scholarly journals Fe(III) Ions-Assisted Aniline Polymerization Strategy to Nitrogen-Doped Carbon-Supported Bimetallic CoFeP Nanospheres as Efficient Bifunctional Electrocatalysts toward Overall Water Splitting

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1473
Author(s):  
Changhao Zhao ◽  
Fen Wei ◽  
Haolin Lv ◽  
Dengke Zhao ◽  
Nan Wang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Active Sites ◽  
Alkaline Media ◽  
Alkaline Electrolyte ◽  
Nitrogen Doped ◽  
Overall Water Splitting ◽  
Electrochemical Water Splitting ◽  
Acidic And Alkaline Media ◽  
Aniline Polymerization

It remains an urgent demand and challenging task to design and fabricate efficient, stable, and inexpensive catalysts toward sustainable electrochemical water splitting for hydrogen production. Herein, we explored the use of Fe(III) ion-assisted aniline polymerization strategy to embed bimetallic CoFeP nanospheres into the nitrogen-doped porous carbon framework (referred CoFeP-NC). The as-prepared CoFeP-NC possesses excellent hydrogen evolution reaction (HER) performance with the small overpotential (η10) of 81 mV and 173 mV generated at a current density of 10 mA cm−2 in acidic and alkaline media, respectively. Additionally, it can also efficiently catalyze water oxidation (OER), which shows an ideal overpotential (η10) of 283 mV in alkaline electrolyte (pH = 14). The remarkable catalytic property of CoFeP-NC mainly stems from the strong synergetic effects of CoFeP nanospheres and carbon network. On the one hand, the interaction between the two can make better contact between the electrolyte and the catalyst, thereby providing a large number of available active sites. On the other hand, it can also form a network to offer better durability and electrical conductivity (8.64 × 10−1 S cm−1). This work demonstrates an efficient method to fabricate non-noble electrocatalyst towards overall water splitting, with great application prospect.

A novel ligand with –NH2 and –COOH-decorated Co/Fe-based oxide for an efficient overall water splitting: dual modulation roles of active sites and local electronic structure

2020 ◽  
Vol 10 (18) ◽  
pp. 6266-6273
Author(s):  
Yalan Zhang ◽  
Zebin Yu ◽  
Ronghua Jiang ◽  
Jung Huang ◽  
Yanping Hou ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Water Splitting ◽  
Energy Demand ◽  
Active Sites ◽  
Electrode Materials ◽  
Global Energy ◽  
Overall Water Splitting ◽  
Local Electronic Structure ◽  
Electrochemical Water Splitting

Excellent electrochemical water splitting with remarkable durability can provide a solution to satisfy the increasing global energy demand in which the electrode materials play an important role.

Hierarchical Mo-doped CoP3 interconnected nanosheet arrays on carbon cloth as an efficient bifunctional electrocatalyst for water splitting in an alkaline electrolyte

2020 ◽  
Vol 49 (17) ◽  
pp. 5563-5572
Author(s):  
Shasha Zhang ◽  
Mingjing Guo ◽  
Shuyi Song ◽  
Ke Zhan ◽  
Ya Yan ◽  
...  
Keyword(s):  
Water Splitting ◽  
Alkaline Media ◽  
Alkaline Electrolyte ◽  
Carbon Cloth ◽  
Bifunctional Electrocatalyst ◽  
Overall Water Splitting ◽  
Nanosheet Arrays

Hierarchical Mo-doped CoP3 nanosheet arrays were fabricated on carbon cloth to serve as an efficient and robust bifunctional electrocatalyst for overall water splitting in alkaline media.

scholarly journals Construction of FeCo2O4@N-Doped Carbon Dots Nanoflowers as Binder Free Electrode for Reduction and Oxidation of Water

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3119
Author(s):  
Aniruddha Kundu ◽  
Akhmad Irhas Robby ◽  
Arnab Shit ◽  
Hyeong Jun Jo ◽  
Sung Young Park
Keyword(s):  
Water Splitting ◽  
Carbon Dots ◽  
Active Sites ◽  
Nickel Foam ◽  
Alkaline Media ◽  
Superior Performance ◽  
Catalytic Support ◽  
Electrochemical Water Splitting ◽  
Electron Transfer Processes ◽  
Doped Carbon Dots

Electrochemical water splitting is known as a potential approach for sustainable energy conversion; it produces H2 fuel by utilizing transition metal-based catalysts. We report a facile synthesis of FeCo2O4@carbon dots (CDs) nanoflowers supported on nickel foam through a hydrothermal technique in the absence of organic solvents and an inert environment. The synthesized material with a judicious choice of CDs shows superior performance in hydrogen and oxygen evolution reactions (HER and OER) compared to the FeCo2O4 electrode alone in alkaline media. For HER, the overpotential of 205 mV was able to produce current densities of up to 10 mA cm−2, whereas an overpotential of 393 mV was needed to obtain a current density of up to 50 mA cm−2 for OER. The synergistic effect between CDs and FeCo2O4 accounts for the excellent electrocatalytic activity, since CDs offer exposed active sites and subsequently promote the electrochemical reaction by enhancing the electron transfer processes. Hence, this procedure offers an effective approach for constructing metal oxide-integrated CDs as a catalytic support system to improve the performance of electrochemical water splitting.

An Efficient Nickel Sulfide@NiO Nanocomposite Catalyst with High Density of Active Sites for the Hydrogen Evolution Reaction in Alkaline Media

2021 ◽  
Vol 21 (4) ◽  
pp. 2520-2528
Author(s):  
Shams Parveen Khokhar ◽  
Mazhar Ali Abbasi ◽  
Umair Aftab ◽  
Muhammad Ishaq Abro ◽  
Aqeel Ahmed Shah ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
Alkaline Media ◽  
Alkaline Electrolyte ◽  
Oxide Content ◽  
Onset Potential ◽  
Composite Catalysts

Efficient hydrogen evolution reaction (HER) catalysts based on the earth-abundant materials are highly vital to design practical and environmentally friendly water splitting devices. In this study, we present an optimized strategy for the development of active catalysts for hydrogen evolution reaction HER. The composite catalysts are prepared with the nanosurface of NiO for the deposition of NiS by hydrothermal method. In alkaline electrolyte, the NiS/NiO nanocomposite has shown excellent catalytic HER properties at the low onset potential and small Tafel slope of 72 mVdec-1. A current density of 10 mA/cm2 is achieved by the nanocomposite obtained with 0.4 gram of NiO as nanosurface for the deposition of NiS (sample 4) at the cost of 429 mV versus RHE. The sample 4 carries more active sites that allow it to act as excellent HER catalyst. Based on this study, we conclude that increasing the nickel oxide content into composite sample facilitates the HER process. Additionally, a long term HER stability for 10 hours and good durability is also demonstrated by the sample 4. Our findings reveal that the optimization of nickel oxide content in the preparation of catalyst leads to the excellent HER activity for the design of practical water splitting devices and other related applications.

scholarly journals Facile Synthesis of Copper Oxide-Cobalt Oxide/Nitrogen-Doped Carbon (Cu2O-Co3O4/CN) Composite for Efficient Water Splitting

2021 ◽  
Vol 11 (21) ◽  
pp. 9974
Author(s):  
Zaffar Ahmed Shaikh ◽  
Nikita Moiseev ◽  
Alexey Mikhaylov ◽  
Serhat Yüksel
Keyword(s):  
Copper Oxide ◽  
Cobalt Oxide ◽  
Water Splitting ◽  
Water Oxidation ◽  
Linear Sweep Voltammetry ◽  
Electrochemical Catalysis ◽  
Onset Potential ◽  
Nitrogen Doped ◽  
Electrochemical Water Splitting ◽  
Nitrogen Doped Carbon

Herein, we report a copper oxide-cobalt oxide/nitrogen-doped carbon hybrid (Cu2O-Co3O4/CN) composite for electrochemical water splitting. Cu2O-Co3O4/CN is synthesized by an easy two-step reaction of melamine with Cu2O-Co3O4/CN composite. The designed composite is aimed to solve energy challenges by producing hydrogen and oxygen via electrochemical catalysis. The proposed composite offers some unique advantages in water splitting. Carbon imparts superior conductivity, while the water oxidation abilities of Cu2O and Co3O4 are considered to constitute a catalyst. The synthesized composite (Cu2O-Co3O4/CN) is characterized by SEM, EDS, FTIR, TEM, and AFM in terms of the size, morphology, shape, and elemental composition of the catalyst. The designed catalyst’s electrochemical performance is evaluated via linear sweep voltammetry (LSV) and cyclic voltammetry (CV). The Cu2O-Co3O4/CN composite shows significant electrocatalytic activity, which is further improved by introducing nitrogen doped carbon (current density 10 mA cm−2, onset potential 91 mV, and overpotential 396 mV).

Construction of Fe-doped CoP with hybrid nanostructures as a bifunctional catalyst for overall water splitting

2021 ◽  
Author(s):  
Qinghua Yang ◽  
Jiang Dai ◽  
Wenhao Liao ◽  
Xianfeng Tong ◽  
Yan Fu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Active Sites ◽  
Bifunctional Catalyst ◽  
Hybrid Nanostructures ◽  
Overall Water Splitting ◽  
Electrochemical Water Splitting

With the open skeleton structures, adjustable active sites and homogeneous catalytic centers, PBA-based materials had promising applications in electrochemical water splitting. Herein, we reported a PBA derived Fe0.25-CoP electrocatalyst with...

Hierarchical superhydrophilic/superaerophobic CoMnP/Ni2P nanosheets-based microplates arrays for enhanced overall water splitting

2021 ◽  
Author(s):  
Mengzhao Liu ◽  
Zhe Sun ◽  
Shiyan Li ◽  
Xiaowa Nie ◽  
Yuefeng Liu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
Water Electrolysis ◽  
Alkaline Media ◽  
Industrial Water ◽  
Overall Water Splitting ◽  
Bifunctional Electrocatalysts ◽  
Acidic And Alkaline Media

The development of efficient and stable non-noble metal bifunctional electrocatalysts for overall water splitting in acidic and alkaline media is highly desirable for industrial water electrolysis, but remains a profound...

Homologous metal-free electrocatalysts grown on three-dimensional carbon networks for overall water splitting in acidic and alkaline media

2016 ◽  
Vol 4 (33) ◽  
pp. 12878-12883 ◽  
Author(s):  
Zheng Peng ◽  
Siwei Yang ◽  
Dingsi Jia ◽  
Peimei Da ◽  
Peng He ◽  
...  
Keyword(s):  
Water Splitting ◽  
Three Dimensional ◽  
Alkaline Media ◽  
Metal Free ◽  
Overall Water Splitting ◽  
Carbon Networks ◽  
Acidic And Alkaline Media

Homologous metal-free electrocatalysts grown on three-dimensional carbon networks are integrated for overall water splitting in acidic and alkaline media.

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