Na4Ni3P4O15–Ni(OH)2 core–shell nanoparticles as hybrid electrocatalysts for the oxygen evolution reaction in alkaline electrolytes

2020 ◽  
Vol 49 (24) ◽  
pp. 8226-8237 ◽  
Author(s):  
Chen Mu ◽  
Denys S. Butenko ◽  
Ievgen V. Odynets ◽  
Іgor V. Zatovsky ◽  
Junzhi Li ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Alkaline Medium ◽  
Oxygen Evolution Reaction ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Electrochemical Conversion ◽  
Alkaline Electrolytes ◽  
Core Shell Nanoparticles

Core(phosphate)–shell(Ni(OH)2–NiOOH) nanoparticles as stable OER electrocatalysts with low overpotentials of 250–290 mV were prepared by chemical and electrochemical conversion of phosphate in an alkaline medium.

scholarly journals Au@Co2P core/shell nanoparticles as a nano-electrocatalyst for enhancing the oxygen evolution reaction

RSC Advances ◽  
2019 ◽  
Vol 9 (70) ◽  
pp. 40811-40818 ◽  
Author(s):  
Xiaofang Zhang ◽  
Aixian Shan ◽  
Sibin Duan ◽  
Haofei Zhao ◽  
Rongming Wang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Reaction Performance ◽  
Core Shell Nanoparticles

Au@Co2P core/shell nanoparticles were designed and prepared to improve the oxygen evolution reaction performance.

scholarly journals Facile Synthesis of Co3O4@CoO@Co Gradient Core@Shell Nanoparticles and Their Applications for Oxygen Evolution and Reduction in Alkaline Electrolytes

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2703
Author(s):  
Shih-Cheng Chou ◽  
Kuang-Chih Tso ◽  
Yi-Chieh Hsieh ◽  
Bo-Yao Sun ◽  
Jyh-Fu Lee ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Specific Activity ◽  
Hydrothermal Process ◽  
Core Shell ◽  
Synthetic Approach ◽  
Co3o4 Nanoparticles ◽  
Shell Nanoparticles ◽  
Alkaline Electrolytes ◽  
Co Nanoparticles ◽  
Core Shell Nanoparticles

We demonstrate a facile fabrication scheme for Co3O4@CoO@Co (gradient core@shell) nanoparticles on graphene and explore their electrocatalytic potentials for an oxygen evolution reaction (OER) and an oxygen reduction reaction (ORR) in alkaline electrolytes. The synthetic approach begins with the preparation of Co3O4 nanoparticles via a hydrothermal process, which is followed by a controlled hydrogen reduction treatment to render nanoparticles with radial constituents of Co3O4/CoO/Co (inside/outside). X-ray diffraction patterns confirm the formation of crystalline Co3O4 nanoparticles, and their gradual transformation to cubic CoO and fcc Co on the surface. Images from transmission electron microscope reveal a core@shell microstructure. These Co3O4@CoO@Co nanoparticles show impressive activities and durability for OER. For ORR electrocatalysis, the Co3O4@CoO@Co nanoparticles are subjected to a galvanic displacement reaction in which the surface Co atoms undergo oxidative dissolution for the reduction of Pt ions from the electrolyte to form Co3O4@Pt nanoparticles. With commercial Pt/C as a benchmark, we determine the ORR activities in sequence of Pt/C > Co3O4@Pt > Co3O4. Measurements from a rotation disk electrode at various rotation speeds indicate a 4-electron transfer path for Co3O4@Pt. In addition, the specific activity of Co3O4@Pt is more than two times greater than that of Pt/C.

Ni–Pd core–shell nanoparticles with Pt-like oxygen reduction electrocatalytic performance in both acidic and alkaline electrolytes

2017 ◽  
Vol 5 (19) ◽  
pp. 9233-9240 ◽  
Author(s):  
Jun Jiang ◽  
Han Gao ◽  
Shu Lu ◽  
Xing Zhang ◽  
Chu-Ya Wang ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Electrocatalytic Performance ◽  
Alkaline Electrolytes ◽  
Alkaline Conditions ◽  
Core Shell Nanoparticles

The prepared monodisperse Ni@Pd3 core–shell nanoparticles with a Pd-enriched surface exhibited a Pt-like ORR electrocatalytic activity and long durability under both acidic and alkaline conditions.

Pd–Ru core–shell nanoparticles with tunable shell thickness for active and stable oxygen evolution performance

Nanoscale ◽  
2018 ◽  
Vol 10 (32) ◽  
pp. 15173-15177 ◽  
Author(s):  
Lucy Gloag ◽  
Tania M. Benedetti ◽  
Soshan Cheong ◽  
Richard F. Webster ◽  
Christopher E. Marjo ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Shell Thickness ◽  
Thin Shells ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Ru Nanoparticles ◽  
Stable Oxygen ◽  
Stable Core ◽  
Core Shell Nanoparticles ◽  
Improve Stability

Pd–Ru nanoparticles with thin shells and a stable core are shown to improve stability in oxygen evolution reaction catalysis while retaining high activity.

scholarly journals Electrochemical synthesis of core–shell nanoparticles by seed-mediated selective deposition

2021 ◽  
Author(s):  
Joon Ho Park ◽  
Seon-Mi Jin ◽  
Eunji Lee ◽  
Hyun S. Ahn
Keyword(s):  
Oxygen Evolution ◽  
Electrochemical Synthesis ◽  
Electrochemical Methods ◽  
Core Shell ◽  
Selective Deposition ◽  
Shell Nanoparticles ◽  
The Core ◽  
Seed Mediated ◽  
Core Shell Nanoparticles

Core–shell nanoparticles can be synthesized by pure electrochemical methods, and the size of the core and the thickness of the shell can be precisely controlled. The nanoparticle-decorated electrodes exhibited respectable oxygen evolution catalysis.

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