Porous MoO<sub>2</sub> Nanosheets as Non‐noble Bifunctional Electrocatalysts for Overall Water Splitting

Jin, Yanshuo; Wang, Haotian; Li, Junjie; Yue, Xin; Han, Yujie; Shen, Pei Kang; Cui, Yi

doi:10.1002/adma.201506314

Cited by 749 publications

(487 citation statements)

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“…As shown in Supplementary Fig. 2, main eight Raman scattering peaks at 200, 226, 345, 351, 456, 492, 569 and 739 cm −1 are detected30. The characteristic peaks at 569 and 739 cm −1 can be indexed to the O–Mo bond vibration modes of MoO 2 , while the other fingerprint peaks at 200, 226, 345, 351, 456 and 492 cm −1 can be attributed to the phonon vibration modes of MoO 2 .…”

Section: Resultsmentioning

confidence: 87%

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A metallic molybdenum dioxide with high stability for surface enhanced Raman spectroscopy

et al. 2017

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Compared with noble metals, semiconductors with surface plasmon resonance effect are another type of SERS substrate materials. The main obstacles so far are that the semiconducting materials are often unstable and easy to be further oxidized or decomposed by laser irradiating or contacting with corrosive substances. Here, we report that metallic MoO2 can be used as a SERS substrate to detect trace amounts of highly risk chemicals including bisphenol A (BPA), dichloropheno (DCP), pentachlorophenol (PCP) and so on. The minimum detectable concentration was 10−7 M and the maximum enhancement factor is up to 3.75 × 106. To the best of our knowledge, it may be the best among the metal oxides and even reaches or approaches to Au/Ag. The MoO2 shows an unexpected high oxidation resistance, which can even withstand 300 °C in air without further oxidation. The MoO2 material also can resist long etching of strong acid and alkali.

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Section: Resultsmentioning

confidence: 87%

“…As a common metal oxide, MoO 2 nanostructures are often used in the preparation of lithium ion batteries and electrocatalysts27282930, but they are rarely reported for other uses. Compared with semiconducting MoO 3 , MoO 2 has many vastly different characteristics, such as high conductivity, high melting point, high chemical stability and so on31.…”

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confidence: 99%

A metallic molybdenum dioxide with high stability for surface enhanced Raman spectroscopy

et al. 2017

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“…Therefore, low‐cost, highly efficient, and stable long‐term electrocatalysts for water splitting are needed. Currently, transition‐metal (Fe, Co, Ni, Mn, and Mo)‐based catalysts including metal oxides,23, 24, 25, 26, 27, 28, 29, 30 hydroxides,31, 32, 33, 34, 35 phosphides,36, 37, 38, 39, 40, 41, 42 sulfides,43, 44, 45, 46, 47, 48 selenides,49, 50, 51, 52, 53, 54 and nitrides55, 56, 57, 58, 59, 60, 61, 62 have been highlighted as the most promising candidates of OER and HER electrocatalysts. Especially, layered double hydroxides (LDHs)63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85 and their derivatives (metal hydroxides, oxyhydroxides, oxides, bimetal nitrides, phosphides, sulfides, and selenides)86, 87, 88, 89, 9...…”

Section: Introductionmentioning

confidence: 99%

Recent Progress on Layered Double Hydroxides and Their Derivatives for Electrocatalytic Water Splitting

et al. 2018

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Layered double hydroxide (LDH)‐based materials have attracted widespread attention in various applications due to their unique layered structure with high specific surface area and unique electron distribution, resulting in a good electrocatalytic performance. Moreover, the existence of multiple metal cations invests a flexible tunability in the host layers; the unique intercalation characteristics lead to flexible ion exchange and exfoliation. Thus, their electrocatalytic performance can be tuned by regulating the morphology, composition, intercalation ion, and exfoliation. However, the poor conductivity limits their electrocatalytic performance, which therefore has motivated researchers to combine them with conductive materials to improve their electrocatalytic performance. Another factor hampering their electrocatalytic activity is their large lateral size and the bulk thickness of LDHs. Introducing defects and tuning electronic structure in LDH‐based materials are considered to be effective strategies to increase the number of active sites and enhance their intrinsic activity. Given the unique advantages of LDH‐based materials, their derivatives have been also used as advanced electrocatalysts for water splitting. Here, recent progress on LDHs and their derivatives as advanced electrocatalysts for water splitting is summarized, current strategies for their designing are proposed, and significant challenges and perspectives of LDHs are discussed.

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“…In this regard, most efforts have been devoted to developing low‐cost and earth‐abundant alternatives for large‐scale hydrogen production in past decades 11, 12, 13. A variety of earth‐abundant materials including transition metal chalcogenides,14, 15, 16, 17, 18 phosphides,19, 20, 21, 22 carbides,23, 24 metal oxides,25 and metals or their alloys26, 27, 28, 29 have been identified as potential candidates. However, a large part of these electrocatalysts only exhibit noticeable activities and stabilities in acidic electrolytes but suffer from either low activity or instability in alkaline media 30, 31, 32.…”

Section: Introductionmentioning

confidence: 99%

Nickel Hydr(oxy)oxide Nanoparticles on Metallic MoS₂ Nanosheets: A Synergistic Electrocatalyst for Hydrogen Evolution Reaction

2017

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Molybdenum disulfide (MoS2)‐based materials have been recently identified as promising electrocatalysts for hydrogen evolution reaction (HER). However, little work has been done to improve the catalytic performance of MoS2 toward HER in alkaline electrolytes, which is more suitable for water splitting in large‐scale applications. Here, it is reported that the hybridization of 0D nickel hydr(oxy)oxide nanoparticles with 2D metallic MoS2 nanosheets can significantly enhance the HER activities in alkaline and neutral electrolytes. Impressively, the optimized hybrid catalyst can drive a cathodic current density of 10 mA cm−2 at an overpotential of ≈73 mV for HER in 1 m KOH, about 185 mV smaller than the original MoS2. The improved HER activity is attributed to a bifunctional mechanism adopted in these hybrid catalysts, in which nickel hydr(oxy)oxide promotes the water adsorption and dissociation to supply protons for subsequent reactions occurred on MoS2 to generate H2.

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Porous MoO₂ Nanosheets as Non‐noble Bifunctional Electrocatalysts for Overall Water Splitting

Abstract: A porous MoO2 nanosheet as an active and stable bifunctional electrocatalyst for overall water splitting, is presented. It needs a cell voltage of only about 1.53 V to achieve a current density of 10 mA cm(-2) and maintains its activity for at least 24 h in a two-electrode configuration.

Cited by 749 publications

References 48 publications

A metallic molybdenum dioxide with high stability for surface enhanced Raman spectroscopy

A metallic molybdenum dioxide with high stability for surface enhanced Raman spectroscopy

Recent Progress on Layered Double Hydroxides and Their Derivatives for Electrocatalytic Water Splitting

Nickel Hydr(oxy)oxide Nanoparticles on Metallic MoS₂ Nanosheets: A Synergistic Electrocatalyst for Hydrogen Evolution Reaction

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Porous MoO2 Nanosheets as Non‐noble Bifunctional Electrocatalysts for Overall Water Splitting

Abstract: A porous MoO2 nanosheet as an active and stable bifunctional electrocatalyst for overall water splitting, is presented. It needs a cell voltage of only about 1.53 V to achieve a current density of 10 mA cm(-2) and maintains its activity for at least 24 h in a two-electrode configuration.

Cited by 749 publications

References 48 publications

A metallic molybdenum dioxide with high stability for surface enhanced Raman spectroscopy

A metallic molybdenum dioxide with high stability for surface enhanced Raman spectroscopy

Recent Progress on Layered Double Hydroxides and Their Derivatives for Electrocatalytic Water Splitting

Nickel Hydr(oxy)oxide Nanoparticles on Metallic MoS2 Nanosheets: A Synergistic Electrocatalyst for Hydrogen Evolution Reaction

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Product

Resources

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Porous MoO₂ Nanosheets as Non‐noble Bifunctional Electrocatalysts for Overall Water Splitting

Nickel Hydr(oxy)oxide Nanoparticles on Metallic MoS₂ Nanosheets: A Synergistic Electrocatalyst for Hydrogen Evolution Reaction