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Kinetic and thermod...
Kinetic and thermodynamic analysis of ammonia electro-oxidation over alumina supported copper oxide (CuO/Al2O3) catalysts for direct ammonia fuel cells
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- Khan, Safia (författare)
- Shandong Univ, Shandong Technol Ctr Nanodevices & Integrat, Sch Microelect, Jinan 250101, Peoples R China.
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- Ahmad, Awais (författare)
- Univ Lahore, Dept Chem, Lahore, Pakistan.
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- Karri, Rama Rao (författare)
- Univ Teknol Brunei, Fac Engn, Petr & Chem Engn, BE 1410, Bandar Seri Begawan, Brunei.
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- Ouladsmane, Mohamed (författare)
- King Saud Univ, Coll Sci, Dept Chem, Riyadh 11451, Saudi Arabia.
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- Janjua, Naveed Kausar (författare)
- Quaid i Azam Univ, Dept Chem, Islamabad 45320, Pakistan.
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- Li, Hu, 1986- (författare)
- Uppsala universitet,Tillämpad materialvetenskap,Shandong Univ, Shandong Technol Ctr Nanodevices & Integrat, Sch Microelect, Jinan 250101, Peoples R China; Shandong Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China
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Shandong Univ, Shandong Technol Ctr Nanodevices & Integrat, Sch Microelect, Jinan 250101, Peoples R China Univ Lahore, Dept Chem, Lahore, Pakistan. (creator_code:org_t)
- Elsevier, 2024
- 2024
- Engelska.
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Ingår i: International journal of hydrogen energy. - : Elsevier. - 0360-3199 .- 1879-3487. ; 52, s. 1206-1216
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- In this work, ammonia electrooxidation (AEO) is studied to probe the electrochemical behavior of aqueous NH3 as direct fuel by implication of gamma alumina supported copper oxide catalysts (CuO/Al2O3). Precipitation and impregnation techniques are adapted to synthesize the substrate Al2O3, and loading of different ratios (1%, 2%, 3%, 4%) of active precursor i.e., CuO, respectively. Small average crystallite sizes (DAvg) in range of 1.46–6.76 nm and smaller particle sizes from micrographs proposed a superb activity of the catalysts. Modified GCE exhibited the excellent conductive properties towards standard redox probe K4[Fe(CN)6] and KCl, displaying a high active electrochemical surface area of up to 0.0021 cm2. Current profiles in response to increase in scan rates, concentrations of ammonia and temperature have been observed in 0.1 M KOH, thereby estimating the thermodynamic and kinetic constraints of the AEO process. Attributed to the electroactive properties towards AEO, CuO/Al2O3 is found to exhibit the desirable physiochemical properties owing to large oxidation current, large diffusion coefficient “D°” (3.6 × 10-9 cm2 s-1), large rate constant “ko” (1.2 × 10-5 cm s-1), large system entropy “ΔS” (-108 J K-1 mol-1), high change in enthalpy “ΔH” (72.3 J mol-1) and low activation energy “ΔG” (32.8 kJ mol-1). Resultingly, the oxidation of ammonia is found to be facile and robust by incorporation of CuO/Al2O3 catalysts owing to large ko, ΔH and ΔH. This study opened a gateway towards eco-benign and economical efficient energy generation and viable market entry of direct ammonia fuel cells.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Nyckelord
- Alumina
- Copper oxide
- Cyclic voltammetry
- Electrode
- Ammonia electro-oxidation
- Ammonia fuel cell
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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