Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

Chemical Society Reviews, Journal Year: 2022, Volume and Issue: 51(11), P. 4583 - 4762

Published: Jan. 1, 2022

Replacing fossil fuels with energy sources and carriers that are sustainable, environmentally benign, affordable is amongst the most pressing challenges for future socio-economic development.

Language: Английский

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Stability challenges of electrocatalytic oxygen evolution reaction: From mechanistic understanding to reactor design

Joule, Journal Year: 2021, Volume and Issue: 5(7), P. 1704 - 1731

Published: June 16, 2021

Language: Английский

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Energy-saving hydrogen production by chlorine-free hybrid seawater splitting coupling hydrazine degradation

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: July 7, 2021

Abstract Seawater electrolysis represents a potential solution to grid-scale production of carbon-neutral hydrogen energy without reliance on freshwater. However, it is challenged by high costs and detrimental chlorine chemistry in complex chemical environments. Here we demonstrate chlorine-free hybrid seawater splitting coupling hydrazine degradation. It yields at rate 9.2 mol h –1 g cat NiCo/MXene-based electrodes with low electricity expense 2.75 kWh per m 3 H 2 500 mA cm –2 48% lower equivalent input relative commercial alkaline water electrolysis. Chlorine electrochemistry avoided cell voltages anode protection regardless Cl – crossover. This electrolyzer meanwhile enables fast degradation ~3 ppb residual. Self-powered realized integrating low-voltage direct fuel cells or solar cells. These findings enable further opportunities for efficient conversion ocean resources while removing harmful pollutants.

Language: Английский

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Self‐Supported Electrocatalysts for Practical Water Electrolysis

Advanced Energy Materials, Journal Year: 2021, Volume and Issue: 11(39)

Published: Sept. 1, 2021

Abstract Over the years, significant advances have been made to boost efficiency of water splitting by carefully designing economic electrocatalysts with augmented conductivity, more accessible active sites, and high intrinsic activity in laboratory test conditions. However, it remains a challenge develop earth‐abundant catalysts that can satisfy demands practical electrolysis, is, outstanding all‐pH electrolyte capacity, direct seawater ability, exceptional performance for overall splitting, superior large‐current‐density activity, robust long‐term durability. In this context, considering features increased species loading, rapid charge, mass transfer, strong affinity between catalytic components substrates, easily‐controlled wettability, as well as, enhanced bifunctional performance, self‐supported are presently projected be most suitable contenders massive scale hydrogen generation. review, comprehensive introduction design fabrication an emphasis on deposited nanostructured catalysts, selection various methods provided. Thereafter, recent development promising applications is reviewed from aforementioned aspects. Finally, brief conclusion delivered challenges perspectives relating promotion sustainable large‐scale production discussed.

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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Benzoate anions-intercalated NiFe-layered double hydroxide nanosheet array with enhanced stability for electrochemical seawater oxidation

Deleted Journal, Journal Year: 2022, Volume and Issue: 1, P. e9120028 - e9120028

Published: Aug. 12, 2022

Seawater electrolysis is an extremely attractive approach for harvesting clean hydrogen energy, but detrimental chlorine species (i.e., chloride and hypochlorite) cause severe corrosion at the anode. Here, we report our recent finding that benzoate anions-intercalated NiFe-layered double hydroxide nanosheet on carbon cloth (BZ-NiFe-LDH/CC) behaves as a highly efficient durable monolithic catalyst alkaline seawater oxidation, affords enlarged interlayer spacing of LDH, inhibits (electro)chemistry, alleviates local pH drop electrode. It only needs overpotential 320 mV to reach current density 500 mA·cm^–2 in 1 M KOH. In contrast fast activity decay NiFe-LDH/CC counterpart during long-term electrolysis, BZ-NiFe-LDH/CC achieves stable 100-h industrial-level seawater. Operando Raman spectroscopy studies further identify structural changes disordered δ (Ni^III-O) oxidation process.

Language: Английский

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Direct seawater electrolysis by adjusting the local reaction environment of a catalyst

Nature Energy, Journal Year: 2023, Volume and Issue: unknown

Published: Jan. 30, 2023

Language: Английский

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Synergetic Metal Defect and Surface Chemical Reconstruction into NiCo₂S₄/ZnS Heterojunction to Achieve Outstanding Oxygen Evolution Performance

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(35), P. 19435 - 19441

Published: June 21, 2021

Abstract Defect and interface engineering are recognized as effective strategies to regulate electronic structure improve activity of metal sulfide. However, the practical application sulfide is restricted by their low conductivity rapid decline in derived from large volume fluctuation during electrocatalysis process. More importantly, determination exact active site complicated due inevitable electrochemical reconstruction. Herein, ZnS nanoparticles with Zn defect anchored onto surface NiCo 2 S 4 nanosheet construct /ZnS hybrids, which exhibit outstanding oxygen evolution performance an ultralow overpotential 140 mV. The anchoring defective inhibit expansion cycling Density‐functional theory reveals that build‐in interfacial potential can facilitate thermodynamic formation *O *OOH, thus intrinsic activity.

Language: Английский

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Unveiling Role of Sulfate Ion in Nickel‐Iron (oxy)Hydroxide with Enhanced Oxygen‐Evolving Performance

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(38)

Published: July 2, 2021

Abstract The rational design of effective catalysts for sluggish oxygen evolution reactions (OERs) is desired but challenging. Nickel‐iron (NiFe) (oxy)hydroxides are promising pre‐electrocatalysts alkaline OER. However, OER performances limited by the slow reconstruction process to generate active species high‐valance NiFe oxyhydroxides. In this work, a sulfate ion (SO 4 2− ) modulated strategy developed boost activity (oxy)hydroxide accelerating electrochemical pre‐catalyst and stabilizing reaction intermediate OOH* during SO decorated catalyst (NF‐S0.15) fabricated via scalable anodization foam in thiourea‐dissolved electrolyte. experimental theoretical investigations demonstrate dual effect on improving performances. leaching favorable form NiFeOOH under condition. Simultaneously, residual adsorbed surface can stabilize OOH*, thus enhance As expected, NF‐S0.15 delivers an ultralow overpotential 234 mV reach current density 50 mA cm −2 , fast kinetics (27.7 dec −1 ), high stability more than 100 h. This unique insights into anionic modification could inspire development advanced electrocatalysts efficient

Language: Английский

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Hydrogen Generation from Seawater Electrolysis over a Sandwich-like NiCoN|Ni_xP|NiCoN Microsheet Array Catalyst

ACS Energy Letters, Journal Year: 2020, Volume and Issue: 5(8), P. 2681 - 2689

Published: July 28, 2020

Seawater electrolysis presents a transformative technology for sustainable hydrogen production and environmental remediation. However, the lack of active robust evolution reaction (HER) catalysts severely impedes development this technology. Here, we report sandwich-like nanostructured HER catalyst constructed by decorating both sides nickel phosphide (NixP) microsheet arrays with cobalt nitride (NiCoN) nanoparticles. The resulting integrated hierarchical (NiCoN|NixP|NiCoN) simultaneously provides large surface area abundant sites, improved intrinsic activity every site, high electrical conductivity efficient charge transfer. Consequently, NiCoN|NixP|NiCoN electrode exhibits very good activity, requiring small overpotential 165 mV to achieve current density 10 mA cm–2 in natural seawater electrolyte, along impressive stability benefiting from chlorine-corrosion resistance inner NixP arrays. Our work paves new route toward design nonprecious generation electrolysis.

Language: Английский

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