A membrane-based seawater electrolyser for hydrogen generation

Nature, Journal Year: 2022, Volume and Issue: 612(7941), P. 673 - 678

Published: Nov. 30, 2022

Language: Английский

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Recent Advances in Design of Electrocatalysts for High‐Current‐Density Water Splitting

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(16)

Published: Dec. 4, 2021

Abstract Electrochemical water splitting technology for producing “green hydrogen” is important the global mission of carbon neutrality. Electrocatalysts with decent performance at high current densities play a central role in industrial implementation this technology. This field has advanced immensely recent years, as witnessed by many types catalysts designed and synthesized toward industriallyrelevant (>200 mA cm –2 ). By discussing advances field, several key aspects are summarized that affect catalytic high‐current‐density electrocatalysis, including dimensionality catalysts, surface chemistry, electron transport path, morphology, catalyst‐electrolyte interplay. The multiscale design strategy considers these comprehensively developing electrocatalysts highlighted. perspectives on future directions emerging also put forward.

Language: Английский

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Ni2P/NiMoP heterostructure as a bifunctional electrocatalyst for energy-saving hydrogen production

eScience, Journal Year: 2021, Volume and Issue: 1(1), P. 69 - 74

Published: Sept. 21, 2021

Electrochemical water splitting is a sustainable and feasible strategy for hydrogen production but hampered by the sluggish anodic oxygen evolution reaction (OER). Herein, an effective approach introduced to significantly decrease cell voltage replacing OER with urea oxidation (UOR). A Ni2P/NiMoP nanosheet catalyst hierarchical architecture uniformly grown on nickel foam (NF) substrate through simple hydrothermal phosphorization method. The achieves impressive HER activity, low overpotential of only 22 mV at 10 mA cm–2 Tafel slope 34.5 dec–1. In addition, reduced from 1.49 V 1.33 after introduction 0.33 M urea. Notably, two-electrode electrolyzer employing as bifunctional exhibits current density 1.35 excellent long-term durability 80 h.

Language: Английский

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Efficient Alkaline Water/Seawater Hydrogen Evolution by a Nanorod‐Nanoparticle‐Structured Ni‐MoN Catalyst with Fast Water‐Dissociation Kinetics

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(21)

Published: April 1, 2022

Achieving efficient and durable nonprecious hydrogen evolution reaction (HER) catalysts for scaling up alkaline water/seawater electrolysis is desirable but remains a significant challenge. Here, heterogeneous Ni-MoN catalyst consisting of Ni MoN nanoparticles on amorphous nanorods that can sustain large-current-density HER with outstanding performance demonstrated. The hierarchical nanorod-nanoparticle structure, along large surface area multidimensional boundaries/defects endows the abundant active sites. hydrophilic helps to achieve accelerated gas-release capabilities effective in preventing degradation during water electrolysis. Theoretical calculations further prove combination effectively modulates electron redistribution at their interface promotes sluggish water-dissociation kinetics Mo Consequently, this requires low overpotentials 61 136 mV drive current densities 100 1000 mA cm-2 , respectively, 1 m KOH stable operation 200 h constant density or 500 . This good also works well seawater electrolyte shows toward overall ultralow cell voltages.

Language: Английский

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Efficient Nitrogen Fixation to Ammonia through Integration of Plasma Oxidation with Electrocatalytic Reduction

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(25), P. 14131 - 14137

Published: April 15, 2021

Abstract Present one‐step N 2 fixation is impeded by tough activation of the N≡N bond and low selectivity to NH 3 . Here we report ‐to‐NH can be decoupled a two‐step process with one problem effectively solved in each step, including: 1) facile NO x − non‐thermal plasma technique, 2) highly selective conversion electrocatalytic reduction. Importantly, this uses air water as low‐cost raw materials for scalable ammonia production under ambient conditions. For reduction , present surface boron‐rich core–shell nickel boride electrocatalyst. The feature key boosting activity, selectivity, stability via enhanced adsorption, suppression hydrogen evolution Ni oxidation. A significant 198.3 μmol cm −2 h −1 was achieved, together nearly 100 % Faradaic efficiency.

Language: Английский

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Progress in Hydrogen Production Coupled with Electrochemical Oxidation of Small Molecules

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(51)

Published: Oct. 6, 2022

Abstract The electrochemical oxidation of small molecules to generate value‐added products has gained enormous interest in recent years because the advantages benign operation conditions, high conversion efficiency and selectivity, absence external oxidizing agents, eco‐friendliness. Coupling replace oxygen evolution reaction (OER) at anode hydrogen (HER) cathode an electrolyzer would simultaneously realize generation high‐value chemicals or pollutant degradation highly efficient production hydrogen. This Minireview presents introduction on small‐molecule choice design strategies electrocatalysts as well breakthroughs achieved Finally, challenges future orientations are highlighted.

Language: Английский

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Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(7), P. 3694 - 3812

Published: March 22, 2024

Electrocatalytic water splitting driven by renewable electricity has been recognized as a promising approach for green hydrogen production. Different from conventional strategies in developing electrocatalysts the two half-reactions of (e.g., and oxygen evolution reactions, HER OER) separately, there growing interest designing bifunctional electrocatalysts, which are able to catalyze both OER. In addition, considering high overpotentials required OER while limited value produced oxygen, is another rapidly exploring alternative oxidation reactions replace hybrid toward energy-efficient generation. This Review begins with an introduction on fundamental aspects splitting, followed thorough discussion various physicochemical characterization techniques that frequently employed probing active sites, emphasis reconstruction during redox electrolysis. The design, synthesis, performance diverse based noble metals, nonprecious metal-free nanocarbons, overall acidic alkaline electrolytes, thoroughly summarized compared. Next, their application also presented, wherein anodic include sacrificing agents oxidation, pollutants oxidative degradation, organics upgrading. Finally, concise statement current challenges future opportunities presented hope guiding endeavors quest sustainable

Language: Английский

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Engineering a local acid-like environment in alkaline medium for efficient hydrogen evolution reaction

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: April 19, 2022

Tuning the local reaction environment is an important and challenging issue for determining electrochemical performances. Herein, we propose a strategy of intentionally engineering to yield highly active catalysts. Taking Ptδ- nanoparticles supported on oxygen vacancy enriched MgO nanosheets as prototypical example, have successfully created acid-like in alkaline medium achieve excellent hydrogen evolution The evidenced by operando Raman, synchrotron radiation infrared X-ray absorption spectroscopy that observes key H3O+ intermediate emergence surface accumulation around sites during electrocatalysis. Further analysis confirms critical factors forming include: facilitates H2O dissociation generate species; F centers transfers its unpaired electrons Pt, leading formation electron-enriched positively charged migrates negatively accumulates due electrostatic attraction, thus creating acidic medium.

Language: Английский

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Rapid complete reconfiguration induced actual active species for industrial hydrogen evolution reaction

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Oct. 2, 2022

Rational regulation of electrochemical reconfiguration and exploration activity origin are important foundations for realizing the optimization electrocatalyst activity, but rather challenging. Herein, we potentially develop a rapid complete strategy heterostructures CoC2O4 coated by MXene nanosheets (CoC2O4@MXene) during hydrogen evolution reaction (HER) process. The self-assembled CoC2O4@MXene nanotubular structure has high electronic accessibility abundant electrolyte diffusion channels, which favor reconfiguration. Such creates new actual catalytic active species Co(OH)2 transformed from CoC2O4, is coupled with to facilitate charge transfer decrease free energy Volmer step toward fast HER kinetics. reconfigured components require low overpotentials 28 216 mV at 10 1000 mA cm-2 in alkaline conditions decent stability natural seawater. This work gives insights understanding formation opens up way high-performance electrocatalysts.

Language: Английский

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Electrocatalytic Water Splitting: From Harsh and Mild Conditions to Natural Seawater

Small, Journal Year: 2021, Volume and Issue: 18(11)

Published: Dec. 8, 2021

Electrocatalytic water splitting is regarded as the most effective pathway to generate green energy-hydrogen-which considered one of promising clean energy solutions world's crisis and climate change mitigation. Although electrocatalytic has been proposed for decades, large-scale industrial hydrogen production hindered by high electricity cost, capital investment, electrolysis media. Harsh conditions (strong acid/alkaline) are widely used in mechanism studies, excellent catalytic activities efficiencies have achieved. However, practical application harsh encounters several obstacles, such corrosion issues, catalyst stability, membrane technical difficulties. Thus, research on mild (neutral/near neutral), even natural seawater, aroused increasing attention. or seawater not clear. Herein, different reviewed effects mechanisms three summarized. Then, a comparison reaction process ions electrolytes presented. Finally, challenges opportunities associated with direct perspective presented promote progress splitting.

Language: Английский

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