Journal ArticleDOI
Electrocatalysis of the hydrogen evolution reaction by nanocomposites of poly(amidoamine)-encapsulated platinum nanoparticles and phosphotungstic acid
TLDR
In this article, the hydrogen evolution reaction (HER) was used to test electrocatalytic activities of these nanocomposite modified electrodes, which was attributed to an interaction between these species.Abstract:
Poly(amidoamine) dendrimer (Generation-4) encapsulated platinum nanoparticles (PtNP-PAMAM) were prepared and used to fabricate nanocomposites with Keggin-type phosphotungstic acid (PW12O403−) using a layer by layer electrostatic assembly technique. Indium tin oxide (ITO) electrodes, which were first modified with a monolayer of 3-aminopropyl triethoxysilane (3-APTES), were used as substrates for assembly of the PW12O403− monolayer. Nanocomposites were then fabricated by depositing PtNP-PAMAM on the monolayer of PW12O403−. The amount of PtNP-PAMAM deposited was controlled by using different concentrations of PtNP-PAMAM diluted in 0.1 M H2SO4 solution. The hydrogen evolution reaction (HER) was used to test electrocatalytic activities of these nanocomposite modified electrodes. Modification of ITO|3-APTES with PW12O403− |PtNP-PAMAM showed significantly higher electrocatalytic activities toward the HER than electrodes modified with either PW12O403− or PtNP-PAMAM alone. The electrocatalytic activities were found to depend on the composition of PtNP-PAMAM and PW12O403− on electrode surfaces, which was attributed to an interaction between these species. Heat treatment of ITO|3-APTES|PW12O403− |PtNP-PAMAM electrodes at 200 °C produced significantly higher electrocatalytic activities, which supported the suggestion of an interaction.read more
Citations
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Journal ArticleDOI
Recent Trends and Perspectives in Electrochemical Water Splitting with an Emphasis on Sulfide, Selenide, and Phosphide Catalysts of Fe, Co, and Ni: A Review
Sengeni Anantharaj,Sivasankara Rao Ede,Kuppan Sakthikumar,Kannimuthu Karthick,Soumyaranjan Mishra,Subrata Kundu,Subrata Kundu +6 more
TL;DR: In this article, the hydrogen (H2) and oxygen (O2) fuel cell is the one with zero carbon emission and water as the only byproduct, which is essential to ensure higher life cycle and less decay in cell efficiency.
Journal ArticleDOI
Precision and correctness in the evaluation of electrocatalytic water splitting: revisiting activity parameters with a critical assessment
Sengeni Anantharaj,Sengeni Anantharaj,Sivasankara Rao Ede,Sivasankara Rao Ede,Kannimuthu Karthick,Kannimuthu Karthick,Selvasundarasekar Sam Sankar,Selvasundarasekar Sam Sankar,Kumaravel Sangeetha,Kumaravel Sangeetha,Pitchiah Esakki Karthik,Subrata Kundu,Subrata Kundu +12 more
TL;DR: In this paper, the authors have discussed the use and validity of ten important parameters, namely overpotential at a defined current density, iR-corrected over-potential, Tafel slope, exchange current density (j0), mass activity, specific activity, faradaic efficiency (FE), turnover frequency (TOF), electrochemically active surface area (ECSA), and measurement of double layer capacitance (Cdl) for different electrocatalytic materials that are frequently employed in both oxygen evolution reaction (OER) and HER.
Journal ArticleDOI
Morphological Control of Catalytically Active Platinum Nanocrystals
TL;DR: Colloidal metallic nanocrystals, which are the most widely used surface-regulating polymers in shapednanoparticle synthesis, could serve as ideal surface-stabilizing agents that can regulate the shape of nanoparticles while preserving catalytically active sites.
Journal ArticleDOI
Controlled Growth of Pt Nanowires on Carbon Nanospheres and Their Enhanced Performance as Electrocatalysts in PEM Fuel Cells
Journal ArticleDOI
Ultrathin S-doped MoSe2 nanosheets for efficient hydrogen evolution
TL;DR: In this paper, the synthesis of ultrathin S-doped MoSe2 nanosheets demonstrating enhanced HER catalysis with a low onset overpotential of 90 mV and a Tafel slope of 58 mV per decade.
References
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