d-Band center modulating of CoOx/Co9S8 by oxygen vacancies for fast-kinetics pathway of water oxidation

Tang, Yu; Shen, Kaiyuan; Zheng, Jie; He, Baihua; Chen, Jiali; Lü, Jianguo; Ge, Wen; Shen, Lanxian; Yang, Peizhi; Deng, Shaozhi

doi:10.1016/j.cej.2021.130915

Cited by 39 publications

(16 citation statements)

References 64 publications

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“…The d-band center of Ni 0.8 Cu 0.2 O and Mo 0.1 –Ni 0.8 Cu 0.2 O are calculated to be −1.351 and −1.106 eV, respectively. Obviously, the d-band center shifted closer to the Fermi level after the introduction of MoO 3 to Ni 0.8 Cu 0.2 O, indicating that the anti-bonding energy states are higher and the interaction between the adsorbates (AB and CH 3 OH) and the catalyst is strengthened . In this case, the bonds of the polar reactants on the catalyst surface were strengthened, conducive to the activation of reactants and thereof promoting the activity toward AB methanolysis.…”

Section: Resultsmentioning

confidence: 96%

“…This result can well demonstrate that the AB molecules tend to be adsorbed on the Cu sites, while the CH 3 OH molecules tend to be adsorbed on the Ni sites 2 O, indicating that the anti-bonding energy states are higher and the interaction between the adsorbates (AB and CH 3 OH) and the catalyst is strengthened. 58 In this case, the bonds of the polar reactants on the catalyst surface were strengthened, conducive to the activation of reactants and thereof promoting the activity toward AB methanolysis. Apart from the facility in the absorption process for AB and CH 3 OH, MoO 3 conduces to the de-adsorption of hydrogen from the catalyst surface, 59 which is also favorable for an acceleration of the hydrogen production from AB methanolysis.…”

Section: Methodsmentioning

confidence: 95%

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Modulating the Acidic Properties of Mesoporous Mo_x–Ni_0.8Cu_0.2O Nanowires for Enhanced Catalytic Performance toward the Methanolysis of Ammonia Borane for Hydrogen Production

Feng

Zhang

Shao

et al. 2022

ACS Appl. Mater. Interfaces

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Rational construction of inexpensive, highly efficient, and stable catalysts for ammonia borane (AB) methanolysis is in high demand but still remains a great challenge. In this work, we have successfully fabricated uniform Mo x −Ni 0.8 Cu 0.2 O nanowires using a simple hydrothermal method followed by a post-calcination treatment and flexibly modulated the acidity of their surface by changing the amount of Mo introduced into Ni 0.8 Cu 0.2 O. The Mo 0.1 −Ni 0.8 Cu 0.2 O catalyst displayed strong catalytic activity toward AB methanolysis with an ultrahigh turnover frequency of 46.9 mol H 2 mol cat.−1 min −1 , which is even higher than some noble metal catalysts. In this work, an equation regarding the relationship between the quantity of moderated acid sites of catalysts and its corresponding activity toward AB methanolysis was first determined. A plausible mechanism for AB methanolysis catalyzed by Mo x − Ni 0.8 Cu 0.2 O was proposed, and the benefits of the introduction of MoO 3 to Ni 0.8 Cu 0.2 O for enhancing the catalytic performance were also discussed. These findings can form a basis for the rational construction of inexpensive catalysts with robust performance toward AB methanolysis for hydrogen production.

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Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 95%

Modulating the Acidic Properties of Mesoporous Mo_x–Ni_0.8Cu_0.2O Nanowires for Enhanced Catalytic Performance toward the Methanolysis of Ammonia Borane for Hydrogen Production

Feng

Zhang

Shao

et al. 2022

ACS Appl. Mater. Interfaces

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“…According to the Sabatier principle, a moderate bonding of the reaction intermediates is necessary to maximize the electrocatalytic activity . While high E d energy levels have empty antibonding states, thus a strong binding that is detrimental to the desorption of oxygen, , the dual-phase nitride endows the surface with an appropriate E d energy level and balances the *O 2p level, thus maximizing the OER activity.…”

Section: Resultsmentioning

confidence: 99%

Cobalt Molybdenum Nitride-Based Nanosheets for Seawater Splitting

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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The development of cost-effective bifunctional catalysts for water electrolysis is both a crucial necessity and an exciting scientific challenge. Herein, a simple approach based on a metal–organic framework sacrificial template to preparing cobalt molybdenum nitride supported on nitrogen-doped carbon nanosheets is reported. The porous structure of produced composite enables fast reaction kinetics, enhanced stability, and high corrosion resistance in critical seawater conditions. The cobalt molybdenum nitride-based electrocatalyst is tested toward both oxygen evolution reaction and hydrogen evolution reaction half-reactions using the seawater electrolyte, providing excellent performances that are rationalized using density functional theory. Subsequently, the nitride composite is tested as a bifunctional catalyst for the overall splitting of KOH-treated seawater from the Mediterranean Sea. The assembled system requires overpotentials of just 1.70 V to achieve a current density of 100 mA cm–2 in 1 M KOH seawater and continuously works for over 62 h. This work demonstrates the potential of transition-metal nitrides for seawater splitting and represents a step forward toward the cost-effective implementation of this technology.

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“…Meanwhile, transition-metal-based compounds, especially the group VIII 3d metals of Fe, Co, and Ni, are attractive as nonprecious metal catalysts for the electrochemical water oxidation reaction due to their low cost, abundant resources, high activity, long-term durability, and excellent electronic properties. − For example, Zhang et al fabricated a series of hierarchical Co 3 O 4 hollow nanoplates doped with different metal atoms and found that Fe-doped Co 3 O 4 exhibited superior electrocatalytic properties for OER with an overpotential of 262 mV at 10 mA cm –2 . Wang et al synthesized single-atomic-Mo-dispersed Co 9 S 8 nanoflakes and the advanced catalyst exhibited pronounced water oxidation activities in universal pH conditions.…”

Section: Introductionmentioning

confidence: 99%

Waste to Treasure: Regeneration of Porous Co-Based Catalysts from Spent LiCoO₂ Cathode Materials for an Efficient Oxygen Evolution Reaction

Bian

Zhu

et al. 2022

ACS Sustainable Chem. Eng.

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The increasing demand for portable electronic devices and electric vehicles (EVs) has triggered the rapid growth of the rechargeable Li-ion battery (LIB) market. However, in the near future, it is predicted that a large amount of spent LIBs will be scrapped, imposing huge pressure on environmental protection and resource reclaiming. The effective recycling or regeneration of the spent LIBs not only relieves the environmental burdens but also avoids the waste of valuable metal resources. Herein, a porous Co9S8/Co3O4 heterostructure is successfully synthesized from the spent LiCoO2 (LCO) cathode materials via a conventional hydrometallurgy and sulfidation process. The fabricated Co9S8/Co3O4 catalyst exhibits high catalytic activity toward oxygen evolution reaction (OER) in an alkaline solution, with an overpotential of 274 mV to achieve the current density of 10 mA cm–2 and a Tafel slope of 48.7 mV dec–1. This work demonstrates a facile regeneration process of Co-based electrocatalysts from the spent LiCoO2 cathode materials for efficient oxygen evolution reaction.

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d-Band center modulating of CoOx/Co9S8 by oxygen vacancies for fast-kinetics pathway of water oxidation

Cited by 39 publications

References 64 publications

Modulating the Acidic Properties of Mesoporous Mo_x–Ni_0.8Cu_0.2O Nanowires for Enhanced Catalytic Performance toward the Methanolysis of Ammonia Borane for Hydrogen Production

Modulating the Acidic Properties of Mesoporous Mo_x–Ni_0.8Cu_0.2O Nanowires for Enhanced Catalytic Performance toward the Methanolysis of Ammonia Borane for Hydrogen Production

Cobalt Molybdenum Nitride-Based Nanosheets for Seawater Splitting

Waste to Treasure: Regeneration of Porous Co-Based Catalysts from Spent LiCoO₂ Cathode Materials for an Efficient Oxygen Evolution Reaction

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d-Band center modulating of CoOx/Co9S8 by oxygen vacancies for fast-kinetics pathway of water oxidation

Cited by 39 publications

References 64 publications

Modulating the Acidic Properties of Mesoporous Mox–Ni0.8Cu0.2O Nanowires for Enhanced Catalytic Performance toward the Methanolysis of Ammonia Borane for Hydrogen Production

Modulating the Acidic Properties of Mesoporous Mox–Ni0.8Cu0.2O Nanowires for Enhanced Catalytic Performance toward the Methanolysis of Ammonia Borane for Hydrogen Production

Cobalt Molybdenum Nitride-Based Nanosheets for Seawater Splitting

Waste to Treasure: Regeneration of Porous Co-Based Catalysts from Spent LiCoO2 Cathode Materials for an Efficient Oxygen Evolution Reaction

Contact Info

Product

Resources

About

Modulating the Acidic Properties of Mesoporous Mo_x–Ni_0.8Cu_0.2O Nanowires for Enhanced Catalytic Performance toward the Methanolysis of Ammonia Borane for Hydrogen Production

Modulating the Acidic Properties of Mesoporous Mo_x–Ni_0.8Cu_0.2O Nanowires for Enhanced Catalytic Performance toward the Methanolysis of Ammonia Borane for Hydrogen Production

Waste to Treasure: Regeneration of Porous Co-Based Catalysts from Spent LiCoO₂ Cathode Materials for an Efficient Oxygen Evolution Reaction