Nanoparticles of Mixed-Valence Oxides MnXCO3-XO4 (0 ≤ X ≤ 1) Obtained with Agar-Agar from Red Algae (Rhodophyta) for Oxygen Evolution Reaction

被引：6

作者：

Santos, Jakeline Raiane D. ^{[1
]}

Raimundo, Rafael A. ^{[2
]}

Silva, Thayse R. ^{[3
]}

Silva, Vinicius D. ^{[3
]}

Macedo, Daniel A. ^{[3
]}

Loureiro, Francisco J. A. ^{[4
]}

Torres, Marco A. M. ^{[1
]}

Tonelli, Domenica ^{[5
]}

Gomes, Uilame U. ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Norte, Mat Sci & Engn Postgrad Program, BR-59078970 Natal, RN, Brazil

[2] Univ Fed Paraiba, Dept Phys, BR-58051900 Joao Pessoa, Paraiba, Brazil

[3] Univ Fed Paraiba, Mat Sci & Engn Postgrad Program, BR-58051900 Joao Pessoa, Paraiba, Brazil

[4] UA, Ctr Mech Technol & Automat, Mech Engn Dept, P-3810193 Aveiro, Portugal

[5] UNIBO, Dept Ind Chem Toso Montanari, Ind Chem, Vle Risorgimento 4, I-40136 Bologna, Italy

来源：

NANOMATERIALS | 2022年 / 12卷 / 18期

关键词：

electrocatalyst; green synthesis; proteic sol-gel; mixed-valence oxides; SOL-GEL SYNTHESIS; COBALT OXIDE; HIGH-PERFORMANCE; WATER OXIDATION; ALKALINE-MEDIUM; SPINEL FILMS; ELECTROCHEMICAL PERFORMANCE; HYDROTHERMAL SYNTHESIS; NANOCOMPOSITE FILMS; CO3O4; NANOPARTICLES;

D O I：

10.3390/nano12183170

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The development of efficient electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance in sustainable water-splitting technology for hydrogen production. In this context, this work reports mixed-valence oxide samples of the MnXCo3-XO4 type (0 <= X <= 1) synthesized for the first time by the proteic sol-gel method using Agar-Agar as a polymerizing agent. The powders were calcined at 1173 K, characterized by FESEM, XRD, RAMAN, UV-Vis, FT-IR, VSM, and XPS analyses, and were investigated as electrocatalysts for the oxygen evolution reaction (OER). Through XRD analysis, it was observed that the pure cubic phase was obtained for all samples. The presence of Co3+, Co2+, Mn2+, Mn3+, and Mn4+ was confirmed by X-ray spectroscopy (XPS). Regarding the magnetic measurements, a paramagnetic behavior at 300 K was observed for all samples. As far as OER is concerned, it was investigated in an alkaline medium, where the best overpotential of 299 mV vs. RHE was observed for the sample (MnCo2O4), which is a lower value than those of noble metal electrocatalysts in the literature, together with a Tafel slope of 52 mV dec(-1), and excellent electrochemical stability for 15 h. Therefore, the green synthesis method presented in this work showed great potential for obtaining electrocatalysts used in the oxygen evolution reaction for water splitting.

引用

页数：23

共 10 条

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