganic Nutrient Solutions

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Tetrachloroauric(III) acid hydrate [HAuCl4·4H2O, analytical grade (AR)], palladium(II) chloride (PdCl2, AR), potassium dihydrogen phosphate (KH2PO4, AR), disodium hydrogen phosphate dodecahydrate (Na2HPO4, AR), ammonium chloride (NH4Cl, AR), magnesium sulfate (MgSO4, AR), sodium chloride (NaCl, AR), ammonium sulfate [(NH4)2SO4, AR], nitrilotriacetic acid [N(CH2CO2H)3, AR], iron(II) sulfate heptahydrate (FeSO4·7H2O, AR), manganese(II) chloride tetrahydrate (MnCl2·4H2O, AR), cobalt(II) chloride hexahydrate (CoCl2·6H2O, AR), copper(II) sulfate pentahydrate (CuSO4·5H2O, AR), zinc chloride (ZnCl2, AR), nickel(II) chloride hexahydrate (NiCl2·6H2O, AR), boric acid (H3BO3, AR), aluminum potassium sulfate dodecahydrate [AlK(SO4)2·12H2O, AR], and sodium molybdate dihydrate (Na2MoO4·2H2O, AR) were purchased from Sinopharm Chemical Reagent Co. Ltd. Sodium selenite (Na2SeO3, 98%) and sodium tungstate dihydrate purum (NaWO4·2H2O, 99%) were supplied by Sigma-Aldrich. In all of the experiments, ultrapure water with a conductivity of 18.2 megohm·cm was used to dissolve and dilute chemical reagents.
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