Highly efficient hydrogen evolution of platinum <i>via</i> tuning the interfacial dissolved-gas concentration

Zhao, Xu; Ranaweera, Ruchiranga; Luo, Long

doi:10.1039/c8cc08803a

Cited by 29 publications

(22 citation statements)

References 38 publications

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“…102,130 However, when a second phase appears in the form of bubbles on or near the electrodes, they will continue to grow as the dissolved gases diffuse from the electrolyte, reducing the supersaturation of products in the electrolyte which again disturbs the equilibrium towards the products, ultimately reducing the concentration overpotential. 103,131,132,133 A recent study has shown the decoupling the concentration potential from the ohmic and activation by introducing superhydrophobic pits surrounded by a ring shaped microelectrode. Bubbles preferentially nucleated on these hydrophobic sites, preventing the masking of the electrocatalytic area and in consequence removing completely their effect on the kinetic overpotential and significantly the ohmic overpotential.…”

Section: Bubble Effects On Concentration Overpotentialmentioning

confidence: 99%

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

Angulo

Linde

Gardeniers

et al. 2020

Joule

523

374

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Bubbles are known to influence energy and mass transfer in gas evolving electrodes. However, we lack a detailed understanding on the intricate dependencies between bubble evolution processes and electrochemical phenomena.This review discusses our current knowledge on the effects of bubbles on electrochemical systems with the aim to identify opportunities and motivate future research in this area. We first provide a base background on the physics of bubble evolution as it relates to electrochemical processes. Then we outline how bubbles affect energy efficiency of electrode processes, detailing the bubble-induced impacts on activation, ohmic and concentration overpotentials.Lastly, we describe different strategies to mitigate losses and how to exploit bubbles to enhance electrochemical reactions. Context & ScaleElectrochemical reactors will play a key role in the electrification of the chemical industry and can enable the integration of renewable electricity sources with chemical manufacturing. Most large-scale industrial electrochemical processes, including chloro-alkali and aluminum production, involve gas evolving electrodes. The evolution of bubbles at the surface of redox reaction sites often lead to the reduction of the active electrode area, the increase of ohmic resistance in the electrolyte and the formation of undesirable concentration gradients. All of these effects result in energy losses which reduce the efficiency of electrochemical systems. This review synthesizes our current understanding on the relationship between bubble evolution and energy losses in electrochemical reactors. By presenting a thorough account on the state of the research in this area, we aim to provide a common ground for the research community to improve our understanding on the complex processes involved in multiphase electrochemical systems. Increasing our knowledge on the relationship between bubbles and electrochemistry will lead to new strategies to mitigate and exploit bubble-induced phenomena leading to design guidelines for high-performing electrochemical reactors.

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Section: Bubble Effects On Concentration Overpotentialmentioning

confidence: 99%

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

Angulo

Linde

Gardeniers

et al. 2020

Joule

523

374

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“…After galvanostatic tests for 1500 s, the ECSA for CFPS‐Pt dropped by 11.6 %, whereas a substantial loss of 16.5 % in ECSA was observed for pure Pt. This result shows CFPS did not cause any significant loss of active surface area‐instead, it slowed down the surface deactivation, which should be a result of the electrostatic repulsion between CFPS and positively charged Pt surface during HzOR . These results indicate the effective exposure of active sites during hydrazine oxidation with the modulation of CFPS.…”

Section: Figurementioning

confidence: 99%

Lowering Interfacial Dissolved Gas Concentration for Highly Efficient Hydrazine Oxidation at Platinum by Fluorosurfactant Modulation

et al. 2019

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Regulating the dissolved‐gas concentration at the electrode‐solution interface represents a promising universal strategy to achieve high efficiency towards gas evolution reactions. Here, we present a facile method to modulate the interfacial dissolved‐gas concentration using cationic fluorinated pyridinium sulfonate (CFPS) for highly efficient hydrazine oxidation (HzOR). We found that the interfacial dissolved‐nitrogen concentration was effectively lowered by the cationic surfactant CFPS, while CFPS still ensured a sufficient exposure of the active sites during the HzOR. As a result, relative to pure Pt, the CFPS‐modulated Pt exhibited a 2.1‐fold higher current density and a lower overpotential for HzOR. This work presents a new avenue to achieve highly efficient hydrazine oxidation through regulating the interfacial gas concentration.

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“…Heptadecafluorooctancesulfonic acid potassium (PFOS) is used as the surfactant in this study since it does not participate in the electrochemical reaction and can reduce the overpotential by lowering hydrogen dissolution in the electrolyte. 59 Fig. 5a shows bubble generation at j = 300 mA cm −2 and different flow rates.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, PFOS reduces the dissolved hydrogen concentration close to the electrode. 59 This leads to a lower concentration overpotential due to hydrogen supersaturation at the electrode surface. 60 As a result, the required potential for the reactions decreases at constant current densities as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

A membrane-less electrolyzer with porous walls for high throughput and pure hydrogen production

Hadikhani

Hashemi

Schenk

2021

Sustainable Energy Fuels

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Highly efficient hydrogen evolution of platinum via tuning the interfacial dissolved-gas concentration

Abstract: We present a facile perfluorooctanesulfonate-modulation strategy with a precisely controlled dissolved-gas concentration at the electrode/gas/electrolyte interface for enhanced HER.

Cited by 29 publications

References 38 publications

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

Lowering Interfacial Dissolved Gas Concentration for Highly Efficient Hydrazine Oxidation at Platinum by Fluorosurfactant Modulation

A membrane-less electrolyzer with porous walls for high throughput and pure hydrogen production

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