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10 protocols using nickel 2 nitrate hexahydrate

1

Preparation and Characterization of Nickel-Loaded Seashell

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Nickel (II) nitrate hexahydrate (CAS 13478-00-7 99.5%, wt.%), potassium hydroxide (CAS 1310-58-3, ≥99.0 wt.%), and hydrochloric acid (CAS 7641-01-0, 36.0 wt.%) were purchased from Sinopharm Ltd. (Hangzhou, China). N2 (CAS 7727-37-9,99.9%) and CO2 (CAS 124-38-999.99%) gases were purchased from Hangzhou Special Gas Co., Ltd. (Hangzhou, China). SH was sampled from a coastal area in Wenzhou, Zhejiang province, China. SH was washed with deionized water several times and dried, which was followed by grinder crushing and sieving to select particle sizes in the range of 400–600 μm. The pretreated SH was carefully oven-dried at 105 °C for 12 h to eliminate moisture before use.
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2

Synthesis of Metal Nanoparticles

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Nickel(II) nitrate hexahydrate [Ni(NO3)2·6H2O] and iron(III) nitrate nonahydrate [Fe(NO3)3·6H2O] were purchased from Sinopharm. Sodium borohydride (NaBH4, 99%) was purchased from Acros Organics. Sodium hydroxide (AR 96%) was purchased from Aladdin. All chemicals were used as received without further purification.
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3

Synthesis of Graphite-based Nanocomposites

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The graphite was obtained from Sigma-Aldrich (282863). Iron(iii) nitrate nonahydrate, nickel(ii) nitrate hexahydrate, and d-glucose were ordered from Sinopharm Chemical Reagent Co. Ltd, China. Alcohol was purchased from Tianjin Tiantai Fine Chemical Reagent Co. Ltd, China. All chemicals were analytical grade and used directly without further purifying treatments. Deionized water was employed to prepare the solutions throughout.
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4

Synthesis of Cobalt-Nickel-Selenium Catalysts

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Cobalt (II) nitrate hexahydrate (Co(NO3)2·6H2O, AR), nickel (II) nitrate hexahydrate (Ni(NO3)2·6H2O, AR), 2-methylimidazole (2-MI, C4H6N2, AR) were purchased from Sinopharm Chemical Reagent Co., Ltd. N,N-Dimethylformamide (C3H7NO, DMF, AR) was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. Selenium powder (Se, 99%) and polyacrylonitrile (PAN, Mw¯ = 150,000, 99%) were purchased from Shanghai Macklin Biochemical Co., Ltd. All chemicals were of analytical grade and used without further purification.
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5

Synthesis of Nickel and Iron Compounds

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Nickel(ii) acetate tetrahydrate (Ni(OAc)2·4H2O, ≥ 98.0%), iron(ii) sulfate heptahydrate (FeSO4·7H2O, 99.0–101.0%), nickel(ii) nitrate hexahydrate (Ni(NO3)2·6H2O, 98%), iron(iii) nitrate nonahydrate (Fe(NO3)3·9H2O, ≥ 98.5%), ammonium fluoride (NH4F, ≥96.0%), urea (CH4N2O, 99%) and N,N-dimethylacetamide (DMAC) were purchased from Sinopharm Chemical Reagent Co. Ltd (Shanghai, China). All the chemicals were used without further purification.
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6

Synthesis of Metal-Organic Frameworks

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All chemicals were used without further purification unless otherwise specified. p-Phenylenediamine, 4-bromobenzonitrile, and tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole-1-carboxylate were supplied by Energy Chemical. Gold trichloride and tetrakis(triphenylphosphine)palladium were bought from Sigma-Aldrich. 3,3′,5,5′-Azobenzene tetra carboxylic acid, trimesic acid, and terephthalic acid were purchased from Acmec. Sodium hydroxide, iron(III) chloride hexahydrate (97%), copper(II) nitrate trihydrate (99%), nickel(II) nitrate hexahydrate (99%), sodium nitrate (99%), magnesium(II) nitrate hexahydrate (99%), potassium nitrate, zinc(II) nitrate hexahydrate (99%), potassium carbonate, sodium carbonate, sodium sulfate, and all solvents were provided by Sinopharm Chemical Reagent Co. Ltd. The Yangtze River water was collected in Nanjing, China (latitude: 32.156613, longitude: 118.800723). The East China Sea water was collected in Xiamen, China (latitude: 24.442217, longitude: 118.075667).
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7

Synthesis of Nanostructured Catalysts

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Hydrochloric acid (HCl), Urea (99 wt.%), Hydrazine monohydrate (N2H4·H2O, 80 wt.%), Cobalt(II) nitrate hexahydrate (Co(NO3)2•6H2O, 98.5 wt.%) and Nickel(II) nitrate hexahydrate (Ni(NO3)2•6H2O, 98.0 wt.%) were purchased from Sinopharm Group Chemical Reagent Co., Ltd. Sodium hypophosphite (NaH2PO2, 99.0 wt.%) and Ammonium fluoride (NH4F, 98 wt.%) were purchased from Aladdin. Sodium hydroxide (KOH, 90 wt.%) was purchased from Shanghai Titan Scientific Co., Ltd. Acetone, Ethanol, Isopropanol were purchased from Shanghai Lingfeng. Nafion D-520 dispersion (5 wt.%) was purchased from Dupont China Holding Co., Ltd. Commercial 20 wt.% Pt/C and the carbon black (XC-72) were purchased from Shanghai HEPHAS Energy Equipment Co., Ltd. Nickel foam (thickness: 1.0 mm; aperture: 0.1 mm; porosity: 97.2%) was purchased from Cyber Electric Co., Ltd. Anion exchange membrane (AEM, FAB-PK-130) was purchased from Fumasep. Composite matrix was purchased from Changsha Sipulin. All materials were used as received without further purification.
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8

Synthesis of Metal Nitrate Nanocomposites

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Nickel(ii) nitrate hexahydrate [Ni(NO3)2·6H2O, 98.0%], cobalt(ii) nitrate hexahydrate [Co(NO3)2·6H2O, 99.0%], iron(ii) nitrate nonahydrate [Fe(NO3)2·9H2O, 98.0%], ammonium fluoride [NH4F, ≥98.0%] and urea [CO(NH2)2, ≥98.0%] were procured from Sinopharm Chemical Reagent Co., Ltd, while oleylamine [C18H37N, 99.0%] and ethanol (C2H5OH; 99.9 wt%) were purchased from Aladdin Reagent Co. Ltd. Potassium hydroxide [KOH, ≥95%] was obtained from Alfa Aesar. The deionized (DI) water used in this study was obtained from a Millipore Autopure system with a resistivity of 18.25 MΩ cm−1. All other materials were of analytical grade and did not require further purification before use.
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9

Synthesis of Ni/Co-Based Nanocomposites

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Nickel(II)
nitrate hexahydrate (Ni(NO3)2·6H2O), cobalt(II) nitrate hexahydrate (Co(NO3)2·6H2O), urea (CH4N2O), ammonium
thiotungstate (H8N2S4W), N,N-dimethylformamide (DMF), PVA, and KOH
were purchased from Sinopharm Chemical Reagent Co., Ltd. All the chemical
reagents were AR grade and used without further purification. CC (WOS1002
from CeTech) was obtained and treated with double distilled water
and ethanol.
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10

Synthesis of Metal-Organic Framework Catalysts

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Nickel(ii) nitrate hexahydrate (Ni(NO3)2·6H2O, 98%), cobalt(ii) nitrate hexahydrate (Co(NO3)2·6H2O, 98.5%), 1,4-benzenedicarboxylic acid (H2BDC, 99%), 4,4′-bipyridine (4,4′-bipy, 98%), sodium hydroxide (NaOH, 96%) were purchased from Sinopharm Chemical Reagent Co. Ltd (Shanghai, China). Commercial iridium oxide (IrO2, 99.9%) was purchased from Aladdin (Shanghai, China). Nafion (5 wt%) was purchased from Sigma-Aldrich (Beijing, China). The water for experiments was deionized (DI) water (18 MΩ). Other chemicals and solvents used in this work were obtained from commercial suppliers and used without further purification.
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