Overall design of novel 3D-ordered MEA with drastically enhanced mass transport for alkaline electrolyzers

Wan, Lei; Xu, Ziang; Xu, Qin; Wang, Peican; Wang, Baoguo

doi:10.1039/d2ee00273f

Cited by 78 publications

(77 citation statements)

References 44 publications

(50 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Albeit the cell performance of pure water-fed AEMWE has reached a decent level, its stability is still a long way from being practical. − A large body of literature has focused on feeding electrolytes in AEMWE, but limited work has investigated the stability of the pure water-fed mode. − To date, the longest AEMWE stability is reported by Meroueh et al Their AEMWE using a commercial Sustainion anion exchange membrane (AEM) ran for over 10,000 h at 1 M KOH . Comparing with pure water-fed mode, the addition of KOH as the electrolyte imposes higher requirements on the stability of the cell assembly due to KOH corrosion and thus could increase the maintenance cost. , The negative effects of KOH can be mitigated when using a less corrosive carbonate solution.…”

Section: Introductionmentioning

confidence: 99%

“…Different from introducing additional electrolyte solutions, pure water-fed AEMWE only uses an alkaline polymer as the electrolyte, which can eliminate the negative effects of liquid electrolytes but tends to show poor durability. − ,, Recently, Wang et al improved a pure water-fed AEMWE with a special cell structure by constructing a 3D-ordered membrane electrode assembly (MEA) . Due to the stable and orderly MEA structure, the pure water-fed AEMWE maintained 600 h at 1 A cm –2 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Catalyst Reconstruction on the Durability of Anion Exchange Membrane Water Electrolysis

Lei

Yang

Wang

et al. 2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Anion exchange membrane water electrolysis (AEMWE) offers an opportunity to use inexpensive nonprecious metal catalysts. However, pure water-fed AEMWE still faces issues of durability. Herein, we compared the stability of AEMWE under different anolytes, including KOH, pure water, and a phosphate buffer (PB) using a NiFeCo oxygen evolution reaction catalyst. Upon thoroughly characterizing several changes before/after 100 h durability tests, such as the cell performance, catalyst dissolution, catalyst morphologies, impedance of the anion exchange membrane, and catalytic layer, we speculate that the change of the local pH is the main factor causing catalyst reconstruction, which further leads to the loss of cell performance in the pure water-fed mode. By using PB to control the local pH, the morphology of the catalyst will no longer change after the durability test, and the cell performance can recover to the initial performance in pure water. These results not only indicate that the catalyst structural transformation is the main reason for the deactivation of pure water-fed AEMWE but also help find a way to achieve highly durable pure water-fed AEMWE.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Catalyst Reconstruction on the Durability of Anion Exchange Membrane Water Electrolysis

Lei

Yang

Wang

et al. 2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Therefore, the development and application of low‐carbon or zero‐carbon energy have become a priority. Hydrogen energy, as a kind of renewable energy, has the advantages of rich sources, environmental friendliness, and high energy density 6–9 . However, to date, the majority of hydrogen energy is derived from natural gas reforming and coal gasification, both of which emit carbon oxides 10–12 .…”

Section: Introductionmentioning

confidence: 99%

“…Hydrogen energy, as a kind of renewable energy, has the advantages of rich sources, environmental friendliness, and high energy density. [6][7][8][9] However, to date, the majority of hydrogen energy is derived from natural gas reforming and coal gasification, both of which emit carbon oxides. [10][11][12] Besides, the produced hydrogen has low purity and needs further purification for further utilization.…”

Section: Introductionmentioning

confidence: 99%

Layered double hydroxide composite membrane for advanced alkaline water electrolysis

Yang

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary The development of alkaline membranes with high conductivity and stability is a significant challenge for the commercial application of advanced alkaline water electrolysis. In this study, a novel anion exchange membrane (AEM) was fabricated by quaternary ammonium poly (n‐methyl‐piperidine‐co‐p‐terphenyl) (QAPPT) and Ni‐Fe layered double hydroxide (LDH) synthesis for advanced alkaline water electrolysis. The uniform dispersion of Ni‐Fe LDH in the QAPPT/Ni‐Fe LDH composite membrane was confirmed by scanning electron microscopy, showing that Ni‐Fe LDH provides the composite membrane with high OH− conductivity and tensile strength. Among different membrane samples, the QAPPT/3% Ni‐Fe LDH composite membrane exhibited the best conductivity with 217.6 mS cm−1 at 80°C. Furthermore, the QAPPT/3% Ni‐Fe LDH composite membrane showed outstanding electrolysis performance of 1 A cm−2 at the voltage of 1.824 V at 60°C. According to a long‐term stability test, conducted at 500 mA cm−2 for more than 87 h, the QAPPT/3% Ni‐Fe LDH composite membrane achieved satisfactory electrolysis voltage. This study's results show that QAPPT/Ni‐Fe LDH composite membranes have excellent application prospects in advanced alkaline water electrolysis.

show abstract

“…Ohmic loss is associated with the ionic/electronic transport and contact resistance in cell components . Efforts on the reduction of ohmic polarization are mainly focused on the facilitation of ionic or electronic transport by decreasing the thickness of the proton exchange membrane (PEM) ,, or by constructing interconnected electric conductors such as nanoporous metals. , Nevertheless, the structure of the PEM/CL interface, which is supposed to not only reduce the ionic transport and contact resistance but also improve the stability of the PEM/CL interface, has attracted insufficient attention . Importantly, for the PEMWE running at high current density, mass transport is restricted by the structure of the CL and PEM/CL interface.…”

mentioning

confidence: 99%

Overall Design of Anode with Gradient Ordered Structure with Low Iridium Loading for Proton Exchange Membrane Water Electrolysis

et al. 2022

View full text Add to dashboard Cite

Insufficient catalyst utilization, limited mass transport, and high ohmic resistance of the conventional membrane electrode assembly (MEA) lead to significant performance losses of proton exchange membrane water electrolysis (PEMWE). Herein we propose a novel ordered MEA based on anode with a 3D membrane/catalytic layer (CL) interface and gradient tapered arrays by the nanoimprinting method, confirmed by energy dispersive spectroscopy. Benefiting from the maximized triple-phase interface, rapid mass transport, and gradient CL by overall design, such an ordered structure with Ir loading of 0.2 mg cm–2 not only greatly increases the electrochemical active area by 4.2 times but also decreases the overpotentials of both mass transport and ohmic polarization by 13.9% and 8.7%, respectively, compared with conventional MEA with an Ir loading of 2 mg cm–2, thus ensuring a superior performance (1.801 V at 2 A cm–2) and good stability. This work provides a new strategy of designing MEA for high-performance PEMWE.

show abstract

Overall design of novel 3D-ordered MEA with drastically enhanced mass transport for alkaline electrolyzers

Abstract: The generation of hydrogen via alkaline electrolyzers is a promising approach to address the severe energy crisis. However, alkaline electrolyzers with alkaline electrolytes or pure water suffer from poor performance...

Cited by 78 publications

References 44 publications

Impact of Catalyst Reconstruction on the Durability of Anion Exchange Membrane Water Electrolysis

Impact of Catalyst Reconstruction on the Durability of Anion Exchange Membrane Water Electrolysis

Layered double hydroxide composite membrane for advanced alkaline water electrolysis

Overall Design of Anode with Gradient Ordered Structure with Low Iridium Loading for Proton Exchange Membrane Water Electrolysis

Contact Info

Product

Resources

About