α-MoC1–x Quantum Dots Encapsulated in Nitrogen-Doped Carbon for Hydrogen Evolution Reaction at All pH Values

2019 ◽  
Vol 7 (10) ◽  
pp. 9637-9645 ◽  
Author(s):  
Liu Lin ◽  
Zemin Sun ◽  
Mengwei Yuan ◽  
Han Yang ◽  
Huifeng Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Nitrogen Doped ◽  
Ph Values ◽  
Nitrogen Doped Carbon

scholarly journals Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 466
Author(s):  
Kaixin Chang ◽  
Qianjin Zhu ◽  
Liyan Qi ◽  
Mingwei Guo ◽  
Woming Gao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Lactic Acid ◽  
Fluorescence Quenching ◽  
Functional Groups ◽  
Fluorescence Intensity ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
Ph Values ◽  
Wide Range ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon quantum dots (N-CQDs) were synthesized in a one-step hydrothermal technique utilizing L-lactic acid as that of the source of carbon and ethylenediamine as that of the source of nitrogen, and were characterized using dynamic light scattering, X-ray photoelectron spectroscopy ultraviolet-visible spectrum, Fourier-transformed infrared spectrum, high-resolution transmission electron microscopy, and fluorescence spectrum. The generated N-CQDs have a spherical structure and overall diameters ranging from 1–4 nm, and their surface comprises specific functional groups such as amino, carboxyl, and hydroxyl, resulting in greater water solubility and fluorescence. The quantum yield of N-CQDs (being 46%) is significantly higher than that of the CQDs synthesized from other biomass in literatures. Its fluorescence intensity is dependent on the excitation wavelength, and N-CQDs release blue light at 365 nm under ultraviolet light. The pH values may impact the protonation of N-CQDs surface functional groups and lead to significant fluorescence quenching of N-CQDs. Therefore, the fluorescence intensity of N-CQDs is the highest at pH 7.0, but it decreases with pH as pH values being either more than or less than pH 7.0. The N-CQDs exhibit high sensitivity to Fe3+ ions, for Fe3+ ions would decrease the fluorescence intensity of N-CQDs by 99.6%, and the influence of Fe3+ ions on N-CQDs fluorescence quenching is slightly affected by other metal ions. Moreover, the fluorescence quenching efficiency of Fe3+ ions displays an obvious linear relationship to Fe3+ concentrations in a wide range of concentrations (up to 200 µM) and with a detection limit of 1.89 µM. Therefore, the generated N-CQDs may be utilized as a robust fluorescence sensor for detecting pH and Fe3+ ions.

Ultrafine molybdenum carbide nanoparticles supported on nitrogen doped carbon nanosheets for hydrogen evolution reaction

2019 ◽  
Vol 30 (1) ◽  
pp. 192-196 ◽  
Author(s):  
Kedong Xia ◽  
Junpo Guo ◽  
Cuijuan Xuan ◽  
Ting Huang ◽  
Zhiping Deng ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Molybdenum Carbide ◽  
Carbon Nanosheets ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Low-ruthenium-content NiRu nanoalloys encapsulated in nitrogen-doped carbon as highly efficient and pH-universal electrocatalysts for the hydrogen evolution reaction

2018 ◽  
Vol 6 (4) ◽  
pp. 1376-1381 ◽  
Author(s):  
You Xu ◽  
Shuli Yin ◽  
Chunjie Li ◽  
Kai Deng ◽  
Hairong Xue ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Efficient Catalyst ◽  
Nitrogen Doped ◽  
Highly Efficient ◽  
Wide Ph Range ◽  
Ph Range ◽  
Nitrogen Doped Carbon

A NiRu@N–C hybrid is fabricated and tested as an efficient catalyst for the hydrogen evolution reaction in a wide pH range.

Mo2C quantum dot embedded chitosan-derived nitrogen-doped carbon for efficient hydrogen evolution in a broad pH range

2016 ◽  
Vol 52 (86) ◽  
pp. 12753-12756 ◽  
Author(s):  
Zonghua Pu ◽  
Min Wang ◽  
Zongkui Kou ◽  
Ibrahim Saana Amiinu ◽  
Shichun Mu
Keyword(s):  
Catalytic Activity ◽  
Quantum Dot ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
High Catalytic Activity ◽  
Nitrogen Doped ◽  
Ph Range ◽  
Nitrogen Doped Carbon

Mo2C QDs/NGCLs exhibit high catalytic activity and durability for the hydrogen evolution reaction in a broad pH range.

Tungsten nitride/carbide nanocomposite encapsulated in nitrogen-doped carbon shell as an effective and durable catalyst for hydrogen evolution reaction

2018 ◽  
Vol 42 (24) ◽  
pp. 19557-19563 ◽  
Author(s):  
Shihao Xu ◽  
Suyun Chu ◽  
Liang Yang ◽  
Yao Chen ◽  
Zhenyang Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Carbon Shell ◽  
Hybrid Nanoparticles ◽  
Tungsten Nitride ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

In situ carbonized WOX/aniline hybrid nanoparticles were prepared and used to obtain WN–W2C nanocomposites encapsulated in nitrogen-doped carbon shell, which demonstrated excellent HER performance.

Ultrasmall MoP encapsulated in nitrogen-doped carbon hybrid frameworks for highly efficient hydrogen evolution reaction in both acid and alkaline solutions

2019 ◽  
Vol 6 (6) ◽  
pp. 1482-1489 ◽  
Author(s):  
Xiaokang Huang ◽  
Xiang Wang ◽  
Pengbo Jiang ◽  
Kai Lan ◽  
Jiaheng Qin ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Alkaline Solutions ◽  
Nitrogen Doped ◽  
Highly Efficient ◽  
Nitrogen Doped Carbon

Ultrasmall MoP encapsulated in N-doped carbon shows outstanding HER activities in both acid and alkaline solutions.

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