MoS2-based materials as alternative cathode catalyst for PEM electrolysis

Corrales-Sánchez, Tachmajal; Ampurdanés, Jordi; Urakawa, Atsushi

doi:10.1016/j.ijhydene.2014.08.078

Cited by 77 publications

(56 citation statements)

References 32 publications

(39 reference statements)

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“…ed reports of PEMe lectrolyzers that utilize non-precious catalysts at the H 2 electrode. [6,15] Herein,w er eport progress in that direction, first in developing three distinct Mo-based catalysts supported on carbon black (CB), namely MoS x -CB, Mo 3 S 13 -CB, and MoP j S-CB, and then in incorporating these device-ready catalysts into PEM electrolyzers. The synthetic routes available to these catalysts are both facile and scalable, making them viable contenders to replace commercial Pt as HER catalysts for PEM electrolyzers on at erawatt scale.…”

Section: Introductionmentioning

confidence: 99%

Polymer Electrolyte Membrane Electrolyzers Utilizing Non‐precious Mo‐based Hydrogen Evolution Catalysts

Hellstern

Kibsgaard

et al. 2015

ChemSusChem

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The development of low-cost hydrogen evolution reaction (HER) catalysts that can be readily integrated into electrolyzers is critical if H2 from renewable electricity-powered electrolysis is to compete cost effectively with steam reforming. Herein, we report three distinct earth-abundant Mo-based catalysts, namely those based on MoSx , [Mo3 S13 ](2-) nanoclusters, and sulfur-doped Mo phosphide (MoP|S), loaded onto carbon supports. The catalysts were synthesized through facile impregnation-sulfidization routes specifically designed for catalyst-device compatibility. Fundamental electrochemical studies demonstrate the excellent HER activity and stability of the Mo-sulfide based catalysts in an acidic environment, and the resulting polymer electrolyte membrane (PEM) electrolyzers that integrate these catalysts exhibit high efficiency and durability. This work is an important step towards the goal of replacing Pt with earth-abundant catalysts for the HER in commercial PEM electrolyzers.

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Section: Introductionmentioning

confidence: 99%

Polymer Electrolyte Membrane Electrolyzers Utilizing Non‐precious Mo‐based Hydrogen Evolution Catalysts

Hellstern

Kibsgaard

et al. 2015

ChemSusChem

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“…The reason is partially that the exchange current density of H + /H 2 on Pt is almost 1000 times larger than that of H 2 O/O 2 on Ir [82], and Ir is also more precious than Pt, therefore research has been mainly focused on how to reduce the cost and increase the efficiency of OER catalyst. However, as the cathode side also contributes to a large extent in the cost of a PEM electrolyzer, it is necessary and important to reduce the loading of Pt [83], or replace it with efficient earth abundant electrocatalysts, such as MoS 2 [84] or CoP [85]. This effort is briefly summarized below and as we set out earlier, our main target is to document actual application of EACs in full PEM WE cells.…”

Section: State-of-the-art Devicesmentioning

confidence: 99%

“…The 1T phase is metastable, however, the metallic nature makes it highly conductive compared to the 2H phase, and, in addition, the basal plane is active as well, resulting in promising HER activity [101,102]. For more in-depth reviews the reader is referred to a number of reviews [84,89,103,104]. Despite all these efforts to improve the catalytic properties over the past decade, there are, to the best of our knowledge, only the following few reports on molybdenum sulfide-based cathodes implemented in a PEM cell.…”

Section: Molybdenum Sulfide Mosmentioning

confidence: 99%

“…In 2014, Corrales-Sánchez et al were the first to report the performance of a PEM cell using MoS 2 -based cathodes [84]. They reported the performance of three different types of MoS 2 -based electrodes, bare pristine MoS 2 , MoS 2 mixed with commercial conductive carbon, Vulcan ® XC72, and MoS 2 nanoparticles on reduced graphene oxide.…”

Section: Molybdenum Sulfide Mosmentioning

confidence: 99%

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Earth-Abundant Electrocatalysts in Proton Exchange Membrane Electrolyzers

Sun

Fleischer

et al. 2018

Catalysts

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In order to adopt water electrolyzers as a main hydrogen production system, it is critical to develop inexpensive and earth-abundant catalysts. Currently, both half-reactions in water splitting depend heavily on noble metal catalysts. This review discusses the proton exchange membrane (PEM) water electrolysis (WE) and the progress in replacing the noble-metal catalysts with earth-abundant ones. The efforts within this field for the discovery of efficient and stable earth-abundant catalysts (EACs) have increased exponentially the last few years. The development of EACs for the oxygen evolution reaction (OER) in acidic media is particularly important, as the only stable and efficient catalysts until now are noble-metal oxides, such as IrOx and RuOx. On the hydrogen evolution reaction (HER) side, there is significant progress on EACs under acidic conditions, but there are very few reports of these EACs employed in full PEM WE cells. These two main issues are reviewed, and we conclude with prospects for innovation in EACs for the OER in acidic environments, as well as with a critical assessment of the few full PEM WE cells assembled with EACs.

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“…6 Applications of MoS 2 include, but are not limited to, photocatalysis due to its solar active band gap of approximately 1.2-1.7 eV, 7-9 catalytic reduction of contaminants, 10 hydrodesulfurization (HDS) catalysis of sulfur containing compounds in petroleum products, [11][12][13][14] and electrocatalysis of water for the production of hydrogen gas. [15][16][17][18][19] The electrocatalytic ability of MoS 2 to generate H 2 was discovered in the 1970's. 20 More recently, 2H-MoS 2 nanoparticles were proposed as an effective hydrogen evolution reaction (HER) electrocatalyst based on rst-principles calculations that suggested hydrogen binding at Mo-S sites was nearly thermoneutral.…”

Section: Introductionmentioning

confidence: 99%

Stability of 2H- and 1T-MoS₂ in the presence of aqueous oxidants and its protection by a carbon shell

et al. 2020

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Two-dimensional molybdenum disulfide (MoS 2 ) is emerging as a catalyst for energy and environmental applications. Recent studies have suggested the stability of MoS 2 is questionable when exposed to oxidizing conditions found in water and air. In this study, the aqueous stability of 2H-and 1T-MoS 2 and 2H-MoS 2 protected with a carbon shell was evaluated in the presence of model oxidants (O 2 , NO 2 À , BrO 3 À ). The MoS 2 electrocatalytic performance and stability was characterized using linear sweep voltammetry and chronoamperometry. In the presence of dissolved oxygen (DO) only, 2H-and 1T-MoS 2 were relatively stable, with SO 4 2À formation of only 2.5% and 3.1%, respectively. The presence of NO 2 À resulted in drastically different results, with SO 4 2À formations of 11% and 14% for 2H-and 1T-MoS 2 , respectively. When NO 2 À was present without DO, the 2H-and 1T-MoS 2 remained relatively stable with SO 4 2À formations of only 4.2% and 3.3%, respectively. Similar results were observed when BrO 3 À was used as an oxidant. Collectively, these results indicate that the oxidation of 2H-and 1T-MoS 2 can be severe in the presence of these aqueous oxidants but that DO is also required. To investigate the ability of a capping agent to protect the MoS 2 from oxidation, a carbon shell was added to 2H-MoS 2 . In a batch suspension in the presence of DO and NO 2 À , the 2H-MoS 2 with the carbon shell exhibited good stability with no oxidation observed. The activity of 2H-MoS 2 electrodes was then evaluated for the hydrogen evolution reaction by a Tafel analysis. The carbon shell improved the activity of 2H-MoS 2 with a decrease in the Tafel slope from 451 to 371 mV dec À1 . The electrode stability, characterized by chronopotentiometry, was also enhanced for the 2H-MoS 2 coated with a carbon shell, with no marked degradation in current density observed over the reaction period. Because of the instability exhibited by unprotected MoS 2 , it will only be a useful catalyst if measures are taken to protect the surface from oxidation. Further, given the propensity of MoS 2 to undergo oxidation in aqueous solutions, caution should be used when describing it as a true catalyst for reduction reactions (e.g., H 2 evolution), unless proven otherwise. rsc.li/rsc-advances 9324 | RSC Adv., 2020, 10, 9324-9334This journal is Fig. 8 Chronoamperometry of 2H-MoS 2 and 2H-MoS 2 /C0.1 electrodes in the absence and presence of NO 2 À (7.14 mM). The applied potential was À0.5 V vs. RHE. Samples were degassed with N 2 prior to measurement. The observed noise in current density is due to effects from stirring.9332 | RSC Adv., 2020, 10, 9324-9334This journal is

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MoS2-based materials as alternative cathode catalyst for PEM electrolysis

Abstract: Abstract

Cited by 77 publications

References 32 publications

Polymer Electrolyte Membrane Electrolyzers Utilizing Non‐precious Mo‐based Hydrogen Evolution Catalysts

Polymer Electrolyte Membrane Electrolyzers Utilizing Non‐precious Mo‐based Hydrogen Evolution Catalysts

Earth-Abundant Electrocatalysts in Proton Exchange Membrane Electrolyzers

Stability of 2H- and 1T-MoS₂ in the presence of aqueous oxidants and its protection by a carbon shell

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MoS2-based materials as alternative cathode catalyst for PEM electrolysis

Abstract: Abstract

Cited by 77 publications

References 32 publications

Polymer Electrolyte Membrane Electrolyzers Utilizing Non‐precious Mo‐based Hydrogen Evolution Catalysts

Polymer Electrolyte Membrane Electrolyzers Utilizing Non‐precious Mo‐based Hydrogen Evolution Catalysts

Earth-Abundant Electrocatalysts in Proton Exchange Membrane Electrolyzers

Stability of 2H- and 1T-MoS2 in the presence of aqueous oxidants and its protection by a carbon shell

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Stability of 2H- and 1T-MoS₂ in the presence of aqueous oxidants and its protection by a carbon shell