EXAFS Study on LiFePO<sub>4</sub> Powders Produced From Two Sol-Gel Routes

Negara, V S I; Latif, Chaironi; Wongtepa, Weeraya; Pratapa, Suminar

doi:10.1088/1742-6596/1011/1/012010

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…3 b, e, h ) showed similar oscillations in the low k (3–9 Å -1 ) with R factor of 0.0179, 0.004 and 0.006, respectively. These values were all less than 0.02 47 , 48 , indicating the accuracy of fitting results. The wavelet transform (WT) EXAFS (Fig.…”

Section: Resultsmentioning

confidence: 81%

Tripodal Pd metallenes mediated by Nb2C MXenes for boosting alkynes semihydrogenation

et al. 2023

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Abstract2D metallene nanomaterials have spurred considerable attention in heterogeneous catalysis by virtue of sufficient unsaturated metal atoms, high specific surface area and surface strain. Nevertheless, the strong metallic bonding in nanoparticles aggravates the difficulty in the controllable regulation of the geometry of metallenes. Here we propose an efficient galvanic replacement strategy to construct Pd metallenes loaded on Nb2C MXenes at room temperature, which is triggered by strong metal-support interaction based on MD simulations. The Pd metallenes feature a chair structure of six-membered ring with the coordination number of Pd as low as 3. Coverage-dependent kinetic analysis based on first-principles calculations reveals that the tripodal Pd metallenes promote the diffusion of alkene and inhibit its overhydrogenation. As a consequence, Pd/Nb2C delivers an outstanding turnover frequency of 10372 h−1 and a high selectivity of 96% at 25 oC in the semihydrogenation of alkynes without compromising the stability. This strategy is general and scalable considering the plentiful members of the MXene family, which can set a foundation for the design of novel supported-metallene catalysts for demanding transformations.

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Section: Resultsmentioning

confidence: 81%

Tripodal Pd metallenes mediated by Nb2C MXenes for boosting alkynes semihydrogenation

et al. 2023

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“…3b, 3e and 3h) showed similar oscillations in the low k (3-9 Å −1 ) with R factor of 0.0179, 0.004 and 0.006, respectively. These values were all less than 0.02 42,43 To unveil the intrinsic mechanism of the formation of Pd metallenes, Nb K-edge XANES analysis was conducted and the results were presented in Fig. 3j and Supplementary Table 3.…”

Section: Resultsmentioning

confidence: 99%

Tripodal Pd metallenes mediated by Nb2C MXenes for boosting alkynes semihydrogenation

Zhao

Qiu

Huang

et al. 2022

Preprint

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2D metallene nanomaterials have spurred considerable attention in heterogeneous catalysis by virtue of sufficient unsaturated metal atoms, high specific surface area and surface strain. Nevertheless, the strong metallic bonding in nanoparticles aggravates the difficulty in the controllable regulation of the geometry of metallenes. Here we propose an efficient galvanic replacement strategy to construct Pd metallenes loaded on Nb2C MXenes at room temperature, which is triggered by ultra-strong metal-support interaction based on MD simulation. A combination of electron microscopy, synchrotron X-ray absorption spectroscopy characterizations and theoretical calculations confirm that the Pd metallenes feature a chair structure of six-membered ring with the coordination number of Pd as low as 3. The tripodal Pd metallenes promote the diffusion of alkenes as the effective Pd atoms directly bonded with alkenes decreased compared with traditional Pd (111). As a consequence, the Pd/Nb2C delivers an outstanding turnover frequency of 10372 h− 1 and a high selectivity of 96% at 25 oC in the semihydrogenation of alkynes without compromising the stability. This strategy is general and scalable considering the plentiful members of the MXene family, which can set a foundation for the design of novel supported-metallene catalysts for demanding transformations.

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“…Proses sintesis katoda dengan metode sol-gel telah dilakukan oleh Negara dkk. [19]. Sintesis LiFePO4 dilakukan dengan dua sumber Fe, yaitu bahan komersial (FeCl 2 ·4H 2 O) dan bahan alami yaitu batu besi.…”

Section: Metode Sintesis 21 Metode Sol-gelunclassified

Review : Metode Sintesis Katoda LiFePO4 Baterai Lithium-Ion

2020

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Material katoda merupakan salah satu komponen penting pada baterai berbasis lithium-ion. Material katoda yang digunakan dalam baterai lithium-ion diantaranya LNCA (LiNi0,8Co0,15Al0,05O2), LiCoO2, LiMn2O4, LiFePO4, dan LNCM (LiNi0,3Co0,3Mn0,3O2). Katoda LiFePO4 yang memiliki keunggulan beda tegangan operasi yang tinggi (3,45 V phosphoolivines), kapasitas spesifik tinggi (170 mAh/g), biaya bahan baku murah, ramah lingkungan, kestabilan terhadap panas tinggi, dan dapat diaplikasikan sebagai penyimpanan daya tinggi. Namun, LiFePO4 juga memiliki beberapa kelemahan yaitu memiliki konduktivitas rendah, laju difusi ion Li+ yang lambat, dan kerapatan energi yang rendah. Untuk mengoptimalkan kekurangan tersebut, telah dilakukan sintesis katoda dengan berbagai metode. Artikel ilmiah ini membahas mengenai sintesis katoda LiFePO4 dengan beberapa metode, yaitu presipitasi, solid state, dan sol gel. Selain itu, artikel ini memuat tinjauan (review) mengenai hasil analisa struktur, morfologi, dan performa elektrokimia baterai dengan katoda LiFePO4.

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EXAFS Study on LiFePO₄ Powders Produced From Two Sol-Gel Routes

Cited by 5 publications

References 11 publications

Tripodal Pd metallenes mediated by Nb2C MXenes for boosting alkynes semihydrogenation

Tripodal Pd metallenes mediated by Nb2C MXenes for boosting alkynes semihydrogenation

Tripodal Pd metallenes mediated by Nb2C MXenes for boosting alkynes semihydrogenation

Review : Metode Sintesis Katoda LiFePO4 Baterai Lithium-Ion

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EXAFS Study on LiFePO4 Powders Produced From Two Sol-Gel Routes

Cited by 5 publications

References 11 publications

Tripodal Pd metallenes mediated by Nb2C MXenes for boosting alkynes semihydrogenation

Tripodal Pd metallenes mediated by Nb2C MXenes for boosting alkynes semihydrogenation

Tripodal Pd metallenes mediated by Nb2C MXenes for boosting alkynes semihydrogenation

Review : Metode Sintesis Katoda LiFePO4 Baterai Lithium-Ion

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EXAFS Study on LiFePO₄ Powders Produced From Two Sol-Gel Routes