In-situ investigation and modeling of electrochemical reactions with simultaneous oxygen and hydrogen microbubble evolutions in water electrolysis

Li, Yifan; Yang, Gaoqiang; Yu, Shule; Kang, Zhenye; Mo, Jinjun; Han, Bo; Talley, Derrick A.; Zhang, Fengyuan

doi:10.1016/j.ijhydene.2019.09.044

Cited by 78 publications

(31 citation statements)

References 39 publications

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“…In-situ observations of the whole process of hydrogen evolution reactions (HERs) and oxygen evolution reactions (OERs) on micro-bubbles, simultaneously studied, led to the finding that bubble detachment diameter is inversely proportional to the flow velocity, and directly proportional to the current density. 98 Similarly, with the use of high speed microscopy imaging in a transparent PEMEC, it was shown how the detachment diameter of oxygen bubbles increased with the operating current density. 72 Engineering the topology of the electrodes can also alter the detachment behavior of bubbles.…”

Section: Detachmentmentioning

confidence: 97%

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

Angulo

Linde

Gardeniers

et al. 2020

Joule

474

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: Detachmentmentioning

confidence: 97%

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

Angulo

Linde

Gardeniers

et al. 2020

Joule

474

374

View full text Add to dashboard Cite

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“…This dye is also used as an antifungal, anti-parasitic, and antibacterial agent in aquaculture. 7,8 Different treatment methods such as ion exchange, 9 coagulation/ flocculation, 10 chemical precipitation, 3 electrochemical reaction, 11 reverse osmosis, 12 membrane filtration, 13 advanced oxidation, 14 enzymatic degradation, 15,16 and adsorption 17,18 have been used to treat the dye-containing effluents. However, some of these mentioned methods have low efficiency and high cost, which make them inappropriate to be used by small-scale industries.…”

Section: Introductionmentioning

confidence: 99%

A novel functionalized chitosan nanoadsorbent for efficient elimination of malachite green from aqueous media

Tohidi

Chaibakhsh

Mohammadi

2020

Env Prog and Sustain Energy

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In this study, a novel chitosan‐based nanoadsorbent has been synthesized by the reaction between nanochitosan and epoxy‐triazinetrione. The commercial cationic dye, malachite green, was chosen as a model dye in order to inspect the adsorption efficiency of the prepared adsorbent. The kinetics and thermodynamics of the adsorption process have been explored. According to the results, the Freundlich isotherm and pseudo‐second‐order model can well elucidate the adsorption process. The obtained thermodynamic parameters indicated that the removal process was spontaneous and endothermic (ΔH° = 95.0 kJ mol−1). The effects of several parameters on the dye elimination were studied using the response surface methodology approach. A high adsorption efficiency (95%) was obtained at 29.5 min, pH 7.9, and 7.5 mg of the adsorbent. At this condition, the removal efficiency of the unmodified adsorbent was 65.4%. The novel epoxy‐triazinetrione‐modified chitosan nanosorbent was found to be highly adequate for the treatment of wastewaters containing organic dyes.

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“…In general, water electrolysis consists of metal electrodes at anode and cathode terminal, solution (electrolyte), and voltage, as shown in Figure 2. Platinum microelectrode with a sharp conical tip is commonly used to produce dispersed micro-nanobubbles (Hammadi et al 2013;Achaoui et al 2017), where the oxygen and hydrogen evolution reaction can be observed using a high-speed visualization camera system (Li et al 2018(Li et al , 2019.…”

Section: Micro-nanobubblesmentioning

confidence: 99%

A review on future wastewater treatment technologies: micro-nanobubbles, hybrid electro-Fenton processes, photocatalytic fuel cells, and microbial fuel cells

Selihin

Tay

2021

Water Science and Technology

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The future prospect in wastewater treatment technologies mostly emphasizes processing efficiency and the economic benefits. Undeniably, the use of advanced oxidation processes (AOPs) in physical and chemical treatments has played a vital role in helping the technologies to remove the organic pollutants efficiently and reduce the energy consumption or even harvesting the electrons movements in the oxidation process to produce electrical energy. In the present paper, we reviewed several types of wastewater treatment technologies, namely micro-nanobubbles, hybrid electro-Fenton processes, photocatalytic fuel cells, and microbial fuel cell. The aims are to explore the interaction of hydroxyl radicals with pollutants using these wastewater technologies, including their removal efficiencies, optimal conditions, reactor setup, and energy generation. Despite these technologies recorded high removal efficiency of organic pollutants, the selection of the technologies is dependent on the characteristic of the wastewater and the daily production volume. Hence the review paper also provides comparisons between technologies as the guidance in technology selection.

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In-situ investigation and modeling of electrochemical reactions with simultaneous oxygen and hydrogen microbubble evolutions in water electrolysis

Cited by 78 publications

References 39 publications

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

A novel functionalized chitosan nanoadsorbent for efficient elimination of malachite green from aqueous media

A review on future wastewater treatment technologies: micro-nanobubbles, hybrid electro-Fenton processes, photocatalytic fuel cells, and microbial fuel cells

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