Etching-induced highly porous polymeric carbon nitride with enhanced photocatalytic hydrogen evolution

2021 ◽  
Author(s):  
Xiang Wang ◽  
Yuguo Xia ◽  
Haimei Wang ◽  
Xiuling Jiao ◽  
Dairong Chen
Keyword(s):  
Specific Surface ◽  
Surface Charge ◽  
Surface Area ◽  
Charge Separation ◽  
Active Sites ◽  
Carbon Nitride ◽  
Separation Process ◽  
Large Specific Surface Area ◽  
Polymeric Carbon ◽  
Highly Porous

Photocatalytic catalysts with a large specific surface area generally can not only supply more active sites but also facilitate the surface charge separation process. Here, we present a facile strategy...

Three-dimensional graphene encapsulated hollow CoSe2-SnSe2 nanoboxes for high performance asymmetric supercapacitors

2022 ◽  
Author(s):  
Kainan Li ◽  
Ke Zheng ◽  
Zhifang Zhang ◽  
Kuan Li ◽  
Ziyao Bian ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Sites ◽  
Specific Capacity ◽  
Three Dimensional ◽  
Hollow Structure ◽  
Large Specific Surface Area ◽  
Composite Aerogel

Abstract Construction of metal selenides with a large specific surface area and a hollow structure is one of the effective methods to improve the electrochemical performance of supercapacitors. However, the nano-material easily agglomerates due to the lack of support, resulting in the loss of electrochemical performance. Herein, we successfully design a three-dimensional graphene (3DG) encapsulation-protected hollow nanoboxes (CoSe2-SnSe2) composite aerogel (3DG/CoSe2-SnSe2) via a co-precipitation method coupled with self-assembly route, followed by a high temperature selenidation strategy. The obtained aerogel possesses porous 3DG conductive network, large specific surface area and plenty of reactive active sites. It could be used as a flexible and binder-free electrode after a facile mechanical compression process, which provided a high specific capacitance of 460 F g-1 at 0.5 A g-1, good rate capability of 212.7 F g-1 at 10 A g-1, and excellent cycle stability due to the fast electron/ion transfer and electrolyte diffusion. With the as-prepared 3DG/CoSe2-SnSe2 as positive electrodes and the AC (activated carbon) as negative electrodes, an asymmetric supercapacitor (3DG/CoSe2-SnSe2//AC) was fabricated, which delivered a high specific capacity of 38 F g-1 at 1A g-1 and an energy density of 11.89 W h kg-1 at 749.9 W kg-1, as well as a capacitance retention of 91.1% after 3000 cycles. This work provides a new method for preparing electrode material.

Preparation of Nitrogen-Deficient Graphitic Carbon Nitride with a Large Specific Surface Area by Melt Pretreatment and Its Photocatalytic Performance

NANO ◽  
2020 ◽  
Vol 15 (06) ◽  
pp. 2050079
Author(s):  
Xuelei Li ◽  
Jinfeng Bai ◽  
Jiaqi Li ◽  
Chao Li ◽  
Junru Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Nitride ◽  
Mesoporous Structure ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Large Specific Surface Area ◽  
X Ray

In this study, nitrogen-deficient graphitic carbon nitride (M-LS-g-C3N4) with a mesoporous structure and a large specific surface area was obtained by calcination after melt pretreatment using urea as a precursor. X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption, X-ray photoelectron spectroscopy (XPS), UV-Vis, ESR and photoluminescence (PL) were used to characterize the structure, morphology and optical performance of the samples. The TEM results showed the formation of a mesoporous structure on the 0.1[Formula: see text]M-LS-g-C3N4 surface. The porous structure led to an increase in the specific surface area from 41.5[Formula: see text]m2/g to 124.3[Formula: see text]m2/g. The UV-Vis results showed that nitrogen vacancies generated during the modification process reduced the band gap of g-C3N4 and improved the visible light absorption. The PL spectra showed that the nitrogen defects promoted the separation of photogenerated electron–hole pairs. In the visible light degradation of methyl orange (MO), the reaction rate constant of 0.1[Formula: see text]M-LS-g-C3N4 reached 0.0086[Formula: see text][Formula: see text], which was 5.05 times that of pure g-C3N4. Superoxide radicals and photogenerated holes were found to be the main active species in the reaction system. This study provides an efficient, green and convenient means of preparing graphitic carbon nitride with a large specific surface area.

Polyhedral oligomeric silsesquioxane as a recyclable soft template to synthesize mesoporous polymeric carbon nitride with enhanced photocatalytic hydrogen evolution

2021 ◽  
Vol 5 (1) ◽  
pp. 112-116
Author(s):  
Zhiwei Liang ◽  
Lei Liu ◽  
Xiaojia Zhuang ◽  
Zicheng Tang ◽  
Haiping Li ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Hydrogen Evolution ◽  
Specific Surface Area ◽  
Carbon Nitride ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Soft Template ◽  
Photocatalytic Hydrogen Evolution ◽  
Oligomeric Silsesquioxane ◽  
Polymeric Carbon

A novel recyclable template was used to prepare mesoporous polymeric carbon nitride with prominently increased specific surface area and photoactivity.

scholarly journals Hydrothermal Synthesis of 1T-MoS2/Pelagic Clay Composite and Its Application in the Catalytic Reduction of 4-Nitrophenol

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7020
Author(s):  
Nan Li ◽  
Qiwei Sun ◽  
Peiping Zhang ◽  
Shubo Jing
Keyword(s):  
Hydrothermal Synthesis ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Sites ◽  
Fine Particles ◽  
Catalytic Reduction ◽  
Large Specific Surface Area ◽  
Mos2 Nanosheets ◽  
Pelagic Clay

Pelagic clay is an emerging marine resource with strong hydrophilicity, fine particles and a large specific surface area. In this work, a 1T-MoS2/pelagic clay composite was fabricated by hydrothermal synthesis. In the composite, 1T-MoS2 nanosheets are evenly dispersed on the surface of the clay minerals, significantly reducing the agglomeration of MoS2. Compared with pure 1T-MoS2, the 1T-MoS2 nanosheets generated on the surface of pelagic clay have significantly smaller lateral dimensions and thicknesses. Moreover, the specific surface area is much larger than that of the pure 1T-MoS2 nanosheets fabricated by the same method, indicating that the active sites of the MoS2 sheets are fully exposed. In addition, the composite exhibited excellent hydrophilicity, leading to a high dispersibility in aqueous solutions. In this work, the composite was used as a catalyst in the reduction of 4-nitrophenol (4-NP), and the conversion of 4-NP reached up to 96.7%. This result shows that the 1T-MoS2/pelagic clay composite is a promising catalyst in a variety of reactions.

scholarly journals High Level Oxygen Reduction Catalysts Derived from the Compounds of Large Specific Surface Area Pine Peel Activated Carbon and Phthalocyanine Cobalt

2021 ◽  
Author(s):  
Lei Zhao ◽  
Ziwei Lan ◽  
Junyu Su ◽  
Huazhu Liang ◽  
Jiayu Yao ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Sites ◽  
High Performance ◽  
Metal Catalysts ◽  
Large Specific Surface Area ◽  
Composite Catalysts ◽  
Nonprecious Metal

Compared with precious metal catalysts, non-platinum catalysts have the advantages of low cost and high performance. Among them, the activated carbon (AC) with a large specific surface area (SSA) can be used as a carrier or as a carbon source of nonprecious metal/carbon system catalyst at the same time. Therefore, this paper uses cheap pine peel bio-based materials to prepare large surface area activated carbon and then compound with cobalt phthalocyanine (CoPc) to obtain a high-performance cobalt/nitrogen/carbon catalyst. The merits include AC@CoPc composite catalysts are prepared by precisely controlling the composite proportion of AC and CoPc, the atomically dispersed Co nanoparticles form and synergistically with N promote the exposure of CoNx active sites, and the Eonset of the catalyst treated with a composite proportion of AC and CoPc of 1 to 2 at 800 °C (AC@CoPc-800-1-2) is 1.01 V, which is higher than Pt/C (20 wt%) catalyst. Apart from this, the stability is 87.8% in 0.1 M KOH after 20000 s testing in compared with other AC@CoPc series catalysts and Pt/C (20 wt%) catalyst. Considering from the performance and price of the catalyst in practical application, these composite catalysts combine biomass carbon materials with phthalocyanine series, which will be widely used in the area of nonprecious metal catalysts.

Facile synthesis of highly porous N-doped CNTs/Fe3C and its electrochemical properties

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44013-44018 ◽  
Author(s):  
Yanzhong Wang ◽  
Guoxiang Zhang ◽  
Guiwu Liu ◽  
Wei Liu ◽  
Huiyu Chen ◽  
...  
Keyword(s):  
Specific Surface ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Capacitance ◽  
Large Specific Surface Area ◽  
Facile Synthesis ◽  
Highly Porous

Porous N-doped CNTs/Fe3C was synthesized by a facile method. N-doped CNTs/Fe3C possesses the large specific surface area up to 1021.26 m2g−1. It exhibits a high specific capacitance of 181 F g−1at 0.1 A g−1and excellent capacitance rate.

scholarly journals Synthesis of oxygen-doped graphitic carbon nitride and its application for the degradation of organic pollutants via dark Fenton-like reactions

RSC Advances ◽  
2020 ◽  
Vol 10 (54) ◽  
pp. 32906-32918 ◽  
Author(s):  
Tian-Jiao Jiang ◽  
Cai-Wu Luo ◽  
Chao Xie ◽  
Yue-Hua Wei ◽  
An Li
Keyword(s):  
Specific Surface ◽  
Environmental Protection ◽  
Surface Area ◽  
Organic Pollutants ◽  
Specific Surface Area ◽  
Active Sites ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride

Graphitic carbon nitride (g-C3N4) is a promising photocatalyst for environmental protection but its development is greatly limited for its application in dark Fenton-like reactions due to its extremely low specific surface area and lack of suitable active sites.

scholarly journals Highly porous nitrogen-doped carbon for superior electric double-layer capacitors

RSC Advances ◽  
2017 ◽  
Vol 7 (71) ◽  
pp. 44735-44742 ◽  
Author(s):  
Da Sol Jeong ◽  
Je Moon Yun ◽  
Kwang-Ho Kim
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Carbon Material ◽  
Electric Double Layer ◽  
Large Specific Surface Area ◽  
Supercapacitive Performance ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Double Layer Capacitors ◽  
Highly Porous

The highly porous nitrogen-doped carbon material pyrolyzed from one of PVP/NaOH mixtures with different NaOH contents exhibited a large specific surface area of up to 2400 m2 g−1 and an excellent supercapacitive performance of maximum 478 F g−1.

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