Bimetal Catalysts: Bimetal Schottky Heterojunction Boosting Energy‐Saving Hydrogen Production from Alkaline Water via Urea Electrocatalysis (Adv. Funct. Mater. 21/2020)

Wang, Chao; Lu, Haoliang; Mao, Zeyang; Yan, Chenglin; Shen, Guozhen; Wang, Xianfu

doi:10.1002/adfm.202070136

Cited by 35 publications

(49 citation statements)

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“…As a result, our catalyst possesses electrophilic Ni domain and nucleophilic NiO domain, respectively. Therefore, electron‐donating amino group and electron‐withdrawing carbonyl group in urea molecules can be selectively adsorbed on the above electrophilic and nucleophilic domains in Figure d . As a result, the C−N bond cleavage became favorable, and urea oxidation could proceed at lower potential.…”

Section: Resultsmentioning

confidence: 99%

“…found that CoS 2 /MoS 2 Schottky heterojunctions was able to yield the current density of 10 mA/cm 2 at 1.29 V for UOR . Wang's group developed a bimetal Schottky heterostructure CoMn/CoMn 2 O 4 , which possessed self‐driven charge transfer at the heterointerface, and exhibited potential of 1.32 V to reach 10 mA/cm 2 for UOR . In brief, the existence of the Schottky heterointerface will effectively modulate the electronic structure of materials, favoring the UOR process.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Zhang

et al. 2020

ChemSusChem

114

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H 2 production via electrocatalytic water splitting is greatly hindered by the sluggish oxygen evolution reaction (OER). The urea oxidation reaction (UOR) draws specific attention not only because of its lower theoretical voltage of 0.37 V compared with OER (1.23 V), but also for treating sewage water. Herein, Ni/NiO nanosheets with an ultrathin N-doped C layer containing a Schottky Ni and NiO heterointerface is constructed. Because of the self-driven charge redistribution at the heterointerface, janus charge domains are successfully created to drive the cleavage of urea molecules. Meanwhile, the synergistic effect between N-doped C and Ni/NiO restrains the deactivation of active sites in alkaline solution. The catalyst displays 1.35 V for UOR at 10 mA/cm 2 , 0.27 V lower than that of OER. The final potential increase is only 2 mV after long-term stability test of 12 h for UOR, much smaller than the uncoated sample (38 mV). The present work shows that C-coated transition metal nanomaterials with oxygen vacancies and a Schottky heterointerface are promising candidates for simultaneously boosting UOR with both high activity and long-term stability.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Zhang

et al. 2020

ChemSusChem

114

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“…[ 34–36 ] More particularly, the integration of metal and semiconductor with different energy structures such as Mott–Schottky heterojunctions could spontaneously drive electrons to flow across the metal–semiconductor heterointerfaces until the work functions on both sides reach equilibrium, generating an oriented built‐in electric field and quite stable local nucleophilic/electrophilic regions. [ 37,38 ] As a result, the redistributed electron cloud density may significantly enhance the electric conductivity and alter the chemisorption behaviors of the reaction intermediates, ultimately leading to substantially boosted reactivity and selectivity as compared with the physical mixture and individual counterparts. [ 39,40 ] As well known, cerium oxide (CeO 2 ), benefitting from its remarkable oxygen‐storage capacity, reversible conversion between Ce 3+ and Ce 4+ oxidation states, intrinsically outstanding ionic conductivity, and rich oxygen vacancies, has recently attracted enormous attention as a promising auxiliary promoter in electrocatalysis field to improve activity and stability.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of Mott−Schottky Ni/CeO₂ Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Yin

Sun

et al. 2022

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103

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Designing affordable and efficient bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) has remained a long‐lasting target for the progressing hydrogen economy. Utilization of metal/semiconductor interface effect has been lately established as a viable implementation to realize the favorable electrocatalytic performance due to the built‐in electric field. Herein, a typical Mott–Schottky electrocatalyst by immobilizing Ni/CeO2 hetero‐nanoparticles onto N‐doped carbon nanofibers (abbreviated as Ni/CeO2@N‐CNFs hereafter) has been developed via a feasible electrospinning‐carbonization tactic. Experimental findings and theoretic calculations substantiate that the elaborated constructed Ni/CeO2 heterojunction effectively triggers the self‐driven charge transfer on heterointerfaces, leading to the promoted charge transfer rate, the optimized chemisorption energies for reaction intermediates and ultimately the expedited reaction kinetics. Therefore, the well‐designed Ni/CeO2@N‐CNFs deliver superior HER and OER catalytic activities with overpotentials of 100 and 230 mV at 10 mA cm‐2, respectively, in alkaline solution. Furthermore, the Ni/CeO2@N‐CNFs‐equipped electrolyzer also exhibits a low cell voltage of 1.56 V to attain 10 mA cm‐2 and impressive long‐term durability over 55 h. The innovative manipulation of electronic modulation via Mott–Schottky establishment may inspire the future development of economical electrocatalysts for diverse sustainable energy systems.

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“…Therefore, UOR is a favorable substitution for sluggish OER for energy‐saving hydrogen generation, accompanying by simultaneous urea‐containing wastewater remediation with non‐toxic oxidized products of CO 2 and N 2 [7] . Nevertheless, the bottleneck of UOR is its inherent sluggish six‐electron transfer process, which makes overall urea electrolysis still face low activity and high potential [8] . Thus, it demands highly active and earth‐abundant electrocatalysts to reduce the potential of UOR.…”

Section: Introductionmentioning

confidence: 99%

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Wang

Zhang

et al. 2021

ChemElectroChem

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Urea electrolysis supplies a great potential in energy-saving hydrogen generation accompanied by simultaneous ureacontaining wastewater remediation. Herein, the Co(OH) 2 nanosheets arrays doped by different amount of Cu 2 + ions were prepared via a one-step solution-phase method for ureaassisted electrolytic hydrogen generation. The Cu integration can regulate electronic structure, activate Co active sites at low potential, and optimize the charge transfer properties and adsorption states of the catalyst. Moreover, the partially distorted cobalt surroundings caused by Cu dopant in the catalyst is conductive to favor the adsorption of urea and water molecules to the active sites. The optimal Cu 6.2% -Co(OH) 2 nanosheets array exhibited superior urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) performances. Assembling an overall urea electrolyzer using two Cu 6.2% -Co(OH) 2 electrodes gave rise to very small voltages of 1.389 V for 10 mA cm À 2 and 1.781 V for a high current density of 500 mA cm À 2 with remarkable operational stability. The Cu 2 + ions doping strategy can be extended to a series of Ni-based compounds with adjustable electronic structures for boosting the activities of UOR and HER.

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Bimetal Catalysts: Bimetal Schottky Heterojunction Boosting Energy‐Saving Hydrogen Production from Alkaline Water via Urea Electrocatalysis (Adv. Funct. Mater. 21/2020)

Cited by 35 publications

References 0 publications

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Manipulation of Mott−Schottky Ni/CeO₂ Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

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Bimetal Catalysts: Bimetal Schottky Heterojunction Boosting Energy‐Saving Hydrogen Production from Alkaline Water via Urea Electrocatalysis (Adv. Funct. Mater. 21/2020)

Cited by 35 publications

References 0 publications

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Manipulation of Mott−Schottky Ni/CeO2 Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Co(OH)2 Nanosheets Array Doped by Cu2+ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

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Product

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Manipulation of Mott−Schottky Ni/CeO₂ Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation