Article
Chemistry, Physical
Jooyoung Lee, Hyeonjung Jung, Yoo Sei Park, Nayoung Kwon, Seongwon Woo, N. Clament Sagaya Selvam, Gill Sang Han, Hyun Suk Jung, Pil J. Yoo, Sung Mook Choi, Jeong Woo Han, Byungkwon Lim
Summary: Developing high-efficiency and cost-efficient electrodes for hydrogen and oxygen evolution reactions is a major challenge in water electrolysis technology. A chemical transformation route was developed to produce high-performance OER and HER electrodes, which outperformed most other catalysts reported to date. An alkaline water electrolyzer based on these electrodes achieved a current density of 10 mA/cm(2) at an only 1.47 V-cell, while an anion exchange membrane water electrolyzer reached a current density of 500 mA/cm(2) at an only 1.75 V-cell.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Review
Chemistry, Physical
M. Gopinath, R. Marimuthu
Summary: This paper discusses different generation methods of hydrogen using solar energy as a triggering agent, specifically indirect techniques. The indirect methods include bio photolysis, thermochemical, photolysis, and electrolysis, with electrolysis having the highest energy and exergy efficiency. Thermochemical ranks low in terms of raw material availability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Analytical
Matias Albornoz, Marco Rivera, Patrick Wheeler, Roberto Ramirez
Summary: Pulsed electrolysis has emerged as a promising research topic due to advancements in solid-state semiconductor devices. These technologies have allowed for the development of simpler, more efficient, and cost-effective high-voltage and high-frequency power converters. This paper investigates high-voltage pulsed electrolysis considering variations in both power converter parameters and cell configuration. Experimental results demonstrate the potential of pulsed plasmolysis as a method for hydrogen production by decomposing water.
Article
Thermodynamics
Jonathan Perry, Timothy W. Jones, Juan M. Coronado, Scott W. Donne, Alicia Bayon
Summary: Green hydrogen is a clean fuel that has the potential to transform the transportation industry in the coming decades. The most promising methods for producing green hydrogen are solar electrochemical (EC) and solar thermochemical hydrogen (SCTH). While high-temperature solid oxide electrolysis (SOE) is a mature technology, it suffers from durability issues. On the other hand, two-step solar thermochemical hydrogen (STCH) offers greater durability but lower efficiency. A novel process called electrochemically assisted solar thermochemical hydrogen production (EC-STCH) is proposed, which combines the advantages of both SCTH and EC technologies.
Article
Energy & Fuels
Tim Arthur, Graeme J. Millar, Emilie Sauret, Jonathan Love
Summary: This study evaluated the potential benefits of thermally integrating a membrane distillation heat exchanger (MDHX) with water electrolysis for thermal management of waste heat and simultaneous production of fresh water for hydrogen production. A MATLAB model was used to simulate a combined MDHX and water electrolysis stack, showing that the MDHX-EC system can regulate the temperature of an AEM electrolyser and produce fresh water at the same rate as water consumption. These results suggest that further experimental studies should be conducted to explore the performance and economic benefits of this integrated system.
Article
Chemistry, Physical
Tory Borsboom-Hanson, Thomas Holm, Walter Merida
Summary: This study develops a framework to explore the use of supercritical water in alkaline electrolysis and investigates the activation energies and trends of sub- and supercritical water electrolysis through Arrhenius analysis and conductivity analysis of solutions, revealing a discontinuity between them.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
J. Niklas Hausmann, Robert Schloegl, Prashanth W. Menezes, Matthias Driess
Summary: Electrocatalytic water splitting is essential for green fuel production in a sustainable energy economy, with recent studies focusing on direct seawater splitting. However, the challenges and drawbacks of direct seawater splitting compared to conventional water splitting show that the former may not have significant advantages in terms of energy requirements and costs.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Energy & Fuels
Yuhang Li, Yue Hu, Jiankang Chu, Yucheng Yao, Hui Lv, Cheng Xu
Summary: This study proposes a green hybrid system for methanol production using CO2 hydrogeneration. The system utilizes full spectrum solar energy to generate heat and electrical energy for solvent regeneration and water electrolysis, respectively. Heat integration is performed to recover waste heat and minimize energy requirements. The system achieves high overall efficiency and CO2 capture with the potential for renewable energy utilization and storage.
Article
Chemistry, Physical
Alberto Boretti
Summary: The manuscript reviews thermochemical water-splitting cycles for producing hydrogen coupled with high temperature concentrated solar energy. The review shows that three-step cycles benefit the most from synergy with higher solar flux dispatchable concentrated solar power. Preliminary evaluations suggest that three-step cycles may enable CO2-free hydrogen production within a decade at a competitive cost.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Zhicong Fang, Zhiguang Chen, Zekun Yang, Shuhao Zhang
Summary: This research proposes the use of a cascade heat pump to recover the latent heat from electrolysis products and generate steam, resulting in significant energy savings. It also emphasizes the importance of the hydrogen and water proportion in electrolysis products for energy efficiency.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Engineering, Environmental
Gabriel Wosiak, Jeyse da Silva, Sthefany S. Sena, Renato N. de Andrade, Ernesto Pereira
Summary: The study investigates the behavior of gas bubbles during electrochemical processes, focusing on their impact on cell overpotential, electrode surface coverage, and energy consumption during the reaction. By combining experimental and computational approaches, the researchers measured solution velocities, developed a computational fluid dynamics model, and simulated bubble displacement under different conditions. Significant changes in surface coverage were observed during the electrochemical reaction, with up to a 23% increase compared to different areas of the electrode.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Daniela Lopes, Nuno F. Santos, Jorge P. Moura, Antonio J. S. Fernandes, Florinda M. Costa, Andrei Kovalevsky
Summary: Efficient energy storage from intermittent renewables can rely on alkaline electrolysis for converting temporary energy excess into oxygen and green hydrogen. Electrodes made of laser-induced graphene (LIG) materials are promising for water splitting but require proper design and processing optimization. This study focuses on the effects of laser processing on LIG electrode performance in alkaline media and provides guidelines for hydrogen production by selecting suitable laser processing conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Yuanzheng Long, Cheng Yang, Yulong Wu, Bohan Deng, Ziwei Li, Naveed Hussain, Kuangyu Wang, Ruyue Wang, Xian He, Peng Du, Zeliang Guo, Jialiang Lang, Kai Huang, Hui Wu
Summary: Researchers have developed a novel continuous roll-to-roll process for separate hydrogen and oxygen production, enabling continuous high-purity hydrogen generation. This membrane-free system reduces cost and complexity and allows for the use of renewable energy sources, lowering the carbon footprint of hydrogen production.
Review
Chemistry, Inorganic & Nuclear
Lan Sun, Qiaomei Luo, Zhengfei Dai, Fei Ma
Summary: Water electrolysis is crucial for hydrogen generation, requiring efficient electrocatalysts; Recent advancements include strategies like nanoarchitecturing and heteroatomic doping to enhance electrocatalyst performance; Challenges and opportunities lie ahead for improving water splitting performance.
COORDINATION CHEMISTRY REVIEWS
(2021)
Review
Chemistry, Physical
Ye Zeng, Mengting Zhao, Zihao Huang, Weijie Zhu, Jiaxian Zheng, Qiu Jiang, Zhoucheng Wang, Hanfeng Liang
Summary: This article reviews recent progress in regulation strategies for reconstruction reactions in water electrolysis, including the mechanism of water electrolysis, critical factors of the reconstruction process, advanced characterization methods, and modulation strategies. The article highlights the effectiveness of regulating the reconstruction process to enhance catalytic performance of electrocatalysts, and discusses future challenges in surface-reconstructed catalysts for water electrolysis.
ADVANCED ENERGY MATERIALS
(2022)
