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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Water electrolysis for hydrogen production: from hybrid systems to self-powered/catalyzed devices

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 17(1), P. 49 - 113

Published: Nov. 7, 2023

This perspective highlights recent advancements in innovative strategies to provide valuable insights into the potential for energy-saving hydrogen production through water electrolysis.

Language: Английский

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Recent Advancements in Electrochemical Hydrogen Production via Hybrid Water Splitting

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(4)

Published: Oct. 10, 2023

Abstract As one of the most promising approaches to producing high‐purity hydrogen (H 2 ), electrochemical water splitting powered by renewable energy sources such as solar, wind, and hydroelectric power has attracted considerable interest over past decade. However, electrolysis process is seriously hampered sluggish electrode reaction kinetics, especially four‐electron oxygen evolution at anode side, which induces a high overpotential. Currently, emerging hybrid strategy proposed integrating thermodynamically favorable electro–oxidation reactions with cathode, providing new opportunity for energy–efficient H2 production. To achieve highly efficient cost–effective toward large–scale practical H production, much work been continuously done exploit alternative anodic oxidation cutting–edge electrocatalysts. This review will focus on recent developments production coupled reactions, including choice substrates, investigation electrocatalytic materials, deep understanding underlying mechanisms. Finally, some insights into scientific challenges now standing in way future advancement technique are shared, hope inspiring further innovative efforts this rapidly growing field.

Language: Английский

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Stabilizing Low‐Valence Single Atoms by Constructing Metalloid Tungsten Carbide Supports for Efficient Hydrogen Oxidation and Evolution

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(42)

Published: Sept. 2, 2023

Abstract Designing novel single‐atom catalysts (SACs) supports to modulate the electronic structure is crucial optimize catalytic activity, but rather challenging. Herein, a general strategy proposed utilize metalloid properties of trap and stabilize single‐atoms with low‐valence states. A series supported on surface tungsten carbide (M‐WC x , M=Ru, Ir, Pd) are rationally developed through facile pyrolysis method. Benefiting from WC exhibit weak coordination W C atoms, resulting in formation active centers similar metals. The unique metal‐metal interaction effectively stabilizes single atoms improves orbital energy level distribution sites. As expected, representative Ru‐WC exhibits superior mass activities 7.84 62.52 mg Ru −1 for hydrogen oxidation evolution reactions (HOR/HER), respectively. In‐depth mechanistic analysis demonstrates that an ideal dual‐sites cooperative mechanism achieves suitable adsorption balance H ad OH energetically favorable Volmer step. This work offers new guidance precise construction highly SACs.

Language: Английский

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Next-Generation Green Hydrogen: Progress and Perspective from Electricity, Catalyst to Electrolyte in Electrocatalytic Water Splitting

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: July 5, 2024

Green hydrogen from electrolysis of water has attracted widespread attention as a renewable power source. Among several production methods, it become the most promising technology. However, there is no large-scale system currently that can compete with conventional fossil fuel production. Renewable energy electrocatalytic splitting an ideal technology environmental cleanliness protection and good purity, which meet requirements future development. This review summarizes introduces current status by three aspects: electricity, catalyst electrolyte. In particular, present situation latest progress key sources power, catalytic materials electrolyzers for are introduced. Finally, problems generation electrolytic directions next-generation green in discussed outlooked. It expected this will have important impact on field water.

Language: Английский

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Pd/NiMoO4/NF electrocatalysts for the efficient and ultra-stable synthesis and electrolyte-assisted extraction of glycolate

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 4, 2024

Abstract Electrocatalytic conversion of organic small molecules is a promising technique for value-added chemical productions but suffers from high precious metal consumption, poor stability electrocatalysts and tedious product separation. Here, Pd/NiMoO 4 /NF electrocatalyst with much lowered Pd loading amount (3.5 wt.%) has been developed efficient, economic, ultra-stable glycolate synthesis, which shows Faradaic efficiency (98.9%), yield (98.8%), ultrahigh (1500 h) towards electrocatalytic ethylene glycol oxidation. Moreover, the obtained glycolic acid converted to sodium by in-situ acid-base reaction in NaOH electrolyte, atomic efficient needs no additional addition weak adsorption on catalyst surface plays significant role avoiding excessive oxidation achieving selectivity. This work may provide instructions design as well separation conversions alcohols.

Language: Английский

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Electrochemical Oxidation of Small Molecules for Energy‐Saving Hydrogen Production

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(30)

Published: May 27, 2024

Abstract Electrochemical water splitting is a promising technique for the production of high‐purity hydrogen. Substituting slow anodic oxygen evolution reaction with an oxidation that thermodynamically more favorable enables energy‐efficient Moreover, this approach facilitates degradation environmental pollutants and synthesis value‐added chemicals through rational selection small molecules as substrates. Strategies small‐molecule electrocatalyst design are critical to electrocatalytic performance, focus on achieving high current density, selectivity, Faradaic efficiency, operational durability. This perspective discusses key factors required further advancement, including technoeconomic analysis, new reactor system design, meeting requirements industrial applications, bridging gap between fundamental research practical product detection separation. aims advance development hybrid electrolysis applications.

Language: Английский

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Unlocking Efficient Hydrogen Production: Nucleophilic Oxidation Reactions Coupled with Water Splitting

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: June 10, 2024

Abstract Electrocatalytic water splitting driven by sustainable energy is a clean and promising water‐chemical fuel conversion technology for the production of high‐purity green hydrogen. However, sluggish kinetics anodic oxygen evolution reaction (OER) pose challenges large‐scale hydrogen production, limiting its efficiency safety. Recently, OER has been replaced nucleophilic oxidation (NOR) with biomass as substrate coupled (HER), which attracted great interest. Anode NOR offers faster kinetics, generates high‐value products, reduces consumption. By coupling reaction, can be enhanced while yielding products or degrading pollutants. Therefore, NOR‐coupled HER another new electrolytic strategy after significance realizing development global decarbonization. This review explores potential reactions an alternative to delves into mechanisms, guiding future research in production. It assesses different methods, analyzing pathways catalyst effects. Furthermore, it evaluates role electrolyzers industrialized discusses prospects challenges. comprehensive aims advance efficient economical

Language: Английский

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Strengthening the Synergy between Oxygen Vacancies in Electrocatalysts for Efficient Glycerol Electrooxidation

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(26)

Published: April 9, 2024

Defect-engineered bimetallic oxides exhibit high potential for the electrolysis of small organic molecules. However, ambiguity in relationship between defect density and electrocatalytic performance makes it challenging to control final products multi-step multi-electron reactions such systems. In this study, controllable kinetics reduction is used maximize oxygen vacancy a Cu─Co oxide nanosheet (CuCo

Language: Английский

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Single‐Atomic‐Site Platinum Steers Middle Hydroxyl Selective Oxidation on Amorphous/Crystalline Homojunction for Photoelectrochemical Glycerol Oxidation Coupled with Hydrogen Generation

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(26)

Published: Feb. 28, 2024

Abstract Photoelectrochemical (PEC) organic conversion is a promising approach to convert low‐cost organics value‐added chemicals, which urgently needs the development of efficient and highly selective photoanodes. Here, Pt single‐atom dispersed WO 3 amorphous/crystalline homojunction for anodic glycerol oxidation reaction (GOR) coupled with cathodic hydrogen generation reported. In photoelectrocatalytic system, novel Pt‐SA/WO x photoanode reaches photocurrent density 2.85 mA cm −2 at 1.2 V versus RHE, up 297.3 mmol m h −1 rate 60.2% dihydroxyacetone (DHA) selectivity, realizing green synthesis high‐value chemicals. The experimental data theoretical calculations reveal regulated band structure, build‐in electric field, surface charge , can improve carrier lifetime, accelerate transfer, reduce energy barrier GOR process, thus boosting PEC activity DHA selectivity. This work provides feasible plan designing atomic‐level engineering constructing on photoanodes products from biomass.

Language: Английский

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