A Rapid Solar Reduction Method to TiO2/MoO2/Graphene Nanocomposites for Photocatalytic Water Splitting

2015 ◽  
Vol 1738 ◽  
Author(s):  
Jyothirmayee Aravind.S.S ◽  
Kandalam Ramanujachary ◽  
Timothy D. Vaden ◽  
Amos Mugweru
Keyword(s):  
Water Splitting ◽  
Reduction Method ◽  
High Current Density ◽  
Phase Identification ◽  
Co Catalyst ◽  
Graphene Nanocomposites ◽  
Photocatalytic Water Splitting ◽  
Earth Abundant ◽  
Co Reduction ◽  
Interesting Area

ABSTRACTSemiconductor photocatalysis has emerged as an interesting area of research since the discovery of Honda-Fujishima effect. In this study, TiO2/MoO2/graphene composites have been prepared by a solar radiation-assisted co-reduction method, wherein ammonium tetrathiomolybdate salt and graphite oxide are reduced to MoO2 and graphene respectively along with TiO2. The method involved the utilization of focused pulses of natural sunlight using a simple convex lens, thereby eliminating the need for harmful reducing agents. The compound was characterized by XRD and SEM for phase identification and morphology. The TiO2/MoO2/graphene composite exhibits superior photocatalytic water splitting activity without using a co-catalyst. In addition, we demonstrate the electrocatalytic hydrogen production using this earth abundant catalyst, which shows high current density (60 mA/cm2) and low Tafel slope (47 mV/dec). The hydrogen evolved during photocatalysis was detected by gas chromatography.

Assembly of thiacalix[4]arene-supported high-nuclearity Cd24 cluster with enhanced photocatalytic activity

Nanoscale ◽  
2018 ◽  
Vol 10 (30) ◽  
pp. 14448-14454 ◽  
Author(s):  
Cheng Shi ◽  
Min Zhang ◽  
Xinxin Hang ◽  
Yanfeng Bi ◽  
Liangliang Huang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Splitting ◽  
Co Catalyst ◽  
Photocatalytic Water Splitting

A high-nuclearity Cd24 cluster built from Cd4-thiacalix[4]arene SBUs and in situ generated peroxyphosphate PO53− exhibited significant photocatalytic water splitting activity in absence of a co-catalyst.

scholarly journals Mechanism for spontaneous oxygen and hydrogen evolution reactions on CoO nanoparticles

2019 ◽  
Vol 7 (12) ◽  
pp. 6708-6719 ◽  
Author(s):  
Kyoung-Won Park ◽  
Alexie M. Kolpak
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
High Efficiency ◽  
Applied Bias ◽  
Co Catalyst ◽  
Photocatalytic Water Splitting ◽  
Overall Water Splitting ◽  
Nanoparticle Suspensions ◽  
Hydrogen Evolution Reactions ◽  
Coo Nanoparticles

Overall photocatalytic water splitting with a high efficiency has recently been observed for CoO nanoparticle suspensions in the absence of an applied bias or co-catalyst. This study clarifies the mechanism of spontaneous overall water splitting with the prominent efficiency observed on the CoO nanoparticle.

ChemInform Abstract: Earth-Abundant Cocatalysts for Semiconductor-Based Photocatalytic Water Splitting

ChemInform ◽  
2014 ◽  
Vol 46 (3) ◽  
pp. no-no ◽  
Author(s):  
Jingrun Ran ◽  
Jun Zhang ◽  
Jiaguo Yu ◽  
Mietek Jaroniec ◽  
Shi Zhang Qiao
Keyword(s):  
Water Splitting ◽  
Photocatalytic Water Splitting ◽  
Earth Abundant

Earth-abundant cocatalysts for semiconductor-based photocatalytic water splitting

2014 ◽  
Vol 43 (22) ◽  
pp. 7787-7812 ◽  
Author(s):  
Jingrun Ran ◽  
Jun Zhang ◽  
Jiaguo Yu ◽  
Mietek Jaroniec ◽  
Shi Zhang Qiao
Keyword(s):  
Water Splitting ◽  
Cost Effective ◽  
Photocatalytic Water Splitting ◽  
Highly Efficient ◽  
Earth Abundant

Active and robust cocatalysts constructed from earth-abundant elements greatly contribute to the highly efficient, stable and cost-effective photocatalytic water splitting.

scholarly journals Sb2S3/TiO2 Heterojunction Photocathodes: Band Alignment and Water Splitting Properties

2020 ◽  
Author(s):  
Rajiv Ramanujam Prabhakar ◽  
Thomas Moehl ◽  
Sebastian Siol ◽  
Jihye Suh ◽  
David Tilley
Keyword(s):  
Buffer Layer ◽  
Water Splitting ◽  
Elemental Sulfur ◽  
Band Alignment ◽  
Band Bending ◽  
Co Catalyst ◽  
Conduction Band Offset ◽  
Photovoltaic Applications ◽  
Earth Abundant ◽  
Further Development

<p>Antimony sulfide (Sb<sub>2</sub>S<sub>3</sub>) is a promising light absorbing semiconductor for photovoltaic applications, though it remains vastly unexplored for photoelectrochemical water splitting. Sb<sub>2</sub>S<sub>3</sub> was synthesized by a simple sulfurization of electrodeposited antimony metal at relatively low temperatures (240-300°C) with elemental sulfur. Using a TiO<sub>2</sub> buffer layer and a platinum co-catalyst, photocurrent densities up to ~ 9 mA cm<sup>-2</sup> were achieved at -0.4 V vs. RHE in 1 M H<sub>2</sub>SO<sub>4</sub> under one sun illumination. Using XPS band alignment studies and potential dependent IPCE measurements, a conduction band offset of 0.7 eV was obtained for the Sb<sub>2</sub>S<sub>3</sub>/TiO<sub>2 </sub>junction as well as an unfavorable band bending at the heterointerface, which explains the low photovoltage that was observed (~ 0.1 V).<sub> </sub>Upon inserting an In<sub>2</sub>S<sub>3</sub> buffer layer, which offers a better band alignment, a 0.15 V increase in photovoltage was obtained. The excellent PEC performance and the identification of the origin of the low photovoltage of the Sb<sub>2</sub>S<sub>3</sub> photocathodes in this work pave the way for the further development of this promising earth abundant light absorbing semiconductor for solar fuels generation.</p>

Porous direct Z-scheme heterostructures of S-deficient CoS/CdS hexagonal nanoplates for robust photocatalytic H2 generation

CrystEngComm ◽  
2021 ◽  
Author(s):  
Zhihui Li ◽  
Hanchu Chen ◽  
Yanyan Li ◽  
Hui Wang ◽  
Yanru Liu ◽  
...  
Keyword(s):  
Water Splitting ◽  
H2 Production ◽  
Solar Fuels ◽  
Photocatalytic Water Splitting ◽  
H2 Generation ◽  
Earth Abundant ◽  
Semiconductor Heterojunctions ◽  
Photocatalytic H2 Generation ◽  
Hexagonal Nanoplates

Photocatalytic water-splitting with Z-scheme semiconductor heterojunctions is a promising way to achieve renewable solar fuels. Nevertheless, developing earth-abundant direct Z-scheme photocatalytic systems for efficient H2 production is still under-developed. In...

scholarly journals Unraveling the synergy between metal–organic frameworks and co-catalysts in photocatalytic water splitting

2020 ◽  
Vol 8 (39) ◽  
pp. 20493-20502
Author(s):  
Stefano Falletta ◽  
Patrick Gono ◽  
Zhendong Guo ◽  
Stavroula Kampouri ◽  
Kyriakos C. Stylianou ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photocatalytic Performance ◽  
Metal Organic Frameworks ◽  
Water Systems ◽  
Band Alignment ◽  
Co Catalyst ◽  
Photocatalytic Water Splitting ◽  
Co Catalysts ◽  
Metal Organic

Theoretical methodologies for the band alignment at MOF/co-catalyst/water systems revealing the electronic and atomistic mechanisms underlying their photocatalytic performance.

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