Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Chemical Reviews, Год журнала: 2024, Номер 124(7), С. 3694 - 3812

Опубликована: Март 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

Язык: Английский

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A corrosion-resistant RuMoNi catalyst for efficient and long-lasting seawater oxidation and anion exchange membrane electrolyzer

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Июнь 17, 2023

Direct seawater electrolysis is promising for sustainable hydrogen gas (H2) production. However, the chloride ions in lead to side reactions and corrosion, which result a low efficiency poor stability of electrocatalyst hinder use technology. Here we report corrosion-resistant RuMoNi electrocatalyst, situ-formed molybdate on its surface repel ions. The works stably over 3000 h at high current density 500 mA cm-2 alkaline electrolytes. Using catalyst an anion exchange membrane electrolyzer, energy conversion 77.9% 1000 1.72 V. calculated price per gallon gasoline equivalent (GGE) H2 produced $ 0.85, lower than 2026 technical target 2.0/GGE set by United Stated Department Energy, thus, suggesting practicability

Язык: Английский

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Ce‐Induced Differentiated Regulation of Co Sites via Gradient Orbital Coupling for Bifunctional Water‐Splitting Reactions

Advanced Energy Materials, Год журнала: 2023, Номер 13(30)

Опубликована: Июнь 22, 2023

Abstract Rare‐earth (RE) elements have emerged as crucial promoters to regulate the electrocatalysis of transition metals (TM), but knowledge about RE‐enhanced mechanism TM in is limited. Herein, an array‐like Ce‐CoP catalyst constructed explore origin and distinction Ce‐induced enhanced Co sites both hydrogen evolution reaction (HER) oxygen (OER). Compared with individual CoP, developed exhibits superior bifunctional electrocatalytic activity overpotentials 81 240 mV at 10 mA cm −2 , respectively for HER OER, excellent stability. Theoretical calculations show that unique 4 f valence electron structure Ce endows differentiated regulation OER through f‐p‐d gradient orbital coupling. In HER, retained Ce‐4 state induces spin parallelism surrounding sites, promoting adsorption *H intermediates. While band acts sacrificing protect from overoxidation Ce‐O‐Co chain optimized Co‐3 d state, providing additional coupling These findings provide new insights into comprehending present valuable design guidelines development efficient multi‐functional electrocatalysts.

Язык: Английский

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Dual-doping NiMoO4 with multi-channel structure enable urea-assisted energy-saving H2 production at large current density in alkaline seawater

Applied Catalysis B Environment and Energy, Год журнала: 2022, Номер 320, С. 121977 - 121977

Опубликована: Сен. 13, 2022

Язык: Английский

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Electrocatalytic seawater splitting: Nice designs, advanced strategies, challenges and perspectives

Materials Today, Год журнала: 2023, Номер 69, С. 193 - 235

Опубликована: Сен. 19, 2023

Язык: Английский

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Lamella-heterostructured nanoporous bimetallic iron-cobalt alloy/oxyhydroxide and cerium oxynitride electrodes as stable catalysts for oxygen evolution

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Март 31, 2023

Developing robust nonprecious-metal electrocatalysts with high activity towards sluggish oxygen-evolution reaction is paramount for large-scale hydrogen production via electrochemical water splitting. Here we report that self-supported laminate composite electrodes composed of alternating nanoporous bimetallic iron-cobalt alloy/oxyhydroxide and cerium oxynitride (FeCo/CeO2-xNx) heterolamellas hold great promise as highly efficient alkaline reaction. By virtue three-dimensional architecture to offer abundant accessible electroactive CoFeOOH/CeO2-xNx heterostructure interfaces through facilitating electron transfer mass transport, FeCo/CeO2-xNx exhibit superior electrocatalysis in 1 M KOH, ultralow Tafel slope ~33 mV dec-1. At overpotential low 360 mV, they reach >3900 mA cm-2 retain exceptional stability at ~1900 >1000 h, outperforming commercial RuO2 some representative oxygen-evolution-reaction catalysts recently reported. These properties make them attractive candidates electrolysis generation.

Язык: Английский

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

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Апрель 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 ).

Язык: Английский

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Ni₃N–CeO₂ Heterostructure Bifunctional Catalysts for Electrochemical Water Splitting

Advanced Functional Materials, Год журнала: 2023, Номер 33(47)

Опубликована: Сен. 3, 2023

Abstract Developing low‐cost and high‐efficient bifunctional catalysts for hydrogen evolution reaction (HER) oxygen (OER) is greatly significant water electrolysis. Here, Ni 3 N‐CeO 2 /NF heterostructure synthesized on the nickel foam, it exhibits excellent HER OER performance. As a result, electrolyzer based catalyst only needs 1.515 V@10 mA cm −2 , significantly better than that of Pt/C||IrO catalysts. In situ characterizations unveil CeO plays completely different roles in processes. infrared spectroscopy density functional theory calculations indicate introduction can optimizes structure interface water, synergistic effect N improve activity significantly, while Raman spectra reveal accelerates reconstruction O V (oxygen vacancy)‐rich NiOOH boosting OER. This study clearly unlocks catalytic mechanisms splitting, which provides useful guidance designing high‐performance splitting.

Язык: Английский

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Boosting Oxygen Evolution Reaction of (Fe,Ni)OOH via Defect Engineering for Anion Exchange Membrane Water Electrolysis Under Industrial Conditions

Advanced Materials, Год журнала: 2023, Номер 35(44)

Опубликована: Авг. 22, 2023

Developing non-precious catalysts with long-term catalytic durability and structural stability under industrial conditions is the key to practical alkaline anion exchange membrane (AEM) water electrolysis. Here, an energy-saving approach proposed synthesize defect-rich iron nickel oxyhydroxide for efficiency toward oxygen evolution reaction. Benefiting from in situ cation exchange, nanosheet-nanoflake-structured catalyst homogeneously embedded in, tightly bonded to, its substrate, making it ultrastable at high current densities. Experimental theoretical calculation results reveal that introduction of Ni FeOOH reduces activation energy barrier reaction purposely created defects not only ensure exposure active sites maximize effective surface but also modulate local coordination environment chemisorption properties both Fe sites, thus lowering *O *OOH. Consequently, optimized d-(Fe,Ni)OOH exhibits outstanding activity laboratory conditions. The large-area d-(Fe,Ni)OOH||NiMoN pair requires 1.795 V reach a density 500 mA cm-2 absolute 12.5 A AEM electrolyzer overall electrolysis, showing great potential

Язык: Английский

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Surface reconstruction and directed electron transport in NiSe2/MoSe2 Mott-Schottky heterojunction catalysts promote urea-assisted water splitting

Applied Catalysis B Environment and Energy, Год журнала: 2023, Номер 341, С. 123312 - 123312

Опубликована: Сен. 20, 2023

Язык: Английский

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