Bimetallic Co-Based (CoM, M = Mo, Fe, Mn) Coatings for High-Efficiency Water Splitting

Milikić, Jadranka; Balčiūnaitė, Aldona; Sukackienė, Zita; Mladenović, Dušan; Santos, Diogo M.F.; Tamašauskaitė–Tamašiūnaitė, Loreta; Šljukić, Biljana

doi:10.3390/ma14010092

Cited by 22 publications

(18 citation statements)

References 59 publications

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“…For comparison, the overpotential of CoMo/CoMoP/NF (104 mV) with greater advantage at 100 mA cm –2 is also shown in Figure b. What is more, the as-prepared CoMo/CoMoP/NF still shows superior activity compared with other recently reported advanced metal/metal phosphide electrocatalysts (Figure h), such as Mo-CoP (40 mV), Co-Mo-B-P/CF (48 mV), CoP/MoP@NC/CC (94 mV), and so on, ,,,,,,− which indicates that this alloy/phosphide heterostructure electrocatalyst has a unique advantage in high HER activity. As expected, Figure c shows that the corresponding Tafel slopes of Pt/C (30.8 mV dec –1 ) are almost equal to the results of previous studies. , The Tafel slope of CoMo/CoMoP/NF is 46.4 mV dec –1 and is lower than those of CoMo/CoMo-LDH/NF, CoMo/NF, CoMoP/NF, CoMo-LDH/NF, and Co-MOF/NF, which reveals that the CoMo/CoMoP/NF undergoes the Volmer–Heyrovsky reaction.…”

Section: Resultsmentioning

confidence: 76%

Synergistically Coupled CoMo/CoMoP Electrocatalyst for Highly Efficient and Stable Overall Water Splitting

Zheng

Liu

et al. 2022

Inorg. Chem.

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Finding reservoir-rich and efficient bifunctional electrocatalysts for water splitting is key to further sustainable energy development. Transition metal phosphides (TMPs) are extensively exploited as effective electrocatalysts, but the construction of strong coupling interfaces to improve catalytic performance by simple methods is still a bottleneck. Here, we designed and prepared a novel heterostructure electrocatalyst composed of cobalt–molybdenum (CoMo) alloy particles integrated with CoMoP nanosheets via the method of template-assisted conversion, followed by electrodeposition. Thanks to the strong interfacial coupling and synergistic effect between CoMo alloy particles and CoMoP nanosheets, the prepared CoMo/CoMoP/NF shows outstanding activity with overpotentials of only 29 mV for the hydrogen evolution reaction (HER) and 246 mV for the oxygen evolution reaction (OER) in 1 M KOH at a current density of 10 mA cm–2. Furthermore, the assembled CoMo/CoMoP || CoMo/CoMoP electrode can attain 10 mA cm–2 with a low battery voltage of 1.54 V. This study offers a valuable reference to the construction of bimetallic alloy/bimetallic phosphide heterostructure electrocatalysts, which applies to the large-scale application of electrocatalytic energy conversion technology.

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Section: Resultsmentioning

confidence: 76%

Synergistically Coupled CoMo/CoMoP Electrocatalyst for Highly Efficient and Stable Overall Water Splitting

Zheng

Liu

et al. 2022

Inorg. Chem.

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“…The band from 1719 cm −1 ascribed to the amide C=O stretching vibration is seen in all the nitrogen-doped samples, and this is related with the COOH groups located at the graphene oxide margins [ 19 , 20 ]. The GrFoam-doped samples present several C-N and N-H vibration modes, i.e., C-N stretching, N-H bending, N-H wagging, and O=C-N bending, corresponding to 1240 cm −1 , 929 cm −1 , 663 cm −1 , and 537 cm −1 , respectively [ 14 , 41 ]. The N-H wagging and O=C-N bending bands were shifted to 666 cm −1 and 584 cm −1 , respectively, for the GrFoam1NPt sample due to the Pt interaction with the GrFoam1N structure.…”

Section: Resultsmentioning

confidence: 99%

“…According to the Equation (2), during an electrochemical water reduction two electrons are necessary to produce hydrogen gas at the cathode. Depending on the material catalytic activity of the electrode, the HER takes place through two mechanisms, Volmer–Heyrovsky and Volmer–Tafel, as follows [ 41 ]:

…”

Section: Hydrogen Evolution Reaction (Her)mentioning

confidence: 99%

Nitrogen Functionalization of CVD Grown Three-Dimensional Graphene Foam for Hydrogen Evolution Reactions in Alkaline Media

et al. 2021

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Three-dimensional graphene foam (3D-GrFoam) is a highly porous structure and sustained lattice formed by graphene layers with sp2 and sp3 hybridized carbon. In this work, chemical vapor deposition (CVD)—grown 3D-GrFoam was nitrogen-doped and platinum functionalized using hydrothermal treatment with different reducing agents (i.e., urea, hydrazine, ammonia, and dihydrogen hexachloroplatinate (IV) hydrate, respectively). X-ray photoelectron spectroscopy (XPS) survey showed that the most electrochemically active nitrogen-doped sample (GrFoam3N) contained 1.8 at % of N, and it exhibited a 172 mV dec−1 Tafel plot associated with the Volmer–Heyrovsky hydrogen evolution (HER) mechanism in 0.1 M KOH. By the hydrothermal process, 0.2 at % of platinum was anchored to the graphene foam surface, and the resultant sample of GrFoamPt yielded a value of 80 mV dec−1 Tafel associated with the Volmer–Tafel HER mechanism. Furthermore, Raman and infrared spectroscopy analysis, as well as scanning electron microscopy (SEM) were carried out to understand the structure of the samples.

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“…In addition, the catalytic effect of a single type of metal is limited, and the introduction of different types of metals to achieve bimetal synergy is an effective means [14]. Nevertheless, achieving a high degree of fusion between the doped metal and the precursor matrix is still a challenging task.…”

Section: Introductionmentioning

confidence: 99%

Dual-Metal Zeolitic Imidazolate Framework Derived Highly Ordered Hierarchical Nanoarrays on Self-Supported Carbon Fiber for Oxygen Evolution

Zhang

et al. 2022

Materials

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The construction of highly ordered hierarchical nanoarrays is crucial for obtaining effective transition metal carbon nanomaterial electrocatalysts for oxygen evolution reaction (OER) in water splitting. Herein, we adopted a Co metal zeolitic imidazolate framework (Co-ZIF) as a precursor by ion-exchange/etching reaction with Fe(NO3)3 to obtain hierarchical N-doped Co-Fe layered double hydroxide (CoFe-LDH) in situ generated in Co-ZIF nanoarrays based on a self-supported carbon cloth (CC) substrate noted as CoFe-LDH@Co-ZIF@CC. Benefiting from the synergistic effect of these species and their highly ordered self-supported nanoarray structure, the catalytic active sites were fully exposed and highly protected in alkaline electrolyte, which significantly promoted electron transport and improved electrochemical performance. The CoFe-LDH@Co-ZIF@CC exhibited the low overpotentials of about 225 and 319 mV at 10 and 100 mA cm−2 with a small Tafel slope of 81.8 mV dec−1 recorded in a 1.0 M KOH electrolyte. In addition, it also showed a long-term durability without obvious decay after 30 h. Therefore, its remarkable OER activity demonstrates this material’s promising application in the green hydrogen energy industry.

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Bimetallic Co-Based (CoM, M = Mo, Fe, Mn) Coatings for High-Efficiency Water Splitting

Cited by 22 publications

References 59 publications

Synergistically Coupled CoMo/CoMoP Electrocatalyst for Highly Efficient and Stable Overall Water Splitting

Synergistically Coupled CoMo/CoMoP Electrocatalyst for Highly Efficient and Stable Overall Water Splitting

Nitrogen Functionalization of CVD Grown Three-Dimensional Graphene Foam for Hydrogen Evolution Reactions in Alkaline Media

Dual-Metal Zeolitic Imidazolate Framework Derived Highly Ordered Hierarchical Nanoarrays on Self-Supported Carbon Fiber for Oxygen Evolution

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