Ultrathin MnO2 nanosheets for optimized hydrogen evolution via formaldehyde reforming in water at room temperature

Miao, Lei; Nie, Qing; Wang, Jinlong; Zhang, Gaoke; Zhang, Pengyi

doi:10.1016/j.apcatb.2019.02.047

Cited by 69 publications

(37 citation statements)

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“…The aforementioned results show that Pt AC ‐MnO 2 has better performance than MnO 2 and Pt/C in alkaline medium, which may be mainly attributed to the strong interaction between Pt atomic clusters and MnO 2 , and the modulation of Mn electronic structure by Pt clusters. [ 40–42 ] Consideration of catalyst parameters, both the Tafel slope, overpotential, stability, Pt loading, and mass activity of Pt AC ‐MnO 2 in the alkaline medium are all superior to the recently reported noble metal‐based catalysts (Figure 3f and Table S3, Supporting Information). In addition, we also investigated the HER performance of Pt AC ‐MnO 2 in a neutral medium.…”

Section: Resultsmentioning

confidence: 76%

In Situ Confining Pt Clusters in Ultrathin MnO₂ Nanosheets for Highly Efficient Hydrogen Evolution Reaction

et al. 2021

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Rational synthesis of highly dispersed electrocatalyst with excellent electrocatalytic performance is critical for energy and environment applications. However, metal cluster with high surface free energy remains a challenge for the synthesis of stable and highly active catalysts. Herein, a highly dispersed platinum cluster anchored on the Mn vacancy of MnO2 nanosheets (PtAC‐MnO2) via in situ electrochemical methods is reported. The strongly binding energy between Pt clusters and supports can effectively suppress the migration of active Pt atoms and optimize their electronic structure for excellent electrocatalytic properties. Impressively, the PtAC‐MnO2 demonstrates a considerably low overpotential (η100) of 47 mV at 100 mA cm−2 and can be catalyzed continuously at 10 mA cm−2 for 80 h, showing better catalytic stability than the state‐of‐the‐art commercial Pt/C catalysts. A cationic vacancy defect strategy for the design and preparation of metal cluster catalysts is provided.

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Section: Resultsmentioning

confidence: 76%

In Situ Confining Pt Clusters in Ultrathin MnO₂ Nanosheets for Highly Efficient Hydrogen Evolution Reaction

et al. 2021

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“…Manganese oxide (MnO x ) is one of the most common transition metal oxides. The variable valence of Mn and the superior redox propertie have enabled MnO x as a promising candidate for efficient DOC catalyst (Kim et al, 2010;Gao et al, 2016;Xu et al, 2006;Shi et al, 2019;Miao et al, 2019;. Manganese oxides exist in many crystallines, which can be roughly divided into onedimensional tunnel structure, two-dimensional layered structure and three-dimensional spinel structure (Huang Z. et al, 2012;, manganese oxide with tunnel structure, also named as manganese oxide octahedral molecular sieve, has received extensive attention due to its superior catalytic performance (Makwana et al, 2002;Jarrige and Vervisch, 2009;Huang et al, 2017;Tang et al, 2010;Zhou et al, 2017;Uematsu et al, 2016;Wang et al, 2017;Tang et al, 2006;Chen et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Manganese Oxide Octahedral Molecular Sieves for CO and C3H6 Oxidation at Diesel Exhaust Conditions

Wang

Tan

Guo

et al. 2021

Front. Environ. Chem.

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Mn-based materials have been widely applied in the environmental catalysis field for their excellent redox properties. Here, three kinds of crystallite manganese oxides (pyrolusite, cryptomelane and todorokite) with different tunnel sizes (MnO(1 × 1), MnO(2 × 2), and MnO(3 × 3)) were prepared by hydrothermal method, and their catalytic performance in complete oxidation of diesel vehicle exhaust were tested. The highest catalytic oxidation activity was achieved on MnO(3 × 3) when compared with that on MnO(1 × 1) and MnO(2 × 2). Via a series of characterizations, such as transmission electron microscope, scanning electron microscope, X-ray powder diffraction, N2-sorption experiments, temperature-programmed reduction by H2/CO, and X-ray photoelectron spectroscopy, etc., it was found that the catalytic activity was mainly determined by the tunnel structure, specific surface area, and redox ability.

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“…Therefore, Zhang et al. [ 110 ] developed a new route for the synthesis of ultrathin MnO 2 . They developed a water swelling followed by a cetyltrimethylammonium bromide (CTAB) intercalation stripping method to prepare ultrathin MnO 2 with a thickness of 1–2 layers (Figure 6g–i).…”

Section: Modification Of Mno2 Single Species Nanomaterialsmentioning

confidence: 99%

“…On the other hand, the catalytic performance of MnO 2 is also closely related to its morphology. In recent studies, MnO 2 with various morphologies has been prepared for the degradation of formaldehyde, including nanowire, [ 137 ] 3D framework, [ 123,124 ] ultrathin nanosheets, [ 110 ] mesoporous hollow spheres, [ 97 ] hierarchical porous, [ 120 ] 3D ordered mesoporous, [ 115,116 ] etc.…”

Section: Environmental Applicationsmentioning

confidence: 99%

MnO₂‐Based Materials for Environmental Applications

et al. 2021

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Manganese dioxide (MnO2) is a promising photo–thermo–electric‐responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2‐based composites via the construction of homojunctions and MnO2/semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2‐based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high‐efficiency MnO2‐based materials for comprehensive environmental applications is provided.

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Ultrathin MnO2 nanosheets for optimized hydrogen evolution via formaldehyde reforming in water at room temperature

Cited by 69 publications

References 50 publications

In Situ Confining Pt Clusters in Ultrathin MnO₂ Nanosheets for Highly Efficient Hydrogen Evolution Reaction

In Situ Confining Pt Clusters in Ultrathin MnO₂ Nanosheets for Highly Efficient Hydrogen Evolution Reaction

Evaluation of Manganese Oxide Octahedral Molecular Sieves for CO and C3H6 Oxidation at Diesel Exhaust Conditions

MnO₂‐Based Materials for Environmental Applications

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Ultrathin MnO2 nanosheets for optimized hydrogen evolution via formaldehyde reforming in water at room temperature

Cited by 69 publications

References 50 publications

In Situ Confining Pt Clusters in Ultrathin MnO2 Nanosheets for Highly Efficient Hydrogen Evolution Reaction

In Situ Confining Pt Clusters in Ultrathin MnO2 Nanosheets for Highly Efficient Hydrogen Evolution Reaction

Evaluation of Manganese Oxide Octahedral Molecular Sieves for CO and C3H6 Oxidation at Diesel Exhaust Conditions

MnO2‐Based Materials for Environmental Applications

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In Situ Confining Pt Clusters in Ultrathin MnO₂ Nanosheets for Highly Efficient Hydrogen Evolution Reaction

In Situ Confining Pt Clusters in Ultrathin MnO₂ Nanosheets for Highly Efficient Hydrogen Evolution Reaction

MnO₂‐Based Materials for Environmental Applications