High-valence-state nickel-iron phosphonates with urchin-like hierarchical architecture for highly efficient oxygen evolution reaction

AbstractNickel–iron-layered double hydroxide (NiFe LDH) platelets with high morphological regularity and submicrometre lateral dimensions were synthesized using a homogeneous precipitation technique for highly efficient catalysis of the oxygen evolution reaction (OER). Considering edge sites are the point of activity, efforts were made to control platelet size within the synthesized dispersions. The goal is to controllably isolate and characterize size-reduced NiFe LDH particles. Synthetic approaches for size control of NiFe LDH platelets have not been transferable based on published work with other LDH materials and for that reason, we instead use postsynthetic treatment techniques to improve edge-site density. In the end, size-reduced NiFe LDH/single-wall carbon nanotube (SWCNT) composites allowed to further reduce the OER overpotential to 237 ± 7 mV (<L> = 0.16 ± 0.01 μm, 20 wt% SWCNT), which is one of the best values reported to date. This approach as well improved the long-term activity of the catalyst in operating conditions.

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MOF-derived M-OOH with rich oxygen defects by in-situ electro-oxidation reconstitution for highly efficient oxygen evolution reaction

Journal of Materials Chemistry A ◽

10.1039/d1ta01638e ◽

2021 ◽

Author(s):

Zhikai Shi ◽

Zebin Yu ◽

Ronghua Jiang ◽

Jun Huang ◽

Yanping Hou ◽

...

Keyword(s):

Oxygen Evolution ◽

Oxygen Evolution Reaction ◽

Energy Production ◽

Low Cost ◽

Highly Efficient ◽

Oxygen Defects ◽

Electro Oxidation

The oxygen evolution reaction (OER) is an important half-reaction in the field of energy production. However, how effectively, simply, and greenly to prepare low-cost OER electrocatalysts remains a problem. Herein,...

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In-situ coating amorphous boride on ternary pyrite-type boron sulfide for highly efficient oxygen evolution

Journal of Materials Chemistry A ◽

10.1039/d0ta10633j ◽

2021 ◽

Author(s):

Tingting Li ◽

Tianyun Jing ◽

Dewei Rao ◽

Xiaotian Jia ◽

Yunpeng Zuo ◽

...

Keyword(s):

Oxygen Evolution ◽

Oxygen Evolution Reaction ◽

Highly Efficient ◽

In Situ Coating ◽

Electrochemical Oxygen

Multimetallic pyrite-type sulfides have been a promising electrocatalytic materials for electrochemical oxygen evolution reaction (OER), but still requires further improve due to the easily oxidization of surface atoms and the...

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Interfacing RuO2 with Pt to induce efficient charge transfer from Pt to RuO2 for highly efficient and stable oxygen evolution under acidic media

Journal of Materials Chemistry A ◽

10.1039/d1ta01587g ◽

2021 ◽

Author(s):

Taehyun Kwon ◽

Heesu Yang ◽

Minki Jun ◽

Taekyung Kim ◽

Jinwhan Joo ◽

...

Keyword(s):

Charge Transfer ◽

Oxygen Evolution ◽

Oxygen Evolution Reaction ◽

Acidic Media ◽

Highly Efficient ◽

Efficient Charge ◽

Stable Oxygen ◽

The Stability

The oxygen evolution reaction (OER) requires a large overpotential which undermines the stability of electrocatalysts, typically IrOx or RuOx. RuOx is particularly vulnerable to high overpotential in acidic media, due...

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