Titanium dioxide encapsulated carbon-nitride nanosheets derived from MXene and melamine-cyanuric acid composite as a multifunctional electrocatalyst for hydrogen and oxygen evolution reaction and oxygen reduction reaction

He, Linghao; Liu, Jiameng; Liu, Yongkang; Cui, Bingbing; Hu, Bin; Wang, Minghua; Tian, Kangkai; Song, Yingpan; Wu, Shao-Yi; Peng, Zhikun; Du, Miao

doi:10.1016/j.apcatb.2019.02.033

Cited by 204 publications

(68 citation statements)

References 55 publications

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“…The results clearly reveal that CN‐S(3:2) can facilitate the HER process and has higher electrocatalytic performance. The HER activity is comparable to other catalysts in 0.5 mol L −1 H 2 SO 4 as summarized in Table . Figure S5 shows the HER performance of all the samples obtained from precursors that were treated with different molar ratios of NaOH to melamine, CN‐S(3:2) exhibits higher HER activity than the others.…”

Section: Resultssupporting

confidence: 52%

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

Luo

Zhang

Han

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Sustainable production of oxygen and hydrogen via catalyst-aided water splitting utilizing solar energy has attracted increasing interest. The primary issue in this field is the development of earth-abundant and active photoelectrocatalytic materials. Herein, a novel hierarchical g-C 3 N 4 /g-C 3 N 4 metal-free homojunction catalyst is synthesized through partial hydrolysis of melamine in alkali and subsequent thermal treatment.RESULTS: The hierarchical g-C 3 N 4 /g-C 3 N 4 metal-free homojunction composed of lamellas features large exposed surface area, abundant interface contact and more channels for mass transfer, making it highly effective for water splitting with a small overpotential of 500 mV at 10 mA cm −2 and low Tafel slope of 93.1 mV dec −1 for oxygen evolution reaction (OER) in 1.0 mol L −1 potassium hydroxide (KOH) solution, as well as 259 mV at 10 mA cm −2 and 109.33 mV dec −1 for hydrogen evolution reaction (HER) in 0.5 mol L −1 sulfuric acid (H 2 SO 4 ) solution. Furthermore, the overpotential and Tafel slope further decrease to 383.4 mV and 69.52 mV dec −1 for OER, 150.1 mV and 67.93 mV dec −1 for HER upon visible light irradiation, demonstrating the exceptional photo-responsive catalytic performance, which can be attributed to the direct Z-scheme homojunction resulting in effective charge transfer and •OH and superoxide free radicals produced under visible light irradiation.CONCLUSION: This work provides a facile but effective approach for the construction of metal-free OER/HER bifunctional catalyst with high photo-responsive performance, achieving higher activity for catalyst-assisted water splitting.

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Section: Resultssupporting

confidence: 52%

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

Luo

Zhang

Han

et al. 2019

J of Chemical Tech & Biotech

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“…Through in situ hydrolysis and heat treatment, the 3D anatase TiO 2 nanoparticles can be decorated on Ti 3 C 2 MXene [35]. Based on these hydrothermal methods, the nanoparticle size of anatase TiO 2 is about 30 nm, and the TiO 2 is assembled on the surface of Ti 3 C 2 T X MXene nanosheets [36][37][38][39]. Then, Schottky junction can be formed at the interface of TiO 2 /MXene for promoting the carrier separation by hole trapping effect [33,34].…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Growing Anatase TiO2/SnO2 Multi-dimensional Heterojunctions at MXene Conductive Network for High-Efficient Perovskite Solar Cells

et al. 2020

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HIGHLIGHTS• Nanoscale multi-dimensional heterojunctions in situ grow at the edge of two-dimensional MXene conductive network.• A controlled anneal procedure in 150 °C is for preparing anatase TiO 2 /SnO 2 heterojunctions with oxygen vacancy scramble effect.• The perovskite solar cells achieve high power conversion efficiency and high moisture-resistance stability.ABSTRACT A multi-dimensional conductive heterojunction structure, composited by TiO 2 , SnO 2 , and Ti 3 C 2 T X MXene, is facilely designed and applied as electron transport layer in efficient and stable planar perovskite solar cells.Based on an oxygen vacancy scramble effect, the zero-dimensional anatase TiO 2 quantum dots, surrounding on two-dimensional conductive Ti 3 C 2 T X sheets, are in situ rooted on three-dimensional SnO 2 nanoparticles, constructing nanoscale TiO 2 /SnO 2 heterojunctions. The fabrication is implemented in a controlled lowtemperature anneal method in air and then in N 2 atmospheres. With the optimal MXene content, the optical property, the crystallinity of perovskite layer, and internal interfaces are all facilitated, contributing more amount of carrier with effective and rapid transferring in device. The champion power conversion efficiency of resultant perovskite solar cells achieves 19.14%, yet that of counterpart is just 16.83%. In addition, it can also maintain almost 85% of its initial performance for more than 45 days in 30-40% humidity air; comparatively, the counterpart declines to just below 75% of its initial performance.

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“…A skinny layer with an approximate thickness of 100 nm was put at liquid nitrogen under refrigeration conditions and was cut using EM UC/FC6ULTRAMICROTOME Tool (lecia) equipped https://doi.org/10.37358/MP.20.3.5397 with a diamond knife. Then TEM images were obtained using a Transmission electron microscope KEV 80 of EM 900 model made by Ziess Co. at accelerating voltage of 80 KV [35][36][37][38][39][40][41].…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

Morphology and Mechanical Properties of Polyethylene Terephthalate/Ethylene Propylene Diene Monomer (PET/EPDM) in the Presence of Nanoclay

Liu¹,

Mirjalili²,

Valipour³

et al. 2020

Mater. Plast.

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This research deals with the mechanical properties, microstructure, and interrelations of triple nanocomposite based on PET/EPDM/Nanoclay. These properties were examined in different percentages of PET/EPDM blend with compatibilizer (Styrene-Ethylene/Butylene-Styrene)-G-(Maleic anhydrate) (SEBS-g-MAH). Results showed that the addition of 15% SEBS-g-MAH improved the toughness and impact strength of this nanocomposite. SEM micrographs indicated the most stable fuzzy microstructure in a 50/50 mixture of scattered phases of EPDM/SEBS-g-MAH. The effects of percentages of 1, 3, 5, 7 nanoclay Cloisite 30B (C30B) on the improvement of the properties were evaluated. With the addition of nano clay, the toughness and impact strength was reduced. Thermal destruction of nanoclay in processing temperature led to the decreasing dispersion of clay plates in the matrix and a reduction in the distances of nano clay plates in the composite compared to pure nano clay. XRD and TEM analysis was used to demonstrate the results. By adding 1% of nanoclay to the optimal sample, maximum stiffness, and Impact strength, among other nanocomposites, was achieved.

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Titanium dioxide encapsulated carbon-nitride nanosheets derived from MXene and melamine-cyanuric acid composite as a multifunctional electrocatalyst for hydrogen and oxygen evolution reaction and oxygen reduction reaction

Cited by 204 publications

References 55 publications

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

Low-Temperature Growing Anatase TiO2/SnO2 Multi-dimensional Heterojunctions at MXene Conductive Network for High-Efficient Perovskite Solar Cells

Morphology and Mechanical Properties of Polyethylene Terephthalate/Ethylene Propylene Diene Monomer (PET/EPDM) in the Presence of Nanoclay

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