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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Efficient Electrooxidation of 5‐Hydroxymethylfurfural Using Co‐Doped Ni₃S₂ Catalyst: Promising for H₂ Production under Industrial‐Level Current Density

Advanced Science, Год журнала: 2022, Номер 9(17)

Опубликована: Апрель 15, 2022

Abstract Replacing oxygen evolution reaction (OER) by electrooxidations of organic compounds has been considered as a promising approach to enhance the energy conversion efficiency electrolytic water splitting proces. Developing efficient electrocatalysts with low potentials and high current densities is crucial for large‐scale productions H 2 other value‐added chemicals. Herein, non‐noble metal Co‐doped Ni 3 S self‐supported on foam (NF) substrate are prepared used catalysts 5‐hydroxymethylfurfural (HMF) oxidation (HMFOR) under alkaline aqueous conditions. For HMFOR, Co 0.4 NiS@NF electode achieves an extremely onset potential 0.9 V versus reversible hydrogen electrode (RHE) records large density 497 mA cm –2 at 1.45 RHE HMFOR. During HMFOR‐assisted production, yield rates 2,5‐furandicarboxylic acid (FDCA) in 10 mL electrolyte containing × −3 M HMF 330.4 µmol h –1 1000 , respectively. The electrocatalyst displays good cycling durability toward HMFOR can be electrooxidation biomass‐derived findings present facile route based heteroatom doping fabricate high‐performance catalyses that facilitate industrial‐level production coupling conventional HER cathodic processes

Язык: Английский

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Doped Mn Enhanced NiS Electrooxidation Performance of HMF into FDCA at Industrial‐Level Current Density

Advanced Functional Materials, Год журнала: 2023, Номер 33(24)

Опубликована: Март 13, 2023

Abstract Electrooxidation of 5‐hydroxymethylfurfural (HMF) into 2,5‐furandicarboxylic acid (FDCA) is a highly promising approach for producing value‐added chemicals from biomass. However, developing efficient electrocatalysts HMF oxidation (HMFOR) with high current density in large‐scale productions remains challenge. Herein, it demonstrated that the Mn‐doped NiS nanosheet grown directly on 3D graphite felt (GF) substrates can efficiently perform electrooxidation FDCA at industrial‐level (500 mA cm −2 ) H‐cell. The Mn 0.2 NiS/GF exhibits excellent HMFOR performance selectivity (98.3%), yield (97.6%), faradaic efficiency (94.2%), and robust stability (10 cycles). Especially, production rate up to 4.56 g h −1 be achieved, superior those reported literatures. Furthermore, by scaling electrode area assembling continuous‐flow electrolyzer, 44.32 achieved. activity attributed incorporation material, theoretical calculation results indicate Ni as both adsorption sites oxidation, thereby effectively facilitate electro‐oxidation performance. This work provides strategy potential industrial‐grade large density.

Язык: Английский

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Highly Efficient Biomass Upgrading by a Ni−Cu Electrocatalyst Featuring Passivation of Water Oxidation Activity

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(37)

Опубликована: Июль 24, 2023

Abstract Electricity‐driven organo‐oxidations have shown an increasing potential recently. However, oxygen evolution reaction (OER) is the primary competitive reaction, especially under high current densities, which leads to low Faradaic efficiency (FE) of product and catalyst detachment from electrode. Here, we report a bimetallic Ni−Cu electrocatalyst supported on Ni foam (Ni−Cu/NF) passivate OER process while oxidation 5‐hydroxymethylfurfural (HMF) significantly enhanced. A density 1000 mA cm −2 can be achieved at 1.50 V vs . reversible hydrogen electrode, both FE yield keep close 100 % over wide range potentials. Both experimental results theoretical calculations reveal that Cu doping impedes OH* deprotonation O* hereby greatly passivated. Those instructive provide new approach realizing highly efficient biomass upgrading by regulating activity.

Язык: Английский

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Advances in Selective Electrochemical Oxidation of 5‐Hydroxymethylfurfural to Produce High‐Value Chemicals

Advanced Science, Год журнала: 2022, Номер 10(4)

Опубликована: Дек. 8, 2022

The conversion of biomass is a favorable alternative to the fossil energy route solve crisis and environmental pollution. As one most versatile platform compounds, 5-hydroxymethylfural (HMF) can be transformed various value-added chemicals via electrolysis combining with renewable energy. Here, recent advances in electrochemical oxidation HMF, from reaction mechanism reactor design are reviewed. First, pathway summarized systematically. Second, parameters easy ignored emphasized discussed. Then, electrocatalysts reviewed comprehensively for different products reactors introduced. Finally, future efforts on exploring mechanism, electrocatalysts, prospected. This review provides deeper understanding electrocatalyst reactor, which expected promote economical efficient industrial applications.

Язык: Английский

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S‐Species‐Evoked High‐Valence Ni^2+δ of the Evolved β‐Ni(OH)₂ Electrode for Selective Oxidation of 5‐Hydroxymethylfurfural

Advanced Materials, Год журнала: 2023, Номер 35(12)

Опубликована: Янв. 6, 2023

An efficient NiSx -modified β-Ni(OH)2 electrode is reported for the selective oxidation reaction of 5-hydroxymethylfurfural (HMFOR) with excellent electrocatalytic (HMF) selectivity (99.4%), conversion (97.7%), and Faradaic efficiency (98.3%). The decoration will evoke high-valence Ni2+δ species in reconstructed electrode, which are real active HMFOR. generated /Ni(OH)O modulates proton-coupled electron-transfer (PCET) process HMFOR, where electrocatalytically Ni(OH)O can effectively trap protons from CHO end HMF to realize electron transfer. oxygen evolution (OER) competes HMFOR when continues accumulate, generate /NiOx (OH)y intermediate. Density functional theory (DFT) calculations experimental results verify that adsorption energy be optimized through increased composition more capture electrons

Язык: Английский

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Optimizing Heterointerface of Co₂P–Co_xO_y Nanoparticles within a Porous Carbon Network for Deciphering Superior Water Splitting

Small Structures, Год журнала: 2023, Номер 4(6)

Опубликована: Янв. 4, 2023

It is of great significance to design a bifunctional electrocatalyst for promoting hydrogen (HER) and oxygen (OER) evolution reactions simultaneously. Herein, inspired by the appropriate H atom binding energy on cobalt phosphides excellent kinetics oxides, regulative synthesis Co 2 P–Co x O y (Co = CoO or 3 4 ) heterogeneous nanoparticle‐anchored porous carbon network via one‐pot heat treatment reported. The as‐synthesized /C exhibits superior electrochemical activity with low overpotentials 86 mV HER 246 OER at 10 mA cm −2 in an alkaline electrolyte. Moreover, compared commercial Pt/C || RuO system, system presents outstanding toward overall water splitting (1.55 V@10 ), which well maintained over long‐term (120 h) electrocatalysis. Density functional theory calculations show that rich interfaces between P offer synergistic effect, enables as both OER.

Язык: Английский

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The pivot to achieve high current density for biomass electrooxidation: Accelerating the reduction of Ni3+ to Ni2+

Applied Catalysis B Environment and Energy, Год журнала: 2023, Номер 330, С. 122590 - 122590

Опубликована: Март 6, 2023

Язык: Английский

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Electrocatalytic oxidation of 5‐hydroxymethylfurfural for sustainable 2,5‐furandicarboxylic acid production—From mechanism to catalysts design

SusMat, Год журнала: 2023, Номер 3(1), С. 21 - 43

Опубликована: Янв. 16, 2023

Abstract Catalytic conversion of biomass‐based platform chemicals is one the significant approaches to utilize renewable biomass resources. 2,5‐Furandicarboxylic acid (FDCA), obtained by an electrocatalytic oxidation 5‐hydroxymethylfurfural (HMF), has attracted extensive attention due potential replacing terephthalic synthesize high‐performance polymeric materials for commercialization. In present work, pH‐dependent reaction pathways and factors influencing degree functional group are first discussed. Then mechanism HMF further elucidated using representative examples. addition, emerging catalyst design strategies (defects, interface engineering) used in generalized, structure–activity relationships between abovementioned catalysts performance analyzed. Furthermore, cathode pairing reactions, such as hydrogen evolution reaction, CO 2 reduction (CO RR), oxygen thermodynamically favorable organic reactions lower cell voltage electrolysis system, Finally, challenges prospects electrochemical FDCA presented, focusing on deeply investigated mechanism, coupling reactor design, downstream product separation/purification.

Язык: Английский

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Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

Small, Год журнала: 2023, Номер 19(45)

Опубликована: Июль 11, 2023

Abstract Compared with the traditional electrolysis of water to produce hydrogen, urea‐assisted hydrogen has significant advantages and received extensive attention from researchers. Unfortunately, urea oxidation reaction (UOR) involves a complex six‐electron transfer process leading high overpotential, which forces researchers develop high‐performance UOR catalysts drive development splitting. Based on mechanism literature research, this review summarizes strategies for preparing highly efficient catalysts. First, is introduced characteristics excellent are pointed out. Aiming at this, following modulation proposed improve catalytic performance based summarizing various literature: 1) Accelerating active phase formation reduce initial potential; 2) Creating double sites trigger new mechanism; 3) adsorption promoting C─N bond cleavage ensure effective conduct UOR; 4) Promoting desorption CO 2 stability prevent catalyst poisoning; 5) electron overcome inherent slow dynamics 6) Increasing or surface area. Then, application in electrochemical devices summarized. Finally, current deficiencies future directions discussed.

Язык: Английский

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