Carbon Oxyanion Self‐Transformation on NiFe Oxalates Enables Long‐Term Ampere‐Level Current Density Seawater Oxidation

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(1)

Published: Nov. 23, 2023

Seawater electrolysis is an attractive way of making H2 in coastal areas, and NiFe-based materials are among the top options for alkaline seawater oxidation (ASO). However, ample Cl- can severely corrode catalytic sites lead to limited lifespans. Herein, we report that situ carbon oxyanion self-transformation (COST) from oxalate carbonate on a monolithic NiFe micropillar electrode allows safeguard high-valence metal reaction ASO. In situ/ex studies show spontaneous, timely, appropriate COST safeguards active against attack during ASO even at ampere-level current density (j). Our catalyst shows efficient stable performance, which requires overpotential as low 349 mV attain j 1 A cm-2 . Moreover, with protective surface CO32- exhibits slight activity degradation after 600 h under seawater. This work reports effective design concepts level self-transformation, acting momentous step toward defending seawater-to-H2 conversion systems.

Language: Английский

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Efficient bubble/precipitate traffic enables stable seawater reduction electrocatalysis at industrial-level current densities

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

Published: April 5, 2024

Abstract Seawater electroreduction is attractive for future H 2 production and intermittent energy storage, which has been hindered by aggressive Mg 2+ /Ca precipitation at cathodes consequent poor stability. Here we present a vital microscopic bubble/precipitate traffic system (MBPTS) constructing honeycomb-type 3D robust anti-precipitation seawater reduction (SR), massively/uniformly release small-sized bubbles to almost every corner of the cathode repel precipitates without break. Noticeably, optimal with built-in MBPTS not only enables state-of-the-art alkaline SR performance (1000-h stable operation –1 A cm −2 ) but also highly specialized in catalytically splitting natural into greatest ability. Low amounts after prolonged tests under large current densities reflect genuine efficacy our MBPTS. Additionally, flow-type electrolyzer based on stably functions industrially-relevant 500 mA 150 h while unwaveringly sustaining near-100% Faradic efficiency. Note that estimated price (~1.8 US$/kg H2 even cheaper than US Department Energy’s goal (2 ).

Language: Английский

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Materials Design and System Innovation for Direct and Indirect Seawater Electrolysis

ACS Nano, Journal Year: 2023, Volume and Issue: 17(22), P. 22227 - 22239

Published: Nov. 15, 2023

Green hydrogen production from renewably powered water electrolysis is considered as an ideal approach to decarbonizing the energy and industry sectors. Given high-cost supply of ultra-high-purity water, well mismatched distribution sources renewable energies, combining seawater with coastal solar/offshore wind power attracting increasing interest for large-scale green production. However, various impurities in lead corrosive toxic halides, hydroxide precipitation, physical blocking, which will significantly degrade catalysts, electrodes, membranes, thus shortening stable service life electrolyzers. To accelerate development electrolysis, it crucial widen working potential gap between oxygen evolution chlorine reactions develop flexible highly efficient purification technologies. In this review, we comprehensively discuss present challenges, research efforts, design principles direct/indirect aspects materials engineering system innovation. Further opportunities developing advanced integrated electrolyzers are highlighted both low-grade sources.

Language: Английский

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Joule heating synthesis of NiFe alloy/MoO2 and in-situ transformed (Ni,Fe)OOH/MoO2 heterostructure as effective complementary electrocatalysts for overall splitting in alkaline seawater

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 340, P. 123277 - 123277

Published: Sept. 7, 2023

Language: Английский

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Realizing efficient oxygen evolution at low overpotential via dopant-induced interfacial coupling enhancement effect

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 336, P. 122928 - 122928

Published: May 29, 2023

Language: Английский

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Recent advances of bifunctional electrocatalysts and electrolyzers for overall seawater splitting

Journal of Materials Chemistry A, Journal Year: 2023, Volume and Issue: 12(2), P. 634 - 656

Published: Dec. 2, 2023

This review summarizes advances in bifunctional electrocatalysts and electrolyzers for seawater splitting, including various catalysts ( e.g. , phosphides, chalcogenides, borides, nitrides, (oxy)hydroxides) membrane-based/membrane-less systems.

Language: Английский

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In Situ Assembly of a Superaerophobic CoMn/CuNiP Heterostructure as a Trifunctional Electrocatalyst for Ampere-Level Current Density Urea-Assisted Hydrogen Production

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(7), P. 8717 - 8732

Published: Feb. 7, 2024

Urea electrolysis is a promising energy-efficient hydrogen production process with environmental benefits, but the lack of efficient and sustainable ampere-level current density electrocatalysts fabricated through simple methods major challenge for commercialization. Herein, we present an stable heterostructure electrocatalyst full urea water in convenient time-efficient preparation manner. Overall, superhydrophilic/superaerophobic CoMn/CuNiP/NF exhibits exceptional performance evolution reaction (HER) (-33.8, -184.4, -234.8 mV at -10, -500, -1000 mA cm

Language: Английский

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Interfacial engineering of Ni–Co–Mn@Ni nanosheet–nanocone arrays as high performance non-noble metal electrocatalysts for hydrogen generation

Nanoscale, Journal Year: 2024, Volume and Issue: 16(22), P. 10853 - 10863

Published: Jan. 1, 2024

The electrochemical hydrogen production from water splitting is a promising strategy for obtaining new energy sources and replacing fossil fuels. In this study, nickel nanocones were first deposited on foam substrate using direct current method. Then, nickel-cobalt-manganese ternary alloy with nanosheet morphology was the cyclic voltammetry method different cycles sweep rates. results show that sample synthesized in 3 rate of 10 mV s

Language: Английский

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Hierarchical Crystalline/Amorphous Heterostructure MoNi/NiMoO_x for Electrochemical Hydrogen Evolution with Industry‐Level Activity and Stability

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(41)

Published: Aug. 27, 2023

Abstract The design of cheap, efficient, and durable electrocatalysts for high‐throughput H 2 production is critical to give impetus hydrogen from fundamental practical industrial applications. Here, a hierarchical heterostructure evolution reaction (HER) electrocatalyst (MoNi/NiMoO x ) with 0D MoNi nanoalloys nanoparticles embedded on well‐assembled 1D porous NiMoO microrods in situ grown 3D nickel foam (NF) successfully constructed. synergetic effect different building units the unique structure endows MoNi/NiMoO composites highly active heterogeneous interface low water dissociation energy (Δ G diss = −1.2 eV) optimized adsorption ability H* −0.01 eV), fast electron/mass transport, strong catalyst‐support binding force. As result, optimal exhibits an ampere‐level current density 1.9 A cm −2 at ultralow overpotential 139 mV 1.0 м KOH 289 PBS solution, respectively. Particularly, scaled‐up electrodes 10 × membrane electrode assembly (MEA) electrolyzer reach high rate 12.12 L h −1 (12.12 times than that commercial NF) exhibit ultralong stability 1600 h, verifying its huge potential production.

Language: Английский

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Leveraging phosphate group in Pd/PdO decorated nickel phosphate microflowers via pulsed laser for robust hydrogen production in hydrazine-assisted electrolyzer

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 57, P. 176 - 186

Published: Jan. 8, 2024

Language: Английский

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