Hydrogen and Oxygen Evolution in a Membrane Photoreactor Using Suspended Nanosized Au/TiO2 and Au/CeO2

Photocatalysis combined with membrane technology could offer an enormous potential for power generation in a renewable and sustainable way. Herein, we describe the one-step hydrogen and oxygen evolution through a photocatalytic membrane reactor. Experimental tests were carried out by means of a two-compartment cell in which a modified Nafion membrane separated the oxygen and hydrogen evolution semi-cells, while iron ions permeating through the membrane acted as a redox mediator. Nanosized Au/TiO2 and Au/CeO2 were employed as suspended photocatalysts for hydrogen and oxygen generation, respectively. The influence of initial Fe3+ ion concentration, ranging from 5 to 20 mM, was investigated, and the best results in terms of hydrogen and oxygen evolution were registered by working with 5 mM Fe3+. The positive effect of gold on the overall water splitting was confirmed by comparing the photocatalytic results obtained with the modified/unmodified titania and ceria. Au-loading played a key role for controlling the photocatalytic activity, and the optimal percentage for hydrogen and oxygen generation was 0.25 wt%. Under irradiation with visible light, hydrogen and oxygen were produced in stoichiometric amounts. The crucial role of the couple Fe3+/Fe2+ and of the membrane on the performance of the overall photocatalytic system was found.

Download Full-text

One-step electrodeposition of cerium-doped nickel hydroxide nanosheets for effective oxygen generation

RSC Advances ◽

10.1039/c9ra02682g ◽

2019 ◽

Vol 9 (31) ◽

pp. 17891-17896 ◽

Cited By ~ 3

Author(s):

Gang Fang ◽

Jinhua Cai ◽

Zhipeng Huang ◽

Chi Zhang

Keyword(s):

Oxygen Evolution ◽

Nickel Hydroxide ◽

Oxygen Evolution Reaction ◽

Oxygen Generation ◽

One Step ◽

Cerium Doping

Cerium doping is effective approach to promoting performance of nickel hydroxide in oxygen evolution reaction.

Download Full-text

Metal organic framework derived CoFe@N-doped carbon/reduced graphene sheets for enhanced oxygen evolution reaction

Inorganic Chemistry Frontiers ◽

10.1039/c8qi00479j ◽

2018 ◽

Vol 5 (8) ◽

pp. 1962-1966 ◽

Cited By ~ 19

Author(s):

Fanhao Kong ◽

Kunfeng Chen ◽

Shuyan Song ◽

Dongfeng Xue

Keyword(s):

Prussian Blue ◽

Oxygen Evolution ◽

Oxygen Evolution Reaction ◽

Metal Organic Framework ◽

Graphene Sheets ◽

Prussian Blue Analogues ◽

Reduced Graphene ◽

Metal Organic ◽

One Step ◽

The One

Architectures of CoFe@N-doped carbon/wrinkled rGO sheets are synthesizedviathe one-step annealing of Prussian blue analogues and GO sheet composites. The optimized structure exhibits a low overpotential of 278 mV to drive 10 mA cm−2and has a durable stability.

Download Full-text

A ball-milling synthesis of N-graphyne with controllable nitrogen doping sites for efficient electrocatalytic oxygen evolution and supercapacitors

Dalton Transactions ◽

10.1039/d0dt01855d ◽

2020 ◽

Vol 49 (31) ◽

pp. 10958-10969 ◽

Cited By ~ 3

Author(s):

Wen Ding ◽

Mingxuan Sun ◽

Bowen Gao ◽

Wenzhu Liu ◽

Zhipeng Ding ◽

...

Keyword(s):

Ball Milling ◽

Oxygen Evolution ◽

Nitrogen Doping ◽

Novel Structure ◽

One Step ◽

The One

N-Graphyne, with a novel structure, was synthesized by the one-step ball milling of CaC2 and pyrazine; its excellent electrocatalytic and supercapacitor properties were confirmed.

Download Full-text

Hydrothermal synthesis of BiVO4/Bi2MoO6 composites with enhanced photocatalytic activity

International Journal of Modern Physics B ◽

10.1142/s0217979217440593 ◽

2017 ◽

Vol 31 (16-19) ◽

pp. 1744059 ◽

Cited By ~ 1

Author(s):

Chaoqi Xu ◽

Hongzhi Qian ◽

Haibo Yong ◽

Xiaogu Huang ◽

Wei Wang ◽

...

Keyword(s):

Photocatalytic Activity ◽

Molar Ratio ◽

Moderate Amount ◽

Molar Ratios ◽

Photocatalytic Activities ◽

Efficient Charge ◽

One Step ◽

Carrier Separation ◽

The One ◽

Positive Effect

BiVO4/Bi2MoO6 composites have been fabricated via the one-step hydrothermal method. The properties of composites were tailored by altering the V/Mo molar ratios. Photocatalytic activities were evaluated by measuring degradation of RhB under visible-light irradiation. BiVO4/Bi2MoO6 composites with V/Mo molar ratio of 8:1 possessing the optimal photocatalytic performance. The enhanced photocatalytic activity was attributed to the efficient charge carrier separation of composite heterostructures. In addition, the study of adsorption and photocatalytic activity suggested that a moderate amount of adsorption has a positive effect on photocatalytic reaction.

Download Full-text

Synthesis of Poly(Trimethylene Carbonate) from Amine Group Initiation: Role of Urethane Bonds in the Crystallinity

Polymers ◽

10.3390/polym13020280 ◽

2021 ◽

Vol 13 (2) ◽

pp. 280

Author(s):

Thomas Brossier ◽

Gael Volpi ◽

Vincent Lapinte ◽

Sebastien Blanquer

Keyword(s):

Thermal Studies ◽

Trimethylene Carbonate ◽

X Ray Diffraction ◽

One Pot ◽

Free Process ◽

One Step ◽

The One ◽

Natural Amino Acids ◽

The Impact

Semi-crystalline poly(trimethylene carbonate) (PTMC) can be efficiently prepared by ring-opening polymerization (ROP) initiated by amine using various catalysts. More promising results were reached with the one-step process of stannous octanoate unlike the two-step one-pot reaction using TBD and MSA catalysts. The ROP-amine of TMC consists in a simple isocyanate free process to produce polycarbonate-urethanes, compatible with the large availability of amines ranging from mono- to multifunctional until natural amino acids. ROP-amine of TMC leads to urethane bonds monitored by FTIR spectroscopy. The relationship between the nature of amines and the crystallinity of PTMC was discussed through X-ray diffraction and thermal studies by DSC and TGA. The impact of the crystallinity was also demonstrated on the mechanical properties of semi-crystalline PTMC in comparison to amorphous PTMC, synthesized by ROP initiated by alcohol. The semi-crystalline PTMC synthesized by ROP-amine opens many perspectives.

Download Full-text