Production of NiO/N-doped carbon hybrid and its electrocatalytic performance for oxygen evolution reactions

Seok, Sujin; Jang, Dawoon; Kim, Haeju; Park, Sunghee

doi:10.1007/s42823-019-00118-9

Cited by 13 publications

(1 citation statement)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among transition metals, Ni is one of the candidates whose OER activities are comparable to those of precious metals, as suggested by density functional theory (DFT) calculations. Various Ni-containing nanomaterials, such as NiP 2 , Ni chalcogenides, nickel oxides, and hybrids containing other metal-based species show excellent electrocatalytic performance for OER in alkaline media. − Recent experimental papers have reported excellent catalytic properties of molecularly dispersed Ni-based species on carbon-based nanomaterials . DFT calculations proposed that the rate-determining step (RDS) of Ni–C 3 N 4 is the O* formation step, while that of IrO 2 is the OOH* formation step.…”

Section: Introductionmentioning

confidence: 99%

Ni Nanoparticles on Ni Core/N-Doped Carbon Shell Heterostructures for Electrocatalytic Oxygen Evolution

Seok

Choi

Lee

et al. 2021

ACS Appl. Nano Mater.

Self Cite

View full text Add to dashboard Cite

Supported Ni-based nanocatalysts have attracted much attention to replace noble metal catalysts (e.g., IrO2) for the oxygen evolution reaction (OER) due to their low costs. However, their low activity is the main hindrance for their use in the practical OER application. In this study, a Ni-based core–shell material (Ni@Ni-NC) is produced through the heat treatment of a mixture of urea and NiCl2·(H2O)6. Multiple analysis data reveal that the Ni@Ni-NC consists of a Ni nanoparticle core and several tens of nanometer-thick, N-doped carbon (NC) shell materials, in which atomically attached Ni-based species were homogeneously distributed. Ni@Ni-NC exhibits excellent electrocatalytic OER performance with over- and onset potentials of 371 mV and 1.51 V, respectively, which are better than those of commercial IrO2. As control samples, structural and electrochemical properties of various composites (Ni nanoparticles + N-doped graphene, Ni nanoparticles + C3N4, atomically dispersed Ni on a C3N4 surface) and acid-treated Ni@Ni-NC are investigated. These experiments reveal that the well-dispersed Ni–NC species and core–shell structures play pivotal roles in improving the electrocatalytic OER performance. Furthermore, density functional theory (DFT) calculations suggest the dual-site OER mechanism of the Ni–NC active species with a significantly low reaction barrier. The mechanisms for the formation of core–shell structures are studied with control samples, which are produced from different heating times, and DFT calculation suggested that the core/shell structure formation is attributed to the cohesive energy of the Ni particles and strong bonds between the Ni and NC supports. This work provides a facile strategy for designing supported Ni catalysts with core–shell architecture for electrocatalytic reactions and other advanced applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Ni Nanoparticles on Ni Core/N-Doped Carbon Shell Heterostructures for Electrocatalytic Oxygen Evolution

Seok

Choi

Lee

et al. 2021

ACS Appl. Nano Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

Alkaline Water Splitting Using Hafnium‐Based Stable and Efficient Bifunctional Electrocatalyst

2023

View full text Add to dashboard Cite

The desire to achieve sustainable development goals inspired exploring green energy as a favorable alternative to hazardous fossil fuel‐based energy. Alkaline water electrolysis is a promising candidate for producing low‐cost pure green hydrogen; however, the efficiency of non‐precious transitional metal‐based catalysts is still behind noble electrocatalysts (like Pt and IrO2). To make hydrogen a next‐generation fuel, the replacement of high‐cost scarce noble metal is required. An attempt has been made to use a non‐precious transitional bimetallic combination of hafnium nickel diselenide/ reduced graphene oxide (HfNiSe2/rGO) for HER, OER, and overall water splitting. HfNiSe2/rGO demonstrated good electrocatalytic performance; for achieving 10 mA/cm2 of current density, the overpotential requirement is 162 mV for hydrogen evolution reaction (HER) and 320 mV for oxygen evolution reaction (OER) at 20 mA/cm2 of current density. Similarly, a low Tafel slope is required, 49 mV dec−1 for HER and 66 mV dec−1 for OER in 1 M KOH with high stability. HfNiSe2/rGO also showed highly stable activity for overall water splitting, requiring only 1.56 V to attain 10 mA/cm2 of current density. The result indicates HfNiSe2/rGO is a suitable electrocatalyst for green hydrogen generation because of its ease of production, economical, good activity, and stability towards water splitting.

show abstract

Hydrogen‐Rich Pyrolysis from Ni‐Fe Heterometallic Schiff Base Centrosymmetric Cluster Facilitates NiFe Alloy for Efficient OER Electrocatalysts

Zhou

Gan

Yan

et al. 2023

Small

View full text Add to dashboard Cite

Binary metal nickel‐iron alloys have been proven to have great potential in oxygen evolution reaction (OER) electrocatalysis, but there are still certain challenges in how to construct more efficient nickel‐iron alloy electrocatalysts and maximize their own advantages. In this work, a heterometallic nickel‐iron cluster (L = C64H66Fe4N8Ni2O19) of Schiff base (LH3 = 2‐amino‐1,3‐propanediol salicylaldehyde) is designed as a precursor to explore its behavior in the pyrolysis process under inert atmosphere. The combination of TG‐MS, morphology, and X‐ray characterization techniques shows that the Schiff base ligands in the heterometallic clusters produces a strong reductive atmosphere during pyrolysis, which enable the two 3d metals Ni and Fe to form NiFe alloys. Moreover, Fe2O3/Fe0.64Ni0.36@Cs carbon nanomaterials are formed, in which Fe2O3/Fe0.64Ni0.36 is the potential active material for OER. It is also found that the centrosymmetric structure of the heterometallic Schiff base precursor is potentially related to the formation of the Fe2O3/Fe0.64Ni0.36 alloy@carbon structures. The Fe2O3/Fe0.64Ni0.36@C‐800 provides 274 mV overpotential in 1 m KOH solution at 10 mA cm−2 in OER. This work provides an effective basis for further research on Schiff base bimetallic doping‐derived carbon nanomaterials as excellent OER electrocatalysts.

show abstract

Production of NiO/N-doped carbon hybrid and its electrocatalytic performance for oxygen evolution reactions

Cited by 13 publications

References 27 publications

Ni Nanoparticles on Ni Core/N-Doped Carbon Shell Heterostructures for Electrocatalytic Oxygen Evolution

Ni Nanoparticles on Ni Core/N-Doped Carbon Shell Heterostructures for Electrocatalytic Oxygen Evolution

Alkaline Water Splitting Using Hafnium‐Based Stable and Efficient Bifunctional Electrocatalyst

Hydrogen‐Rich Pyrolysis from Ni‐Fe Heterometallic Schiff Base Centrosymmetric Cluster Facilitates NiFe Alloy for Efficient OER Electrocatalysts

Contact Info

Product

Resources

About