Rh-engineered ultrathin NiFe-LDH nanosheets enable highly-efficient overall water splitting and urea electrolysis

Applied Catalysis B Environment and Energy, Год журнала: 2020, Номер 284, С. 119740 - 119740

Опубликована: Ноя. 24, 2020

Язык: Английский

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Bimetal Schottky Heterojunction Boosting Energy‐Saving Hydrogen Production from Alkaline Water via Urea Electrocatalysis

Advanced Functional Materials, Год журнала: 2020, Номер 30(21)

Опубликована: Фев. 27, 2020

Abstract Hydrogen production via water electrocatalysis is limited by the sluggish anodic oxygen evolution reaction (OER) that requires a high overpotential. In response, urea‐assisted energy‐saving alkaline hydrogen‐production system has been investigated replacing OER with more oxidizable urea oxidation (UOR). A bimetal heterostructure CoMn/CoMn 2 O 4 as bifunctional catalyst constructed in an for both and hydrogen (HER). Based on Schottky heterojunction structure, induces self‐driven charge transfer at interface, which facilitates absorption of reactant molecules fracture chemical bonds, therefore triggering decomposition urea. As result, heterostructured electrode exhibits ultralow potentials −0.069 1.32 V (vs reversible electrode) to reach 10 mA cm −2 HER UOR, respectively, solution, full electrolysis driven delivers relatively low potential 1.51 performs stably than 15 h. This represents novel strategy Mott–Schottky hybrids electrocatalysts should inspire development sustainable energy conversion combining sewage treatment.

Язык: Английский

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Local Charge Distribution Engineered by Schottky Heterojunctions toward Urea Electrolysis

Advanced Energy Materials, Год журнала: 2018, Номер 8(27)

Опубликована: Авг. 8, 2018

Abstract Urea electrooxidation with favorable thermodynamic potential offers great promise for decoupling H 2 /O evolution from sluggish water splitting, and simultaneously mitigating the problem of urea‐rich pollution. However, intrinsically slow kinetics six‐electron transfer process impels one to explore efficient catalysts in order enable widespread use this catalytic system. In response, taking CoS /MoS Schottky heterojunctions as proof‐of‐concept paradigm, a model modulate surface charge distribution synergistically facilitating adsorption fracture chemical group urea molecule is proposed mechanism at molecular level elucidated. Based on density functional calculations, self‐driven across heterointerface would induce formation local electrophilic/nucleophilic region, which will intelligently adsorb electron‐donating/electron‐withdrawing groups molecule, activate bonds, thus trigger decomposition urea. Benefiting regulation distribution, constructed catalyst ‐MoS exhibits superior activities 1.29 V (only 0.06 higher than voltage decomposition) attain 10 mA cm −2 well robust durability over 60 h. This innovational manipulation via heterojunction provides exploring other highly electrocatalysts.

Язык: Английский

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Copper–Nickel Nitride Nanosheets as Efficient Bifunctional Catalysts for Hydrazine‐Assisted Electrolytic Hydrogen Production

Advanced Energy Materials, Год журнала: 2019, Номер 9(21)

Опубликована: Апрель 10, 2019

Abstract Electrocatalytic water splitting is one of the sustainable and promising strategies to generate hydrogen fuel but still remains a great challenge because sluggish anodic oxygen evolution reaction (OER). A very effective approach dramatically decrease input cell voltage electrolysis replace OER with hydrazine oxidation (HzOR) due its lower thermodynamic potential. Therefore, developing low‐cost efficient HzOR catalysts, coupled cathodic (HER), tremendously important for energy‐saving electrolytic production. Herein, new‐type copper–nickel nitride (Cu 1 Ni 2 ‐N) rich Cu 4 N/Ni 3 N interface rationally constructed on carbon fiber cloth. The 3D electrode exhibits extraordinary HER performance an overpotential 71.4 mV at 10 mA cm −2 in 1.0 m KOH, simultaneously delivering ultralow potential 0.5 KOH/0.5 electrolyte. Moreover, utilizing synthesized ‐N as both cathode anode display 0.24 V excellent stability over 75 h. present work develops copper–nickel‐based bifunctional electrocatalyst through hydrazine‐assistance

Язык: Английский

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Layered and two dimensional metal oxides for electrochemical energy conversion

Energy & Environmental Science, Год журнала: 2018, Номер 12(1), С. 41 - 58

Опубликована: Окт. 17, 2018

The oxygen evolution and reduction reactions are two extremely important in terms of energy applications.

Язык: Английский

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Manipulating dehydrogenation kinetics through dual-doping Co3N electrode enables highly efficient hydrazine oxidation assisting self-powered H2 production

Nature Communications, Год журнала: 2020, Номер 11(1)

Опубликована: Апрель 15, 2020

Abstract Replacing sluggish oxygen evolution reaction (OER) with hydrazine oxidation (HzOR) to produce hydrogen has been considered as a more energy-efficient strategy than water splitting. However, the relatively high cell voltage in two-electrode system and required external electric power hinder its scalable applications, especially mobile devices. Herein, we report bifunctional P, W co-doped Co 3 N nanowire array electrode remarkable catalytic activity towards both HzOR (−55 mV at 10 mA cm −2 ) (HER, −41 ). Inspiringly, record low of 28 is achieve system. DFT calculations decipher that doping optimized H* adsorption/desorption dehydrogenation kinetics could be underlying mechanism. Importantly, self-powered H 2 production by integrating direct fuel splitting electrolyzer can decent rate 1.25 mmol h −1 room temperature.

Язык: Английский

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Electrochemical oxidation of biomass derived 5-hydroxymethylfurfural (HMF): pathway, mechanism, catalysts and coupling reactions

Green Chemistry, Год журнала: 2021, Номер 23(12), С. 4228 - 4254

Опубликована: Янв. 1, 2021

HMF electrooxidation is emerging as a powerful and promising method to produce wide range of high-value chemicals on account mild operation conditions, controllable selectivity, scalability.

Язык: Английский

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Oxygen‐Incorporated NiMoP Nanotube Arrays as Efficient Bifunctional Electrocatalysts For Urea‐Assisted Energy‐Saving Hydrogen Production in Alkaline Electrolyte

Advanced Functional Materials, Год журнала: 2021, Номер 31(43)

Опубликована: Июль 29, 2021

Abstract To couple hydrogen evolution reaction (HER) with urea oxidation (UOR) is a promising approach to produce H 2 reduced energy consumption. However, the development of low‐cost and high‐performance bifunctional electrocatalyst toward HER UOR still challenge. In this work, oxygen‐incorporated nickel molybdenum phosphide nanotube arrays are synthesized on foam (O‐NiMoP/NF) via electrodeposition accompanied in‐situ template etching. Benefiting from modulated electronic structure array architecture O‐NiMoP, self‐supporting O‐NiMoP/NF electrodes demonstrate highly efficient catalytic activity UOR. Particularly, in (HER||UOR) coupled system for production, significantly cell voltage 1.55 V obtained at current density 50 mA cm –2 , which about 300 mV lower than that conventional water electrolysis. Density functional theory calculations reveal remarkable activities originated Ni sites environment induced by Mo, P O atoms, facilitate dissociation during balance adsorption/desorption intermediates The Ni‐based phosphides as HER||OER provides new enabling energy‐saving production.

Язык: Английский

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Progress and Perspectives in Photo‐ and Electrochemical‐Oxidation of Biomass for Sustainable Chemicals and Hydrogen Production

Advanced Energy Materials, Год журнала: 2021, Номер 11(43)

Опубликована: Июнь 17, 2021

Abstract Biomass is recognized as an ideal CO 2 neutral, abundant, and renewable resource substitute to fossil fuels. The rich proton content in most biomass derived materials, such ethanol, 5‐hydroxymethylfurfural (HMF) glycerol allows it be effective hydrogen carrier. oxidation derivatives, 2,5‐difurandicarboxylic acid from HMF, glyceric are valuable products used biodegradable polymers pharmaceuticals. Therefore, combining biomass‐derived compound at the anode evolution reaction cathode a electrolysis or photo‐reforming reactor would present promising strategy for coproducing high value chemicals with low energy consumption emissions. This review aims combine fundamental knowledge on photo electro‐assisted catalysis provide comprehensive understanding of general mechanisms different molecule oxidation. At same time, catalyst requirements recent advances various feedstock compounds also reviewed detail. Technoeconomic assessment life cycle analysis performed feedstocks assess relative benefits processes, finally critical prospects given challenges opportunities technology development meet sustainability requirement future global economy.

Язык: Английский

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Interfacial engineering of the NiSe2/FeSe2 p-p heterojunction for promoting oxygen evolution reaction and electrocatalytic urea oxidation

Applied Catalysis B Environment and Energy, Год журнала: 2021, Номер 299, С. 120638 - 120638

Опубликована: Авг. 19, 2021

Язык: Английский

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