What is the HER overpotential value for Platinum?
Best insight from top research papers
The hydrogen evolution reaction (HER) overpotential value for Platinum (Pt) varies depending on the conditions. In a study on Pt(111) surfaces, the Tafel slope for the Volmer reaction at room temperature was found to be 120 mV/dec, while a change in Tafel slope occurred at around -η ≈ 50 mV for the overall reaction . Additionally, Pt/C electrodes were used in experiments to determine the effective charge of platinum available for the reaction, with the overpotential being evaluated at five different levels . Pt/C benchmarked against P-defected Rh2P nanoparticles, which showed a low overpotential of 4.3 mV at 10 mA cm−2 in alkaline HER, outperforming Pt/C .
Answers from top 5 papers
More filters
| Papers (5) | Insight |
|---|---|
48 Citations | At high current densities, Cr0.4Mo0.6B2 requires 180 mV less overpotential than Pt/C to achieve an 800 mA cm-2 current density, showcasing superior performance in the hydrogen evolution reaction. |
3 Citations | The paper discusses five different overpotentials for the Hydrogen Evolution Reaction (HER) on Pt/C electrodes, providing a range of values for the HER overpotential for Platinum. |
145 Citations | The HER overpotential value for Platinum was determined by calibrating the reference electrode with Pt foil in a three-electrode setup, yielding the thermodynamic potential from cyclic voltammograms. |
5 Citations | The HER overpotential value for Platinum on a Pt(111) surface varies, with a change in Tafel slope at -η ≈ 50 mV, exhibiting 30 mV/dec for small overpotentials and 120 mV/dec for larger overpotentials. |
| The HER overpotential value for Platinum is outperformed by P-defected Rh2P with an overpotential of only 4.3 mV in alkaline electrolyte, as per the research findings. |
Related Questions
What is the HER value for Platinum?5 answersThe turnover frequency (TOF) for Platinum (Pt) in the hydrogen evolution reaction (HER) has been highlighted as a crucial metric for assessing intrinsic catalytic activity. While the highest TOF for Pt at room temperature has been reported, the true intrinsic HER activity for Pt in acid remains unknown due to limitations related to mass transport. Additionally, studies have shown that mutation signatures of homologous recombination deficiency (HRD) can impact platinum response in various cancers, including breast cancer, emphasizing the importance of understanding these signatures for predicting treatment outcomes. Furthermore, patient-derived xenograft (XPDX) models have been utilized to characterize platinum sensitivity in different cancer types, revealing varying responses and the need for effective therapies in platinum-resistant cancers.
What is the lowest overpotential reported for Fe-based OER catalysts?5 answersThe lowest overpotential reported for Fe-based OER catalysts is 122 mV.
What is the energy value of hydrogen?5 answersHydrogen has a high energy value and can be converted between chemical and electrical energy efficiently and cleanly. It also has the potential for long-term storage and high energy density. Hydrogen can be obtained from a wide range of primary energy sources and can be used in various applications, including decentralized systems without emitting CO2. Fuel cell technology is crucial for harnessing the rare benefits of hydrogen as an energy resource. The use of hydrogen fuel cells in mobile applications, as well as in the industrial and tertiary sectors, can significantly reduce greenhouse gas emissions. The cost of renewable energy technologies has reached a tipping point, leading to increased interest in renewable hydrogen production through water splitting. Hydrogen has the potential to be a technically feasible and environmentally friendly energy vector for various applications.
What is overpotential in electrolysis?5 answersOverpotential in electrolysis refers to the extra energy needed to force an electrode reaction to proceed at a required rate, beyond its equilibrium potential. It represents the difference between the operating potential of an electrode and its equilibrium potential when a current is flowing. The overpotential can be described in terms of the electrode potential and is influenced by factors such as current density, additive, anode quality, and electrolyte temperature. In the case of polymer electrolyte electrolyzers, the cell voltage does not always show the expected thermodynamic voltage increase at high pressures. This is because beneficial influences, such as improved kinetics and mass transport, compensate for the compression work, resulting in higher faradaic losses due to increased gas crossover. The deposition overpotential in copper electrolysis determines the copper crystallization grain degree and is a key factor in controlling cathodic overpotential in high current electrolytic processes.
What could affect overpotential of oxygen evolution reaction?4 answersThe overpotential of the oxygen evolution reaction (OER) can be affected by several factors. One factor is the presence of surface defects, which can introduce half-metallicity into semiconductors and enhance OER activity. Another factor is the stability of transition-metal compounds under acidic conditions, as the solubility of these compounds can impact OER performance. Additionally, the composition and structure of the electrode material can influence OER overpotential. For example, the deposition of a Ni underlayer, Sn whiskers, and a Ni protection layer on a metal mesh can lead to low overpotential and decreased resistance in the OER electrode. Furthermore, the presence of neutral oxygen vacancies in semiconductor oxides can affect OER overpotential by altering the binding of adsorbates to the surface. Finally, the chemical stoichiometry and bond characteristics of iridium oxides can also impact OER performance.
What's the price of copper right now?16 answers