کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8012968 | 1517164 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhancement of the performance in Li-O2 cells of a NiCo2O4 based porous positive electrode by Cr(III) doping
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Enhancement of the performance in Li-O2 cells of a NiCo2O4 based porous positive electrode by Cr(III) doping Enhancement of the performance in Li-O2 cells of a NiCo2O4 based porous positive electrode by Cr(III) doping](/preview/png/8012968.png)
چکیده انگلیسی
Here we discuss the incorporation of Cr(III) as dopant in the spinel lattice of the NiCo2O4 cubic phase and its beneficial effect on the electro-catalytic activity of this material in aprotic Li-O2 cells. To this aim, we synthesized highly porous carbon-free self-standing electrodes constituted by nanostructured undoped and Cr-doped NiCo2O4 grown on open nickel mesh. These materials were characterized by X-ray diffraction, field emission scanning electron microscopy coupled with energy dispersive spectroscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The performance in aprotic Li-O2 cells of the undoped and Cr-doped NiCo2O4 electrodes were tested in galvanostatic cycling using a LiTFSI 1â¯m in tetraethylene glycol dimethyl ether electrolyte without the incorporation of any carbon conductive agent. Cr(III) doping discloses a remarkable enhancement of more than 300% of the discharge capacity at Jâ¯=â¯0.1â¯mAâ¯cmâ2. Moreover, the Cr-doped NiCo2O4 material is capable to give reversible limited capacity ORR/OER for 52 and 45 cycles at 0.2â¯mAâ¯cmâ2/0.1â¯mAhâ¯cmâ2 and 0.1â¯mAâ¯cmâ2/0.2â¯mAhâ¯cmâ2, respectively, without oxygen flow in static Ar/O2 overpressures (pO2â¯=â¯1bar). Pseudo-Tafel data derived by galvanostatic titrations highlight the beneficial effect of Cr(III) doping on the electrode kinetics both for ORR and OER.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 224, 1 August 2018, Pages 113-117
Journal: Materials Letters - Volume 224, 1 August 2018, Pages 113-117
نویسندگان
Daniela Giacco, Andrea Giacomo Marrani, Sergio Brutti,