Water electrolysis for hydrogen production: from hybrid systems to self-powered/catalyzed devices

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 17(1), P. 49 - 113

Published: Nov. 7, 2023

This perspective highlights recent advancements in innovative strategies to provide valuable insights into the potential for energy-saving hydrogen production through water electrolysis.

Language: Английский

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Modulating the electronic structure of Ni(OH)₂ by coupling with low-content Pt for boosting the urea oxidation reaction enables significantly promoted energy-saving hydrogen production

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(5), P. 1984 - 1996

Published: Jan. 1, 2024

A urea-assisted water splitting electrolyzer based on Pt nanoparticle-anchored Ni(OH) 2 @Ni-CNF catalyst and Pt@Ni-CNF is constructed for effectively reducing the energy consumption of H production.

Language: Английский

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Transition Metal‐Based Catalysts for Urea Oxidation Reaction (UOR): Catalyst Design Strategies, Applications, and Future Perspectives

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(18)

Published: Jan. 21, 2024

Abstract Urea oxidation reaction (UOR) has garnered significant attention in recent years as a promising and sustainable clean‐energy technology. Urea‐containing wastewater poses severe threats to the environment human health. Numerous studies hence focus on developing UOR viable process for simultaneously remediating converting it into energy. Moreover, UOR, which thermodynamic potential of 0.37 V (vs reversible hydrogen electrode, RHE), shows great promise replacing energy‐intensive oxygen evolution (OER; 1.23 vs RHE). The versatility stability urea, particularly at ambient temperatures, make an attractive alternative fuel cells. Since entails complex intermediate adsorption/desorption process, many are devoted designing cost‐effective efficient catalysts. Notably, transition metal‐based materials with regulated d orbitals have demonstrated process. However, comprehensive reviews focusing catalysts remain scarce. In light this, review aims bridge gap by offering in‐depth systematic overview cutting‐edge design strategies their diverse applications UOR. Additionally, delves status quo future directions, charting course further advancements this exciting field.

Language: Английский

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Regulating the Band Structure of Ni Active Sites in Few‐Layered Nife‐LDH by In Situ Adsorbed Borate for Ampere‐Level Oxygen Evolution

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(12)

Published: Dec. 6, 2023

Abstract Realizing rapid transformation of hydroxide to high‐active oxyhydroxide species in layered double (LDH) catalyst plays a significant role enhancing its activity toward oxygen evolution reaction (OER) for hydrogen production from water. Here, scalable strategy is developed synthesize defect‐rich few‐layered NiFe‐LDH nanosheets (f‐NiFe‐LDH‐B) with situ borate modified boosted and stable OER due that the can narrow bandgap Ni sites realize more conductive electronic structure. Besides, adsorbed tune d band center promote facilitate adsorption intermediates. The f‐NiFe‐LDH‐B catalyst, therefore, requires only 209 249 mV overpotential deliver 10 100 mA cm −2 OER, respectively, Tafel slope 43.5 dec −1 . Moreover, 1.8 V cell voltage required reach Ampere‐level overall water splitting 500 h at room temperature.

Language: Английский

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Oxygen Vacancies‐Rich Metal Oxide for Electrocatalytic Nitrogen Cycle

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 14(1)

Published: Nov. 13, 2023

Abstract The development of industry and agriculture has been accompanied by an artificially imbalanced nitrogen cycle, which threatens human health ecological environments. Electrocatalytic systems have emerged as a sustainable way converting nitrogen‐containing molecules into high value‐added chemicals. However, the construction high‐performance electrocatalysts remains challenging. oxygen vacancy engineering strategy promoted more research efforts to explore structure‐activity relationship between catalytic activity vacancies. This review systematically summarizes recent vacancies‐rich metal oxides for electro‐catalyzing cycling systems, involving electrocatalytic nitrate reduction reaction, nitric oxide C─N coupling, urea oxidation reaction. First, methods characterization vacancies are summarized. Then, effect on is discussed in terms regulating electronic structures electrocatalysts, improving electroconductivity catalysts, lowing energy barrier, strengthening adsorption activation intermediate species. Finally, future directions cycle anticipated.

Language: Английский

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Ultrafast Room‐Temperature Synthesis of Large‐Scale, Low‐Cost, and Highly Active Ni─Fe Based Electrodes toward Industrialized Seawater Oxidation

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(39)

Published: Sept. 3, 2023

Abstract It is of significance to develop an active, efficient electrocatalyst for the oxygen evolution reaction (OER) as this determines efficiency and cost water/seawater electrolysis. Here, a cost‐effective Ni─Fe hydroxide promising OER catalyst developed by 1 min ultrafast method. The shows low overpotentials 240 254 mV at 10 mA cm −2 in both m KOH alkaline seawater, respectively. also exhibits excellent electrochemical stability. In situ Raman spectra other physical characterizations prove incorporation Fe transformation Ni(Fe)(OH) 2 Ni(Fe)OOH are responsible enhancement performance. Furthermore, can be readily scaled up synthesized within min. with size 2000 still remains electrochemically uniform. electrolysis cell integrated anode commercialized porous NiMo foam cathode has demonstrated current density 200 2.3 2.9 V 6 seawater 60 °C, Therefore, synthesized, earth‐abundant scalable, economical, highly active OER, which industrial splitting applications.

Language: Английский

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

Small, Journal Year: 2023, Volume and Issue: 19(45)

Published: July 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.

Language: Английский

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Active Site Tailoring of Ni‐Based Coordination Polymers for High‐Efficiency Dual‐Functional HER and UOR Catalysis

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(3)

Published: Oct. 11, 2023

Abstract Ni‐based electrocatalysts are regarded as highly promising ones for urea‐assisted electrolytic water hydrogen production technology. However, during the urea oxidation reaction (UOR) process, their activity is significantly constrained by unavoidable Ni species self‐oxidation reaction, and harmful liquid‐phase products (NO x − ) generated from over‐oxidize also often neglected. Herein, A self‐supported W‐doped Ni‐C 3 S N ‐based coordination polymer electrode (W‐NT@NF) with tailored 3+ active sites using ligand anchoring high‐valence metal doping strategies synthesized, which certified that this pyrolysis‐free catalyst achieves dual‐functional evolution (HER) UOR performance comparable to reported noble metal/non‐noble catalysts, both achieving high current densities approaching 1000 mA cm −2 . Density functional theory (DFT) calculations, combined spectroscopic characterizations record dynamic of oxygen (OER) processes, reveal novel energetically favorable pathway proposed, initiates directly without involve participation reconstructed NiOOH resulting OER. combination in‐line gas chromatography, ion chromatography analysis indicates Faradaic efficiency (FE) 2 higher (34%) at lower (<100 ), FE NO remains below 20% in long‐term electrolysis.

Language: Английский

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Oxygen Vacancies Alter Methanol Oxidation Pathways on NiOOH

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(7), P. 4830 - 4841

Published: Feb. 12, 2024

A thorough comprehension of the mechanism underlying methanol oxidation reaction (MOR) on Ni-based catalysts is critical for future electrocatalytic design and development. However, MOR these materials remains a matter controversy. Herein, we combine in situ surface-enhanced infrared absorption spectroscopy (SEIRAS) density functional theory (DFT) calculations to identify active sites determine monometallic alkaline media. The SEIRAS results show that formate (bi)carbonate are formed after commencement with potential-dependent relative distributions. These spectroscopic good agreement DFT-computed profiles over an oxygen vacancy, suggesting mainly proceeds through formate-involving pathway, which early consumption yields as major product, while increasing potential drives further (bi)carbonate. We also find parallel pathway generation at high potentials bypasses formation formate. two main pathways thermodynamically more feasible than one predominantly reported literature NiOOH involves CHO and/or CO key intermediates. DFT supported by evidence showing no band associated or can be detected SEIRAS, attributed nature vacancies sites, suppressing deep dehydrogenation CH2O CHO. This work thus shows promising role defect engineering promoting activity selectivity.

Language: Английский

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Unlocking Efficient Hydrogen Production: Nucleophilic Oxidation Reactions Coupled with Water Splitting

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: June 10, 2024

Abstract Electrocatalytic water splitting driven by sustainable energy is a clean and promising water‐chemical fuel conversion technology for the production of high‐purity green hydrogen. However, sluggish kinetics anodic oxygen evolution reaction (OER) pose challenges large‐scale hydrogen production, limiting its efficiency safety. Recently, OER has been replaced nucleophilic oxidation (NOR) with biomass as substrate coupled (HER), which attracted great interest. Anode NOR offers faster kinetics, generates high‐value products, reduces consumption. By coupling reaction, can be enhanced while yielding products or degrading pollutants. Therefore, NOR‐coupled HER another new electrolytic strategy after significance realizing development global decarbonization. This review explores potential reactions an alternative to delves into mechanisms, guiding future research in production. It assesses different methods, analyzing pathways catalyst effects. Furthermore, it evaluates role electrolyzers industrialized discusses prospects challenges. comprehensive aims advance efficient economical

Language: Английский

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