A copper interface promotes the transformation of nickel hydroxide into high-valent nickel for an efficient oxygen evolution reaction

Zhou, Fengcheng; Huang, Aiming; Wang, Yong; Chu, W. K.; Wen, Li

doi:10.1039/d3qi00980g

Cited by 5 publications

(1 citation statement)

References 53 publications

(70 reference statements)

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“…Besides optimization of the composition of cobalt-based electrocatalysts, their stability during OER is an area of active investigation. Cobalt electrocatalysts often exhibit mixed valence states of Co 2+/3+/4+ in the different constituent phases but these phases are known to transform to hydroxides and oxyhydroxides during the oxygen evolution reaction [ 9 , 24 , 25 ]. For instance, Co 2 P [ 26 ] and CoF 2 electrocatalysts rapidly transform to Co(OH) 2 under the reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Nanoengineered Cobalt Electrocatalyst for Alkaline Oxygen Evolution Reaction

Rajagopal,

Mehla,

Jones

et al. 2024

Nanomaterials

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The alkaline oxygen evolution reaction (OER) remains a bottleneck in green hydrogen production owing to its slow reaction kinetics and low catalytic efficiencies of earth abundant electrocatalysts in the alkaline OER reaction. This study investigates the OER performance of hierarchically porous cobalt electrocatalysts synthesized using the dynamic hydrogen bubble templating (DHBT) method. Characterization studies revealed that electrocatalysts synthesized under optimized conditions using the DHBT method consisted of cobalt nanosheets, and hierarchical porosity with macropores distributed in a honeycomb network and mesopores distributed between cobalt nanosheets. Moreover, X-ray photoelectron spectroscopy studies revealed the presence of Co(OH)2 as the predominant surface cobalt species while Raman studies revealed the presence of the cubic Co3O4 phase in the synthesized electrocatalysts. The best performing electrocatalyst required only 360 mV of overpotential to initiate a current density of 10 mA cm−2, exhibited a Tafel slope of 37 mV dec−1, and stable OER activity over 24 h. The DHBT method offers a facile, low cost and rapid synthesis approach for preparation for highly efficient cobalt electrocatalysts.

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Section: Introductionmentioning

confidence: 99%

Nanoengineered Cobalt Electrocatalyst for Alkaline Oxygen Evolution Reaction

Rajagopal,

Mehla,

Jones

et al. 2024

Nanomaterials

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Inspiration of Bimetallic Peroxide for Controllable Electrooxidizing Ethylene Glycol Through Modulating Surficial Intermediates

Lin,

Chen,

Ren

et al. 2024

Adv Funct Materials

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Biomass feedstock ethylene glycol (EG) can be anodically oxidized to the high‐value glycolic acid (GA), which is widely considered as one critical raw material of biodegradable plastics. Developing low‐cost electrocatalyst to economically produce GA with high selectivity still meeting challenges. Herein, a non‐precious Co‐Ni bimetal catalysts are developed for controllable electrooxidizing EG to GA (EGOR). Through regulating the generation of key intermediate (CH2OH‐CO*) on the low‐cost catalyst surface, a successive electrooxidation from EG to GA has been achieved with high selective (96.3%) and conversion rate (>85%) at current density of 150 mA cm−2, which is on par with the reported precious metal catalysts. Through coupling with hydrogen evolution reaction (EGOR‐HER), 2.759 mmol H2 and 7.48 mmol of GA are generated at 80 mA cm−2, which also can save 27% energy comparing with a water splitting system. The synergistic effect between Co and Ni in the bimetallic catalyst has been exploited: high‐valent CoOOH sites catalyzed the generation of CH2OH‐CO* and reduce the energy barrier during GA formation; Whereas, Ni sites can effectively facilitate the formation of CoOOH and improve the adsorption of EG.

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Regulating the electronic state of SnO2@NiFe-LDH heterojunction: Activating lattice oxygen for efficient oxygen evolution reaction

Yin,

Zhou,

Ding

et al. 2024

Fuel

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A copper interface promotes the transformation of nickel hydroxide into high-valent nickel for an efficient oxygen evolution reaction

Abstract: The anodic oxygen evolution reaction (OER) hinders the development of hydrogen production by electrolysis of water due to its slow reaction kinetics. Ni in the high-valent state has shown promising...

Cited by 5 publications

References 53 publications

Nanoengineered Cobalt Electrocatalyst for Alkaline Oxygen Evolution Reaction

Nanoengineered Cobalt Electrocatalyst for Alkaline Oxygen Evolution Reaction

Inspiration of Bimetallic Peroxide for Controllable Electrooxidizing Ethylene Glycol Through Modulating Surficial Intermediates

Regulating the electronic state of SnO2@NiFe-LDH heterojunction: Activating lattice oxygen for efficient oxygen evolution reaction

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