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Zi-You Yu et al.
Summary: The hydrogen economy has emerged as a promising alternative to the current hydrocarbon economy, involving the use of renewable energy to split water into hydrogen and oxygen for further utilization as clean fuel. Among various water electrolysis technologies, alkaline water splitting has been commercialized for over 100 years and is considered the most mature and economic option. Advanced nonprecious metal electrocatalysts have shown potential for improving the efficiency and stability of alkaline water splitting processes, with a focus on catalyst synthesis and performance improvement.
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Tengfei Ma et al.
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ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
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Hongjiao Chen et al.
Summary: By designing an artificial sandwich-like catalyst, a highly efficient electrocatalyst with bifunctional oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities in alkaline seawater was successfully synthesized. The utilization of the 3D wood aerogel features significantly enhanced the efficiency of seawater electrolysis.
APPLIED CATALYSIS B-ENVIRONMENTAL
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Wei Lai et al.
Summary: By employing a simple aging protocol, the AC-Ni/NF catalyst with Ni/Ni(OH)(2) heterostructure exhibits remarkable performance in the hydrogen evolution reaction, showing a positive correlation between the amount of Ni/Ni(OH)(2) and the electrode's performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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Boreum Lee et al.
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RENEWABLE & SUSTAINABLE ENERGY REVIEWS
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Fu Sun et al.
Summary: A potential solution to grid-scale production of carbon-neutral hydrogen energy without reliance on freshwater is demonstrated through chlorine-free hydrogen production by hybrid seawater splitting coupling hydrazine degradation. The electrolyzer achieves a high hydrogen production rate at low electricity expense and avoids chlorine electrochemistry in complex chemical environments. By integrating low-voltage direct hydrazine fuel cells or solar cells, self-powered hybrid seawater electrolysis is realized, enabling efficient conversion of ocean resources to hydrogen fuel while removing harmful pollutants.
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Soeren Dresp et al.
Summary: NiFe layered double hydroxides (LDHs) are efficient electrocatalysts for alkaline oxygen evolution reaction (OER) and selective seawater oxidation. The study investigates the operando structure-reactivity of NiFe LDH in alkaline and alkalinized NaCl electrolytes, revealing the influence of pH and NaCl concentration on the electrocatalytic performance.
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Pau Farras et al.
Summary: Researchers conducted a quantitative analysis to assess the economic feasibility of direct seawater electrolysis as a sustainable energy source.
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Saikat Bolar et al.
Summary: Hydrogen energy is considered a renewable source to combat current energy crises and balance environmental impact from fossil fuel use. Seawater electrolysis is a feasible method, but challenges need to be addressed to improve performance through systematic study of key parameters. This review offers a comprehensive understanding of existing shortcomings and potential solutions for seawater electrolysis for the benefit of mankind.
SUSTAINABLE ENERGY & FUELS
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Weiran Zheng et al.
Summary: Direct seawater electrolysis offers a new opportunity to reduce the cost of hydrogen production, but challenges in long-term performance stability must be addressed. Common causes of performance decline during seawater electrolysis are discussed, along with ongoing efforts in counter-measurements such as electrocatalyst optimization and cell design. The need for a consensus on evaluating the stability of seawater electrolysis is emphasized.
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Chemistry, Physical
Ping Yan et al.
Summary: Transition metal phosphides (TMPs) have been reported as efficient pre-catalysts for the oxygen evolution reaction (OER) in alkaline media. In this study, hollow nanostructured Ni5P2/FeP4 nanoboxes (NiFeP NBs) were designed and synthesized as pre-catalysts, which deeply reconstructed into low-crystalline and ultrathin NiOOH/FeOOH nanosheet assembled nanoboxes (NiOOH/FeOOH NBs) during the OER process, exhibiting superior OER activity and excellent stability.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
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J. Niklas Hausmann et al.
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)
Review
Chemistry, Multidisciplinary
Fanghao Zhang et al.
Summary: This review discusses the challenges and strategies for improving the efficiency and stability of seawater electrolysis, focusing on the design of OER catalysts. Various approaches such as constructing 3D hierarchical porous structures, using protective layers, and controlling surface wettability are recommended to synthesize efficient and stable OER catalysts. Additionally, the perspective of designing high-performance catalysts for seawater electrolysis is also provided.
TRENDS IN CHEMISTRY
(2021)
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Yoo Sei Park et al.
Summary: A Ni-doped FeOOH anode was developed for high-efficiency anion exchange membrane alkaline seawater electrolysis, showing good catalytic activity in half-cell tests and higher performance in 1.0 M KOH + seawater. The anion exchange membrane electrolyzer catalyzed by Ni-doped FeOOH exhibited a high current density and energy conversion efficiency in seawater conditions.
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Summary: Seawater is considered a major hydrogen reservoir, but the presence of multielements and interference in electrochemistry, particularly chlorine chemistry, make electrocatalytic water splitting challenging. To achieve sustainable seawater electrolysis, focus should not only on electrocatalyst activity but also on selective oxygen evolution reaction to suppress corrosive chlorine chemistry.
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Summary: Seawater is considered a major hydrogen reservoir, but the presence of multiple elements and interference in electrochemistry, especially chlorine chemistry, make seawater electrolysis challenging. To make seawater electrolysis sustainable, efficient oxygen evolution reaction and suppression of corrosive chlorine chemistry by electrocatalysts are highly desirable.
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