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Kwon S, Lee JH. Temperature Effect on the Topotatic Synthesis of Spinel
MnCoO
Nanoparticles for Efficient Oxygen Reduction Electrocatalyst. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12260] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Sunglun Kwon
- Department of Chemistry The Catholic University of Korea Bucheon 14662 South Korea
| | - Jong Hyeon Lee
- Department of Chemistry The Catholic University of Korea Bucheon 14662 South Korea
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Li C, Li X, Sun X, Zhang X, Duan L, Yang X, Wang L, Lü W. Porous Carbon Networks Derived From Graphitic Carbon Nitride for Efficient Oxygen Reduction Reaction. NANOSCALE RESEARCH LETTERS 2019; 14:249. [PMID: 31342197 PMCID: PMC6656852 DOI: 10.1186/s11671-019-3073-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 07/04/2019] [Indexed: 05/25/2023]
Abstract
Great efforts have been dedicated to finding economic and efficient oxygen reduction reaction (ORR) for fuel cell technology. Among various catalysts, N-doped carbon-based nanomaterials have attracted much attention due to low-cost, noble metal free, and good durability. Herein, we developed a facile and economic strategy to prepare nitrogen-doped carbon networks for efficient ORR application. The g-C3N4 is used as the template and N source, and dopamine is used as the carbon source. By simple hydrothermal treatment and sintering, N-doped carbon network structures with high specific surface area, effective ORR activity, and superior durability could be acquired. The present strategy is free of involving generally multistep, poisonous reagents, and complication of removing template for fabrication of 3D carbon structures.
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Affiliation(s)
- Chenxia Li
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun, 130012 China
| | - Xuesong Li
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun, 130012 China
| | - Xiaojuan Sun
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130012 China
| | - Xueyu Zhang
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun, 130012 China
| | - Lianfeng Duan
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun, 130012 China
| | - Xijia Yang
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun, 130012 China
| | - Liying Wang
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun, 130012 China
| | - Wei Lü
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun, 130012 China
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Nishikawa H, Yano H, Inukai J, Tryk DA, Iiyama A, Uchida H. Effects of Sulfate on the Oxygen Reduction Reaction Activity on Stabilized Pt Skin/PtCo Alloy Catalysts from 30 to 80 °C. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13558-13564. [PMID: 30378419 DOI: 10.1021/acs.langmuir.8b02945] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The effects of the concentration of H2SO4 ([H2SO4]), which is the major decomposition product of polymer electrolyte membranes during the operation of fuel cells, on the performance of stabilized Pt skin/PtCo alloy nanocatalysts supported on high-surface-area carbon (PtxAL-PtCo/C) were investigated. Kinetically controlled activities for the oxygen reduction reaction (ORR) and the H2O2 yields ( P(H2O2)) on the PtxAL-PtCo/C were examined based on hydrodynamic voltammograms in O2-saturated 0.1 M HClO4 + X M H2SO4 ( X = 0 to 5 × 10-2) by use of the channel flow double electrode method at temperatures between 30 and 80 °C. At X ≤ 10-6 (1 μM) and all temperatures examined, the apparent ORR rate constants kapp@0.85 V (per unit electrochemically active surface area) on PtxAL-PtCo/C at 0.85 V vs the reversible hydrogen electrode (RHE) were nearly identical with those in sulfate-free 0.1 M HClO4 and were at least twice as high as those on a commercial Pt/C catalyst (c-Pt/C). The values of kapp@0.85 V on both PtxAL-PtCo/C and c-Pt/C decreased linearly with log[H2SO4] in the concentration range 10-6 < X ≤ 5 × 10-2. The detrimental effect by H2SO4 was less pronounced on PtxAL-PtCo/C than on c-Pt/C at high temperatures; the kapp@0.85 V value at X = 5 × 10-2 on the former at 80 °C was maintained as high as 87%, whereas that of the latter was 66% (34% loss). The values of peroxide production percentage P(H2O2) on PtxAL-PtCo/C at 80 °C were nearly constant (ca. 0.22% at 0.76 V vs RHE) up to X = 5 × 10-2. These superior characteristics are ascribed to weakened adsorption of sulfate on the Pt skin surface, supported by DFT calculations, which provides the great advantage of robustness in the presence of impurities, maintaining active sites for the ORR during the PEFC operation.
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Affiliation(s)
| | - Hiroshi Yano
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
| | - Junji Inukai
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
| | - Donald A Tryk
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
| | - Akihiro Iiyama
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
| | - Hiroyuki Uchida
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
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