An artificial photosynthetic system with CO2-reducing solar-to-fuel efficiency exceeding 20%

2020 ◽  
Vol 8 (35) ◽  
pp. 18310-18317 ◽  
Author(s):  
Yanjun Xiao ◽  
Yao Qian ◽  
Anqi Chen ◽  
Tian Qin ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Solar Energy ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Fuel Efficiency ◽  
Photosynthetic System ◽  
Artificial Photosynthetic ◽  
Renewable Hydrogen

Artificial photosynthetic systems store solar energy in chemical fuels via CO2 reduction or renewable hydrogen evolution from water splitting.

SIn2Te/TeIn2Se: a type-II heterojunction as water-splitting photocatalyst with high solar energy harvesting

2021 ◽  
Author(s):  
Peishen Shang ◽  
Chunxiao Zhang ◽  
Mengshi Zhou ◽  
Chaoyu He ◽  
Tao Ouyang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Solar Energy ◽  
Water Splitting ◽  
First Principles ◽  
Type Ii ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Solar Energy Harvesting ◽  
Renewable Hydrogen

Searching for photocatalysts is crucial for the production of renewable hydrogen from water. Two-dimensional (2D) vdW heterojunctions show great potential. Using first- principles calculations within the HSE06 functional, we propose...

scholarly journals Solar Energy Harvesting with Carbon Nitrides: Do We Understand the Mechanism?

2018 ◽  
Author(s):  
Wolfgang Domcke ◽  
Johannes Ehrmaier ◽  
Andrzej L. Sobolewski
Keyword(s):  
Excited State ◽  
Solar Energy ◽  
Water Molecule ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydroxyl Radicals ◽  
Carbon Nitride ◽  
Carbon Nitrides ◽  
Polymeric Carbon ◽  
Carbon Nitride Materials

The photocatalytic splitting of water into molecular hydrogen and molecular oxygen with sunlight is the dream reaction for solar energy conversion. Since decades, transition-metal-oxide semiconductors and supramolecular organometallic structures have been extensively explored as photocatalysts for solar water splitting. More recently, polymeric carbon nitride materials consisting of triazine or heptazine building blocks have attracted considerable attention as hydrogen-evolution photocatalysts. The mechanism of hydrogen evolution with polymeric carbon nitrides is discussed throughout the current literature in terms of the familiar concepts developed for photoelectrochemical water splitting with semiconductors since the 1970s. We discuss in this perspective an alternative mechanistic paradigm for photoinduced water splitting with carbon nitrides, which focusses on the specific features of the photochemistry of aromatic N-heterocycles in aqueous environments. It is shown that a water molecule which is hydrogen-bonded to an N-heterocycle can be decomposed into hydrogen and hydroxyl radicals by two simple sequential photochemical reactions. This concept is illustrated by first-principles calculations of excited-state reaction paths and their energy profiles for hydrogen-bonded complexes of pyridine, triazine and heptazine with a water molecule. It is shown that the excited-state hydrogen-transfer and hydrogen-detachment reactions are essentially barrierless, in sharp contrast to water oxidation in the electronic ground state, where high barriers prevail. We also discuss in some detail the products of possible reactions of the highly reactive hydroxyl radicals with the chromophores. We hypothesize that the challenge of efficient solar hydrogen generation with carbon-nitride materials is less the decomposition of water as such, but rather the controlled recombination of the photogenerated radicals to the closed-shell products H2 and H2O2.

Nickel sulfides for electrocatalytic hydrogen evolution under alkaline conditions: a case study of crystalline NiS, NiS2, and Ni3S2 nanoparticles

2016 ◽  
Vol 6 (4) ◽  
pp. 1077-1084 ◽  
Author(s):  
Nan Jiang ◽  
Qing Tang ◽  
Meili Sheng ◽  
Bo You ◽  
De-en Jiang ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Wind Power ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Alkaline Conditions ◽  
And Storage

Electrocatalytic water splitting to produce H2 plays an important role in the capture, conversion, and storage of renewable energy sources, such as solar energy and wind power.

Silicon Nanowire-Ta2O5-NGQD Heterostructure: An Efficient Photocathode for Photoelectrochemical Hydrogen Evolution

2021 ◽  
Author(s):  
Sk. Riyajuddin ◽  
Jenifar Sultana ◽  
Shumile Ahmed Siddiqui ◽  
Sushil Kumar ◽  
Damini Badhwar ◽  
...  
Keyword(s):  
Solar Energy ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Large Scale ◽  
Silicon Nanowire ◽  
Research Interest ◽  
Hydrogen Fuel ◽  
Environment Friendly ◽  
Pec Water Splitting

Photoelectrochemical (PEC) water splitting propels a broader research interest for large-scale and facile entrapment of solar energy in hydrogen fuel. It offers the most favorable and environment-friendly approach to harvest...

Stable solar-driven water splitting by anodic ZnO nanotubular semiconducting photoanodes

RSC Advances ◽  
2016 ◽  
Vol 6 (83) ◽  
pp. 80221-80225 ◽  
Author(s):  
Alaa Y. Faid ◽  
Nageh K. Allam
Keyword(s):  
Solar Energy ◽  
Water Splitting ◽  
High Performance ◽  
Chemical Bonds ◽  
Artificial Photosynthetic

The development of high performance artificial photosynthetic devices, to store solar energy in chemical bonds, requires the existence of stable light-absorbing electrodes for both the oxidative and reductive half-reactions.

scholarly journals Photocatalytic Hydrogen Evolution via Water Splitting: A Short Review

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 655 ◽  
Author(s):  
Yifan Zhang ◽  
Young-Jung Heo ◽  
Ji-Won Lee ◽  
Jong-Hoon Lee ◽  
Johny BajGai ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Solar Energy ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Future Development ◽  
Rational Design ◽  
Short Review ◽  
H2 Production ◽  
H2 Generation ◽  
Photocatalytic H2 Generation

Photocatalytic H2 generation via water splitting is increasingly gaining attention as a viable alternative for improving the performance of H2 production for solar energy conversion. Many methods were developed to enhance photocatalyst efficiency, primarily by modifying its morphology, crystallization, and electrical properties. Here, we summarize recent achievements in the synthesis and application of various photocatalysts. The rational design of novel photocatalysts was achieved using various strategies, and the applications of novel materials for H2 production are displayed herein. Meanwhile, the challenges and prospects for the future development of H2-producing photocatalysts are also summarized.

scholarly journals Solar Energy Harvesting with Carbon Nitrides: Do We Understand the Mechanism?

2018 ◽  
Author(s):  
Wolfgang Domcke ◽  
Johannes Ehrmaier ◽  
Andrzej L. Sobolewski
Keyword(s):  
Excited State ◽  
Solar Energy ◽  
Water Molecule ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydroxyl Radicals ◽  
Carbon Nitride ◽  
Carbon Nitrides ◽  
Polymeric Carbon ◽  
Carbon Nitride Materials

The photocatalytic splitting of water into molecular hydrogen and molecular oxygen with sunlight is the dream reaction for solar energy conversion. Since decades, transition-metal-oxide semiconductors and supramolecular organometallic structures have been extensively explored as photocatalysts for solar water splitting. More recently, polymeric carbon nitride materials consisting of triazine or heptazine building blocks have attracted considerable attention as hydrogen-evolution photocatalysts. The mechanism of hydrogen evolution with polymeric carbon nitrides is discussed throughout the current literature in terms of the familiar concepts developed for photoelectrochemical water splitting with semiconductors since the 1970s. We discuss in this perspective an alternative mechanistic paradigm for photoinduced water splitting with carbon nitrides, which focusses on the specific features of the photochemistry of aromatic N-heterocycles in aqueous environments. It is shown that a water molecule which is hydrogen-bonded to an N-heterocycle can be decomposed into hydrogen and hydroxyl radicals by two simple sequential photochemical reactions. This concept is illustrated by first-principles calculations of excited-state reaction paths and their energy profiles for hydrogen-bonded complexes of pyridine, triazine and heptazine with a water molecule. It is shown that the excited-state hydrogen-transfer and hydrogen-detachment reactions are essentially barrierless, in sharp contrast to water oxidation in the electronic ground state, where high barriers prevail. We also discuss in some detail the products of possible reactions of the highly reactive hydroxyl radicals with the chromophores. We hypothesize that the challenge of efficient solar hydrogen generation with carbon-nitride materials is less the decomposition of water as such, but rather the controlled recombination of the photogenerated radicals to the closed-shell products H2 and H2O2.

13C-Labeling the carbon-fixation pathway of a highly efficient artificial photosynthetic system

2017 ◽  
Vol 198 ◽  
pp. 529-537 ◽  
Author(s):  
Chong Liu ◽  
Shannon N. Nangle ◽  
Brendan C. Colón ◽  
Pamela A. Silver ◽  
Daniel G. Nocera
Keyword(s):  
Water Splitting ◽  
Carbon Fixation ◽  
High Efficiency ◽  
Ralstonia Eutropha ◽  
Gas Chromatography Mass Spectrometry ◽  
Monod Model ◽  
Photosynthetic System ◽  
System P ◽  
Artificial Photosynthetic ◽  
Viable Approach

Interfacing the CO2-fixing microorganism, Ralstonia eutropha, to the energy derived from hydrogen produced by water splitting is a viable approach to achieving renewable CO2 reduction at high efficiencies. We employ 13C-labeling to report on the nature of CO2 reduction in the inorganic water splitting|R. eutropha hybrid system. Accumulated biomass in a reactor under a 13C-enriched CO2 atmosphere may be sampled at different time points during CO2 reduction. Converting the sampled biomass into gaseous CO2 allows the 13C/12C ratio to be determined by gas chromatography-mass spectrometry. After 2 hours of inoculation and the initiation of water splitting, the microbes adapted and began to convert CO2 into biomass. The observed time evolution of the 13C/12C ratio in accumulated biomass is consistent with a Monod model for carbon fixation. Carbon dioxide produced by catabolism was found to be minimal. This rapid response of the bacteria to a hydrogen input and to subsequent CO2 reduction at high efficiency are beneficial to achieving artificial photosynthesis for the storage of renewable energy.

Recent developments in heterogeneous photocatalysts for solar-driven overall water splitting

2019 ◽  
Vol 48 (7) ◽  
pp. 2109-2125 ◽  
Author(s):  
Zheng Wang ◽  
Can Li ◽  
Kazunari Domen
Keyword(s):  
Solar Energy ◽  
Water Splitting ◽  
Large Scale ◽  
Cost Effective ◽  
Hydrogen Energy ◽  
Overall Water Splitting ◽  
Effective Technology ◽  
Recent Developments ◽  
Renewable Hydrogen

Overall water splitting based on particulate photocatalysts is an easily constructed and cost-effective technology for the conversion of abundant solar energy into clean and renewable hydrogen energy on a large scale.

Panoramic insights into semi-artificial photosynthesis: origin, development, and future perspective

2022 ◽  
Author(s):  
Zhifeng Jiang ◽  
Kemeng Xiao ◽  
Jun Liang ◽  
Xinyu Wang ◽  
Tianfeng Hou ◽  
...  
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Artificial Photosynthesis ◽  
Solar Energy Conversion ◽  
Future Perspective ◽  
Photosynthetic System ◽  
Synthetic Materials ◽  
Artificial Photosynthetic

Semi-artificial photosynthetic system (SAPS) integrates the strengths of natural and artificial photosynthesis for solar energy conversion. Synthetic materials and biological components both play indispensable roles, where the former can be...

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