Mn2O3 doping induced the improvement of catalytic performance for oxygen reduction of MnO

Wu, Xiaoying; Gao, Xueping; Xu, Luping; Huang, Taizhong; Yu, Jiemei; Wen, Changlan; Chen, Zhonghe; Han, Jisheng

doi:10.1016/j.ijhydene.2016.04.216

Cited by 22 publications

(3 citation statements)

References 38 publications

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“…Moreover, the catalyst of Mn 2 O 3 -doped MnO supported by reduced grapheme oxide (rGO) was proved to have a better ORR catalytic performance and stronger stability than that of pure MnO. It was believed that the coexisted metal oxide with different valences and rGO had promoted the catalytic performance [ 20 ]. In addition, carbon is one of the most important materials for electron transfer, and it could improve the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Spherical α-MnO2 Supported on N-KB as Efficient Electrocatalyst for Oxygen Reduction in Al–Air Battery

Chen

Wang

et al. 2018

Materials

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Traditional noble metal platinum (Pt) is regarded as a bifunctional oxygen catalyst due to its highly catalytic efficiency, but its commercial availability and application is often restricted by high cost. Herein, a cheap and effective catalyst mixed with α-MnO2 and nitrogen-doped Ketjenblack (N-KB) (denoted as MnO2-SM150-0.5) is examined as a potential electrocatalyst in oxygen reduction reactions (ORR) and oxygen evolution reactions (OER). This α-MnO2 is prepared by redox reaction between K2S2O8 and MnSO4 in acid conditions with a facile hydrothermal process (named the SM method). As a result, MnO2-SM150-0.5 exhibits a good catalytic performance for ORR in alkaline solution, and this result is comparable to a Pt/C catalyst. Moreover, this catalyst also shows superior durability and methanol tolerance compared with a Pt/C catalyst. It also displays a discharge voltage (~1.28 V) at a discharge density of 50 mA cm−2 in homemade Al–air batteries that is higher than commercial 20% Pt/C (~1.19 V). The superior electrocatalytic performance of MnO2-SM150-0.5 could be attributed to its higher Mn3+/Mn4+ ratio and the synergistic effect between MnO2 and the nitrogen-doped KB. This study provides a novel strategy for the preparation of an MnO2-based composite electrocatalyst.

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Section: Introductionmentioning

confidence: 99%

Spherical α-MnO2 Supported on N-KB as Efficient Electrocatalyst for Oxygen Reduction in Al–Air Battery

Chen

Wang

et al. 2018

Materials

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“…Based on the RRDE tests, the electron transfer number and the percentage of H 2 O 2 were calculated according to the Eqs. (7) and :

true n = \frac{{4 \times I}_{d}}{I_{d} + I_{r} / N}

true H_{2} O_{2} = 200 \times \frac{I_{r} / N}{I_{d} + I_{r} / N}

…”

Section: Resultsmentioning

confidence: 99%

Investigation on the Catalytic Performance of Reduced‐Graphene‐Oxide‐Interpolated FeS₂ and FeS for Oxygen Reduction Reaction

et al. 2018

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The oxygen reduction reaction (ORR) plays a key role in many kinds of energy conversion and energy storage devices, especially in fuel cells. Developing low‐cost, easily prepared, and high‐efficiency catalysts is a crucial factor for the large‐scale applications of fuel cells. Herein, we report the reduced graphene oxide (rGO) interpolated FeS2 and FeS as low cost and high performance electrocatalyst for ORR in the alkaline electrolyte. Cyclic voltammetry tests indicate that the onset potential of the ORR for FeS2@rGO is −0.142 V, which is close to the state‐of‐the‐art commercial Pt/C (‐0.114 V) catalyst. A low Tafel slope of ∼ 98 mV/decade and high durability are also observed for the FeS2@rGO composite for ORR. The reaction kinetics study shows that the rGO‐interpolated FeS2 catalyzed ORR major happen through 4‐electron pathway, but the rGO‐interpolated FeS catalyzed ORR major happen through mixed 2‐electron and 4‐electron pathway. The S−S bond of FeS2 play the major role for the happening of ORR through 4‐electron pathway.

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“…Comparison of the ORR electrochemical performances of MnO/PC nanohybrid with the reported catalysts and Pt/C; Table S2: Determination of HQ in real sample using our colorimetrical method. References [54][55][56][57][58][59][60][61] are cited in the Supplementary Materials. Institutional Review Board Statement: Ethical review and approval were waived for this study because no experiment involved humans or animals.…”

Section: Supplementary Materialsmentioning

confidence: 99%

Fungus-Based MnO/Porous Carbon Nanohybrid as Efficient Laccase Mimic for Oxygen Reduction Catalysis and Hydroquinone Detection

Zhang

2022

Nanomaterials

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Developing efficient laccase-mimicking nanozymes via a facile and sustainable strategy is intriguing in environmental sensing and fuel cells. In our work, a MnO/porous carbon (MnO/PC) nanohybrid based on fungus was synthesized via a facile carbonization route. The nanohybrid was found to possess excellent laccase-mimicking activity using 2,2′-azinobis (3-ethylbenzthiazoline-6-sulfonic acid) diammonium salt (ABTS) as the substrate. Compared with the natural laccase and reported nanozymes, the MnO/PC nanozyme had much lower Km value. Furthermore, the electrochemical results show that the MnO/PC nanozyme had high electrocatalytic activity toward the oxygen reduction reaction (ORR) when it was modified on the electrode. The hybrid nanozyme could catalyze the four-electron ORR, similar to natural laccase. Moreover, hydroquinone (HQ) induced the reduction of oxABTS and caused the green color to fade, which provided colorimetric detection of HQ. A desirable linear relationship (0–50 μM) and detection limit (0.5 μM) were obtained. Our work opens a simple and sustainable avenue to develop a carbon–metal hybrid nanozyme in environment and energy applications.

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Mn2O3 doping induced the improvement of catalytic performance for oxygen reduction of MnO

Cited by 22 publications

References 38 publications

Spherical α-MnO2 Supported on N-KB as Efficient Electrocatalyst for Oxygen Reduction in Al–Air Battery

Spherical α-MnO2 Supported on N-KB as Efficient Electrocatalyst for Oxygen Reduction in Al–Air Battery

Investigation on the Catalytic Performance of Reduced‐Graphene‐Oxide‐Interpolated FeS₂ and FeS for Oxygen Reduction Reaction

Fungus-Based MnO/Porous Carbon Nanohybrid as Efficient Laccase Mimic for Oxygen Reduction Catalysis and Hydroquinone Detection

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Mn2O3 doping induced the improvement of catalytic performance for oxygen reduction of MnO

Cited by 22 publications

References 38 publications

Spherical α-MnO2 Supported on N-KB as Efficient Electrocatalyst for Oxygen Reduction in Al–Air Battery

Spherical α-MnO2 Supported on N-KB as Efficient Electrocatalyst for Oxygen Reduction in Al–Air Battery

Investigation on the Catalytic Performance of Reduced‐Graphene‐Oxide‐Interpolated FeS2 and FeS for Oxygen Reduction Reaction

Fungus-Based MnO/Porous Carbon Nanohybrid as Efficient Laccase Mimic for Oxygen Reduction Catalysis and Hydroquinone Detection

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Investigation on the Catalytic Performance of Reduced‐Graphene‐Oxide‐Interpolated FeS₂ and FeS for Oxygen Reduction Reaction