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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Supported Ruthenium Single‐Atom and Clustered Catalysts Outperform Benchmark Pt for Alkaline Hydrogen Evolution

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(35)

Published: April 8, 2023

Guaranteeing satisfactory catalytic behavior while ensuring high metal utilization has become the problem that needs to be addressed when designing noble-metal-based catalysts for electrochemical reactions. Here, well-dispersed ruthenium (Ru) based clusters with adjacent Ru single atoms (SAs) on layered sodium cobalt oxide (Ru/NC) are demonstrated as a superb electrocatalyst alkaline HER. The Ru/NC catalyst demonstrates an activity increase by factor of two relative commercial Pt/C. Operando characterizations in conjunction density functional theory (DFT) simulations uncover origin superior and establish structure-performance relationship, is, under HER condition, real active species SAs metallic supported NC substrate. excellent can understood spatially decoupled water dissociation hydrogen desorption mechanism, where substrate accelerates rate, generated H intermediates would then migrate or recombine have H2 evolution. More importantly, comparing forms sites, it is cluster dominates activity.

Language: Английский

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Pt‐Quantum‐Dot‐Modified Sulfur‐Doped NiFe Layered Double Hydroxide for High‐Current‐Density Alkaline Water Splitting at Industrial Temperature

Advanced Materials, Journal Year: 2023, Volume and Issue: unknown, P. 2208209 - 2208209

Published: Jan. 21, 2023

Suitable electrocatalysts for industrial water splitting can veritably promote practical hydrogen applications. Rational surface design is exceptionally significant to bridge the gap between fundamental science and expectation in splitting. Here, Pt-quantum-dot-modified sulfur-doped NiFe layered double hydroxides (Pt@S-NiFe LDHs) are designed with eximious catalytic activity toward evolution reaction (HER) under condition. Benefiting from enhanced binding energy, mass transfer, release, Pt@S-NiFe LDHs exhibit outstanding HER at high current densities. Notably, it obtains an impressively low overpotential of 71 mV long-term stability 200 h 100 mA cm-2 , exceeding commercial 40% Pt/C most reported Pt-based electrocatalysts. Its 2.7 times higher than that mV. Furthermore, temperature (65 °C), electrolyzer based on LDH needs just 1.62 V reach density superior one Pt/C//IrO2 . This work provides rational ideas develop exceptional performance high-temperature

Language: Английский

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Breaking the Activity and Stability Bottlenecks of Electrocatalysts for Oxygen Evolution Reactions in Acids

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(49)

Published: Aug. 7, 2023

Oxygen evolution reaction (OER) is a cornerstone for variety of electrochemical energy conversion and storage systems such as water splitting, CO2 /N2 reduction, reversible fuel cells, metal-air batteries. However, OER catalysis in acids suffers from extra sluggish kinetics due to the additional step dissociation along with its multiple electron transfer processes. Furthermore, catalysts often suffer poor stability harsh acidic electrolytes severe dissolution/corrosion The development active stable highly demanded. Here, recent advances electrocatalysis are reviewed key strategies summarized overcome bottlenecks activity both noble-metal-based noble metal-free catalysts, including i) morphology engineering, ii) composition iii) defect engineering. Recent achievements operando characterization theoretical calculations which provide an unprecedented understanding mechanisms regarding site identification, surface reconstruction, degradation/dissolution pathways. Finally, views offered on current challenges opportunities break activity-stability relationships mechanism understanding, catalyst design, well standardized evaluation industrial applications proton exchange membrane electrolyzers beyond.

Language: Английский

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Ni₃N–CeO₂ Heterostructure Bifunctional Catalysts for Electrochemical Water Splitting

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(47)

Published: Sept. 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.

Language: Английский

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Holey MXene nanosheets intimately coupled with ultrathin Ni–Fe layered double hydroxides for boosted hydrogen and oxygen evolution reactions

Carbon, Journal Year: 2023, Volume and Issue: 212, P. 118141 - 118141

Published: May 19, 2023

Language: Английский

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Molecular Engineering of Metal–Organic Frameworks as Efficient Electrochemical Catalysts for Water Oxidation

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(22)

Published: March 13, 2023

Metal-organic framework (MOF) solids with their variable functionalities are relevant for energy conversion technologies. However, the development of electroactive and stable MOFs electrocatalysis still faces challenges. Here, a molecularly engineered MOF system featuring 2D coordination network based on mercaptan-metal links (e.g., nickel, as Ni(DMBD)-MOF) is designed. The crystal structure solved from microcrystals by continuous-rotation electron diffraction (cRED) technique. Computational results indicate metallic electronic Ni(DMBD)-MOF due to Ni-S coordination, highlighting effective design thiol ligand enhancing electroconductivity. Additionally, both experimental theoretical studies that (DMBD)-MOF offers advantages in electrocatalytic oxygen evolution reaction (OER) over non-thiol 1,4-benzene dicarboxylic acid) analog (BDC)-MOF, because it poses fewer barriers during rate-limiting *O intermediate formation step. Iron-substituted NiFe(DMBD)-MOF achieves current density 100 mA cm-2 at small overpotential 280 mV, indicating new platform efficient OER catalysis.

Language: Английский

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Nanoarchitectonics of Metallene Materials for Electrocatalysis

ACS Nano, Journal Year: 2023, Volume and Issue: 17(14), P. 13017 - 13043

Published: June 27, 2023

Controlling the synthesis of metal nanostructures is one approach for catalyst engineering and performance optimization in electrocatalysis. As an emerging class unconventional electrocatalysts, two-dimensional (2D) metallene electrocatalysts with ultrathin sheet-like morphology have gained ever-growing attention exhibited superior electrocatalysis owing to their distinctive properties originating from structural anisotropy, rich surface chemistry, efficient mass diffusion capability. Many significant advances synthetic methods electrocatalytic applications 2D metallenes been obtained recent years. Therefore, in-depth review summarizing progress developing electrochemical highly needed. Unlike most reported reviews on metallenes, this starts by introducing preparation based classification metals (e.g., noble metals, non-noble metals) instead methods. Some typical strategies preparing each kind are enumerated detail. Then, utilization applications, especially conversion reactions, including hydrogen evolution reaction, oxygen reduction fuel oxidation CO2 N2 comprehensively discussed. Finally, current challenges opportunities future research energy proposed.

Language: Английский

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Stabilizing NiFe sites by high-dispersity of nanosized and anionic Cr species toward durable seawater oxidation

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

Published: Aug. 5, 2024

Electrocatalytic H

Language: Английский

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Local hydroxyl enhancement design of NiFe sulfide electrocatalyst toward efficient oxygen evolution reaction

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 331, P. 122715 - 122715

Published: April 1, 2023

Language: Английский

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