Hydrogen production by photocatalytic water splitting of aqueous hydrogen iodide over Pt/alkali metal tantalates

2019 ◽  
Vol 3 (11) ◽  
pp. 3021-3028 ◽  
Author(s):  
Hidehisa Hagiwara ◽  
Ittoku Nozawa ◽  
Katsuaki Hayakawa ◽  
Tatsumi Ishihara
Keyword(s):  
Hydrogen Production ◽  
Alkali Metal ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydrogen Iodide ◽  
Photocatalytic Water Splitting

Reduction of the hydrogen evolution overpotential and durability in aqueous HI are important factors for the cocatalyst loaded onto KTaO3.

scholarly journals Tailoring Conjugated Covalent Organic Frameworks in Lieb lattice towards Efficient Photocatalytic Water Splitting

2021 ◽  
Author(s):  
Hongde Yu ◽  
Dong Wang
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Band Alignment ◽  
Covalent Organic Frameworks ◽  
Photocatalytic Water Splitting ◽  
Metal Free ◽  
Chemical Structures ◽  
Lieb Lattice

Photocatalytic water splitting is a promising solution to sustainable hydrogen production. Recently, conjugated covalent organic frameworks (COFs) with highly designable skeleton and inherent pores have emerged as promising photocatalysts for water splitting. However, structure-property relationships in COFs have not been established and the rational design of COFs with suitable electronic properties and chemical structures for water splitting is challenging. In this work, we proposed a facile strategy that is based on tailoring donor (D) and acceptor (A) building blocks of COFs in Lieb lattice, to achieve visible light absorption, prompt exciton dissociation, and metal-free hydrogen evolution. We constructed eight fully conjugated D-A COFs with a pyrene donor node and different acceptor edges linked by C=C and demonstrated that as compared to the D-D COF, D-A design not only shifted optical absorption to the visible and near-infrared region, but also modified band alignment to trigger overall water splitting. Moreover, the charge-transfer excitation in D-A COFs produced space-separated electrons and holes, and the exciton binding energy was substantially reduced due to increased dielectric screening in D-A COFs. Further, we found that the overpotential for hydrogen evolution reaction was suppressed by introducing hydrogen bond interactions in the hydrogen adsorption intermediate to enable metal-free catalysis. Finally, we attained five D-A COFs capable of visible-light-driven hydrogen production in neutral solution without the load of metal co-catalysts. These findings highlight a new route to design COF-photocatalysts and offer tremendous opportunities for regulating COFs towards efficient photocatalytic water splitting and other chemical transformations.

Nitrogen rich carbon nitride synthesized by copolymerization with enhanced visible light photocatalytic hydrogen evolution

2018 ◽  
Vol 42 (2) ◽  
pp. 1087-1091 ◽  
Author(s):  
Liang Luo ◽  
Mei Zhang ◽  
Pei Wang ◽  
Yuanhao Wang ◽  
Fu Wang
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Carbon Nitride ◽  
Photocatalytic Hydrogen Evolution ◽  
Photocatalytic Water Splitting ◽  
Visible Light Photocatalytic

Nitrogen rich carbon nitride synthesized and application for photocatalytic water-splitting hydrogen production.

Semiconductor Photocatalysts for Solar-to-Hydrogen Energy Conversion: Recent Advances of CdS

2020 ◽  
Vol 16 ◽  
Author(s):  
Yuxue Wei ◽  
Honglin Qin ◽  
Jinxin Deng ◽  
Xiaomeng Cheng ◽  
Mengdie Cai ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Noble Metals ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Theoretical Design ◽  
Recent Developments

Introduction: Solar-driven photocatalytic hydrogen production from water splitting is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. In this review, recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. In particular, the factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Background: Photocatalytic hydrogen evolution from water splitting using photocatalyst semiconductors is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. Methods: This review summarizes the recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation. Results: Recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. The factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Conclusion: The state-of-the-art CdS for producing hydrogen from photocatalytic water splitting under visible light is discussed. The future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are also described.

scholarly journals The elusive photocatalytic water splitting reaction using sunlight on suspended nanoparticles: is there a way forward?

2020 ◽  
Vol 10 (2) ◽  
pp. 304-310 ◽  
Author(s):  
Hicham Idriss
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Molecular Hydrogen ◽  
Photocatalytic Water Splitting ◽  
Suspended Nanoparticles

For many decades hydrogen production from water by photocatalytic methods has been pursued over a variety of semiconductor powder catalysts featuring many structures and compositions. The stoichiometric formation of molecular hydrogen and oxygen has stayed largely elusive.

Controllable synthesis of inorganic–organic Zn1−xCdxS-DETA solid solution nanoflowers and their enhanced visible-light photocatalytic hydrogen-production performance

2017 ◽  
Vol 46 (34) ◽  
pp. 11335-11343 ◽  
Author(s):  
Jiali Lv ◽  
Jinfeng Zhang ◽  
Kai Dai ◽  
Changhao Liang ◽  
Guangping Zhu ◽  
...  
Keyword(s):  
Solid Solution ◽  
Hydrogen Production ◽  
Visible Light ◽  
Environmental Pollution ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Production Performance ◽  
Controllable Synthesis ◽  
Visible Light Photocatalytic ◽  
Energy Shortage

Sustainable photocatalytic hydrogen evolution (PHE) of water splitting has been utilized to solve the serious environmental pollution and energy shortage problems over the last decade.

scholarly journals Sunlight-driven photocatalytic hydrogen production from water using metal-doped strontium titanate perovskite

2020 ◽  
Author(s):  
Pushkal Sharma ◽  
Cheng-Ting Lee ◽  
Jeffrey Chi-Sheng Wu
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Strontium Titanate ◽  
Experimental Studies ◽  
Light Response ◽  
Theoretical Studies ◽  
Photocatalytic Water Splitting ◽  
Visible Light Response ◽  
Sacrificial Agent ◽  
Metal Doped

<div>The effects of various metal dopants on the photocatalytic water splitting activity of SrTiO<sub>3</sub> -based photocatalysts were investigated using experimental studies. The SrTiO<sub>3</sub>:Rh (1%) has been found to give the best efficiency in water splitting out of the various metal-doped samples studied. However, the same host doped with other metal dopants such as Fe, V, Ga, and Sb leads to negligible hydrogen evolution even when at least Fe has a better visible light response. Our results accompanied by previously conducted theoretical studies by our group explain the high photocatalytic water splitting activity of Rh doped SrTiO<sub>3 </sub>. Furthermore, the effects of the amount of catalyst, the proportion of sacrificial agent and pH were studied for the SrTiO<sub>3</sub>:Rh (1 mol%) along with studying its activity with seawater.</div>

Ru@N/S/TiO2/rGO: A High Performance HER Electrocatalyst Prepared by Dye-Sensitization

2021 ◽  
Author(s):  
Hai-Lang Jia ◽  
Jiao Zhao ◽  
Zhiyuan Wang ◽  
Rui-Xin Chen ◽  
Mingyun Guan
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydrogen Evolution Reaction ◽  
High Performance ◽  
Dye Sensitization ◽  
Production Methods

Hydrogen production from water-splitting is one of the most promising hydrogen production methods, the preparation of hydrogen evolution reaction (HER) catalyst is very important. Although Pt based materials have the...

Sign in / Sign up

Export Citation Format

Share Document