Metal Sulfide Photocatalysts for Hydrogen Generation by Water Splitting Under Illumination of Solar Light

2014 ◽  
pp. 165-187
Author(s):  
Zhonghai Zhang
Keyword(s):  
Water Splitting ◽  
Hydrogen Generation ◽  
Metal Sulfide ◽  
Solar Light

scholarly journals High-Index-Faceted Ni3S2 Branch Arrays as Bifunctional Electrocatalysts for Efficient Water Splitting

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Shengjue Deng ◽  
Kaili Zhang ◽  
Dong Xie ◽  
Yan Zhang ◽  
Yongqi Zhang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Active Sites ◽  
Large Scale ◽  
High Efficiency ◽  
Hydrogen Generation ◽  
Metal Sulfide ◽  
Value Added ◽  
Active Surface ◽  
High Index ◽  
Active Surface Area

Abstract For efficient electrolysis of water for hydrogen generation or other value-added chemicals, it is highly relevant to develop low-temperature synthesis of low-cost and high-efficiency metal sulfide electrocatalysts on a large scale. Herein, we construct a new core–branch array and binder-free electrode by growing Ni3S2 nanoflake branches on an atomic-layer-deposited (ALD) TiO2 skeleton. Through induced growth on the ALD-TiO2 backbone, cross-linked Ni3S2 nanoflake branches with exposed {$$\bar{2}10$$ 2 ¯ 10 } high-index facets are uniformly anchored to the preformed TiO2 core forming an integrated electrocatalyst. Such a core–branch array structure possesses large active surface area, uniform porous structure, and rich active sites of the exposed {$$\bar{2}10$$ 2 ¯ 10 } high-index facet in the Ni3S2 nanoflake. Accordingly, the TiO2@Ni3S2 core/branch arrays exhibit remarkable electrocatalytic activities in an alkaline medium, with lower overpotentials for both oxygen evolution reaction (220 mV at 10 mA cm−2) and hydrogen evolution reaction (112 mV at 10 mA cm−2), which are better than those of other Ni3S2 counterparts. Stable overall water splitting based on this bifunctional electrolyzer is also demonstrated.

scholarly journals Simultaneously Efficient Solar Light Harvesting and Charge Transfer of Hollow Octahedral Cu2S/CdS p–n Heterostructures for Remarkable Photocatalytic Hydrogen Generation

2021 ◽  
Author(s):  
Yanting Zhang ◽  
Lei Ran ◽  
Zhuwei Li ◽  
Panlong Zhai ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Rational Design ◽  
Hydrogen Generation ◽  
Three Dimensional ◽  
Band Alignment ◽  
Solar Light ◽  
Internal Electric Field ◽  
Multiple Reflections ◽  
One Pot ◽  
Promising Alternative

AbstractSolar-driven water splitting is a promising alternative to industrial hydrogen production. This study reports an elaborate design and synthesis of the integration of cadmium sulfide (CdS) quantum dots and cuprous sulfide (Cu2S) nanosheets as three-dimensional (3D) hollow octahedral Cu2S/CdS p–n heterostructured architectures by a versatile template and one-pot sulfidation strategy. 3D hierarchical hollow nanostructures can strengthen multiple reflections of solar light and provide a large specific surface area and abundant reaction sites for photocatalytic water splitting. Owing to the construction of the p–n heterostructure as an ideal catalytic model with highly matched band alignment at Cu2S/CdS interfaces, the emerging internal electric field can facilitate the space separation and transfer of photoexcited charges between CdS and Cu2S and also enhance charge dynamics and prolong charge lifetimes. Notably, the unique hollow Cu2S/CdS architectures deliver a largely enhanced visible-light-driven hydrogen generation rate of 4.76 mmol/(g·h), which is nearly 8.5 and 476 times larger than that of pristine CdS and Cu2S catalysts, respectively. This work not only paves the way for the rational design and fabrication of hollow photocatalysts but also clarifies the crucial role of unique heterostructure in photocatalysis for solar energy conversion.

Nonlayered Tin Thiohypodiphosphate Nanosheets: Controllable Growth and Solar-Light-Driven Water Splitting

2021 ◽  
Author(s):  
Marshet G. Sendeku ◽  
Fengmei Wang ◽  
Zhongzhou Cheng ◽  
Peng Yu ◽  
Ning Gao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Solar Light ◽  
Controllable Growth

Photocatalytic CO2 reduction using water as an electron donor by a powdered Z-scheme system consisting of metal sulfide and an RGO–TiO2 composite

2017 ◽  
Vol 198 ◽  
pp. 397-407 ◽  
Author(s):  
Tomoaki Takayama ◽  
Ko Sato ◽  
Takehiro Fujimura ◽  
Yuki Kojima ◽  
Akihide Iwase ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Visible Light ◽  
Water Splitting ◽  
Electron Donor ◽  
Visible Light Irradiation ◽  
Co2 Reduction ◽  
Metal Sulfide ◽  
Electron Donors ◽  
Reduced Graphene

CuGaS2, (AgInS2)x–(ZnS)2−2x, Ag2ZnGeS4, Ni- or Pb-doped ZnS, (ZnS)0.9–(CuCl)0.1, and ZnGa0.5In1.5S4 showed activities for CO2 reduction to form CO and/or HCOOH in an aqueous solution containing K2SO3 and Na2S as electron donors under visible light irradiation. Among them, CuGaS2 and Ni-doped ZnS photocatalysts showed relatively high activities for CO and HCOOH formation, respectively. CuGaS2 was applied in a powdered Z-scheme system combining with reduced graphene oxide (RGO)-incorporated TiO2 as an O2-evolving photocatalyst. The powdered Z-scheme system produced CO from CO2 in addition to H2 and O2 due to water splitting. Oxygen evolution with an almost stoichiometric amount indicates that water was consumed as an electron donor in the Z-schematic CO2 reduction. Thus, we successfully demonstrated CO2 reduction of artificial photosynthesis using a simple Z-scheme system in which two kinds of photocatalyst powders (CuGaS2 and an RGO–TiO2 composite) were only dispersed in water under 1 atm of CO2.

scholarly journals Solar Hydrogen Generation from Water Splitting Using ZnO/CuO Hetero Nanostructures

2014 ◽  
Vol 61 ◽  
pp. 345-348 ◽  
Author(s):  
Qiaobao Zhang ◽  
Daguo Xu ◽  
Xiang Zhou ◽  
Kaili Zhang
Keyword(s):  
Water Splitting ◽  
Hydrogen Generation ◽  
Solar Hydrogen

Increased crystallinity of RuSe2/Carbon Nanotubes for enhanced electrochemical hydrogen generation performance

Nanoscale ◽  
2021 ◽  
Author(s):  
Dongze Li ◽  
Meng Zha ◽  
Ligang Feng ◽  
Guangzhi Hu ◽  
Chaoquan Hu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Electrochemical Water Splitting

Ru-based catalyst is significant in the green hydrogen generation via electrochemical water-splitting reaction. Herein, it is found that the increased crystallinity of cubic RuSe2 nanoparticles anchored over carbon nanotubes (RuSe2/CNTs)...

Assembling γ-graphyne surrounding TiO2 nanotube arrays: An efficient p-n heterojunction for boosting photoelectrochemical water splitting

2021 ◽  
Author(s):  
Dong Qiu ◽  
Chengli He ◽  
Yuxuan Lu ◽  
Qiaodan Li ◽  
Yang Chen ◽  
...  
Keyword(s):  
Water Splitting ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Electron Injection ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Photoelectrochemical Water Splitting ◽  
Nanotube Arrays ◽  
Injection Efficiency ◽  
Electron Injection Efficiency

Photoelectrochemical water splitting is an excellent strategy for hydrogen generation, and it is pivotal to develop photoanodes with proficient sunlight harvesting, rapid charge separation, and enhanced electron injection efficiency. In...

scholarly journals Thickness-dependent photoelectrochemical properties of a semitransparent Co3O4 photocathode

2018 ◽  
Vol 9 ◽  
pp. 2432-2442 ◽  
Author(s):  
Malkeshkumar Patel ◽  
Joondong Kim
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Hydrogen Generation ◽  
Hydrogen Gas ◽  
Generation Rate ◽  
Alkaline Electrolyte ◽  
Stoichiometric Ratio ◽  
Gas Generation ◽  
Pec Cells ◽  
Gas Generation Rate

Co3O4 has been widely studied as a catalyst when coupled with a photoactive material during hydrogen production using water splitting. Here, we demonstrate a photoactive spinel Co3O4 electrode grown by the Kirkendall diffusion thermal oxidation of Co nanoparticles. The thickness-dependent structural, physical, optical, and electrical properties of Co3O4 samples are comprehensively studied. Our analysis shows that two bandgaps of 1.5 eV and 2.1 eV coexist with p-type conductivity in porous and semitransparent Co3O4 samples, which exhibit light-induced photocurrent in photoelectrochemical cells (PEC) containing the alkaline electrolyte. The thickness-dependent properties of Co3O4 related to its use as a working electrode in PEC cells are extensively studied and show potential for the application in water oxidation and reduction processes. To demonstrate the stability, an alkaline cell was composed for the water splitting system by using two Co3O4 photoelectrodes. The oxygen gas generation rate was obtained to be 7.17 mL·h−1 cm−1. Meanwhile, hydrogen gas generation rate was almost twice of 14.35 mL·h−1·cm−1 indicating the stoichiometric ratio of 1:2. We propose that a semitransparent Co3O4 photoactive electrode is a prospective candidate for use in PEC cells via heterojunctions for hydrogen generation.

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