One-step synthesis of cobalt-doped MoS2 nanosheets as bifunctional electrocatalysts for overall water splitting under both acidic and alkaline conditions

2018 ◽  
Vol 54 (31) ◽  
pp. 3859-3862 ◽  
Author(s):  
Qizhong Xiong ◽  
Xian Zhang ◽  
Haojie Wang ◽  
Guoqiang Liu ◽  
Guozhong Wang ◽  
...  
Keyword(s):  
Free Energy ◽  
Electronic Structure ◽  
Water Splitting ◽  
Active Sites ◽  
Hydrogen Adsorption ◽  
Mos2 Nanosheets ◽  
Adsorption Free Energy ◽  
Alkaline Conditions ◽  
One Step ◽  
Catalytic Active Sites

Cobalt covalent doping in MoS2 effectively regulates its electronic structure to decrease the hydrogen adsorption free energy for high HER and simultaneously contributes additional catalytic active sites for the OER.

Computational screening of transition-metal single atom doped C9N4 monolayers as efficient electrocatalysts for water splitting

Nanoscale ◽  
2019 ◽  
Vol 11 (39) ◽  
pp. 18169-18175 ◽  
Author(s):  
Yanan Zhou ◽  
Guoping Gao ◽  
Jun Kang ◽  
Wei Chu ◽  
Lin-Wang Wang
Keyword(s):  
Free Energy ◽  
Transition Metal ◽  
Water Splitting ◽  
Gibbs Free Energy ◽  
Active Sites ◽  
Hydrogen Adsorption ◽  
Single Atom ◽  
Bifunctional Electrocatalyst ◽  
Computational Screening ◽  
Catalytic Active Sites

Ni@C9N4 performs as a promising bifunctional electrocatalyst with N and Ni atoms as the catalytic active sites for HER and OER, with calculated hydrogen adsorption Gibbs free energy (ΔGH*) of −0.04 eV and OER overpotential (ηOER) of 0.31 V.

A novel ligand with –NH2 and –COOH-decorated Co/Fe-based oxide for an efficient overall water splitting: dual modulation roles of active sites and local electronic structure

2020 ◽  
Vol 10 (18) ◽  
pp. 6266-6273
Author(s):  
Yalan Zhang ◽  
Zebin Yu ◽  
Ronghua Jiang ◽  
Jung Huang ◽  
Yanping Hou ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Water Splitting ◽  
Energy Demand ◽  
Active Sites ◽  
Electrode Materials ◽  
Global Energy ◽  
Overall Water Splitting ◽  
Local Electronic Structure ◽  
Electrochemical Water Splitting

Excellent electrochemical water splitting with remarkable durability can provide a solution to satisfy the increasing global energy demand in which the electrode materials play an important role.

scholarly journals Facile Synthesis of Uniform Mesoporous Nb2O5 Micro-Flowers for Enhancing Photodegradation of Methyl Orange

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3783
Author(s):  
Jian-Qing Qiu ◽  
Huan-Qing Xie ◽  
Ya-Hao Wang ◽  
Lan Yu ◽  
Fang-Yuan Wang ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Active Sites ◽  
High Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Flower Structure ◽  
Electron Microscopies ◽  
Bet Method ◽  
One Step ◽  
Catalytic Active Sites

The removal of organic pollutants using green environmental photocatalytic degradation techniques urgently need high-performance catalysts. In this work, a facile one-step hydrothermal technique has been successfully applied to synthesize a Nb2O5 photocatalyst with uniform micro-flower structure for the degradation of methyl orange (MO) under UV irradiation. These nanocatalysts are characterized by transmission and scanning electron microscopies (TEM and SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) method, and UV-Vis diffuse reflectance spectroscopy (DRS). It is found that the prepared Nb2O5 micro-flowers presents a good crystal phases and consist of 3D hierarchical nanosheets with 400–500 nm in diameter. The surface area is as large as 48.6 m2 g−1. Importantly, the Nb2O5 micro-flowers exhibit superior catalytic activity up to 99.9% for the photodegradation of MO within 20 mins, which is about 60-fold and 4-fold larger than that of without catalysts (W/O) and commercial TiO2 (P25) sample, respectively. This excellent performance may be attributed to 3D porous structure with abundant catalytic active sites.

(002) facets exposed and controllable thickness of CdS nanobelts drive desirable hydrogen-adsorption free energy (△GH) for boosting visible-light photocatalytic performance

2021 ◽  
Author(s):  
Dejian Yan ◽  
Zhiyong Xue ◽  
Feng Chen ◽  
Xia Liu ◽  
Zhenhua Yang ◽  
...  
Keyword(s):  
Free Energy ◽  
Visible Light ◽  
Environmental Pollution ◽  
Economically Disadvantaged ◽  
Photocatalytic Performance ◽  
Hydrogen Adsorption ◽  
Co Catalysts ◽  
Adsorption Free Energy ◽  
Cds Nanobelts ◽  
Visible Light Photocatalytic

In order to obtain the high photocatalytic performance, co-catalysts loading is the most commonly used, which is economically disadvantaged and environmental pollution. Here, we combine the strategy of controllable thickness...

scholarly journals One-Step Hydrothermal Synthesis of P25 @ Few Layered MoS2 Nanosheets toward Enhanced Bi-catalytic Activities: Photocatalysis and Electrocatalysis

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1636 ◽  
Author(s):  
Zhou ◽  
Zhang ◽  
Wang ◽  
Wang ◽  
Xu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Active Sites ◽  
Photocatalytic Performance ◽  
Transformation Efficiency ◽  
Hydrothermal Process ◽  
Mos2 Nanosheets ◽  
Sunlight Irradiation ◽  
Catalytic Activities ◽  
One Step ◽  
Layered Mos2

P25 loaded few layered molybdenum disulfide (MoS2) nanosheets (P25@MoS2) are successfully synthesized through a facile one-step hydrothermal process. The bi-catalytic activities, i.e., photocatalytic and electrocatalytic activities, of the as-prepared nanomaterials have been investigated. For the as-prepared products, the photocatalytic performances were investigated by degrading simulated pollutant under sunlight irradiation, and the hydrogen evolution reaction evaluated the electrocatalytic performances. The results indicate that P25@MoS2 possesses excellent activities in both photocatalysis and electrocatalysis. The presence of MoS2 broadens the light absorption range of P25 and improves the separation and transformation efficiency of photogenerated carriers, thus improving its photocatalytic performance. The existence of P25 inhibits the aggregation of MoS2 to form more dispersed MoS2 nanosheets with only few layers increasing its active sites. Thereby, the electrocatalytic performance is heightened. The excellent multifunction makes the as-prepared P25@MoS2 a promising material in the fields of environment and energy.

scholarly journals Transition-metal single atoms in nitrogen-doped graphenes as efficient active centers for water splitting: a theoretical study

2019 ◽  
Vol 21 (6) ◽  
pp. 3024-3032 ◽  
Author(s):  
Yanan Zhou ◽  
Guoping Gao ◽  
Yan Li ◽  
Wei Chu ◽  
Lin-Wang Wang
Keyword(s):  
Free Energy ◽  
Theoretical Study ◽  
Hydrogen Adsorption ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Active Centers ◽  
Nitrogen Doped ◽  
Single Atoms ◽  
Adsorption Free Energy ◽  
Excellent Catalytic Performance

A triple-coordinated Co exhibits high catalytic activity toward HER with a calculated hydrogen adsorption free energy of −0.01 eV, and a quadruple-coordinated Co shows excellent catalytic performance toward OER with a low computed overpotential of −0.39 V.

Tuning the coupling interface of ultrathin Ni3S2@NiV-LDH heterogeneous nanosheet electrocatalysts for improved overall water splitting

Nanoscale ◽  
2019 ◽  
Vol 11 (18) ◽  
pp. 8855-8863 ◽  
Author(s):  
Qianqian Liu ◽  
Jianfeng Huang ◽  
Yajuan Zhao ◽  
Liyun Cao ◽  
Kang Li ◽  
...  
Keyword(s):  
Water Splitting ◽  
Active Sites ◽  
Interface Engineering ◽  
Active Materials ◽  
Electronic Interactions ◽  
Overall Water Splitting ◽  
Catalytic Active Sites

Interface engineering is an effective approach to achieve abundant surface catalytic active sites and strong electronic interactions among active materials of heterostructured catalysts.

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