Insight into the hydrogen oxidation electrocatalytic performance enhancement on Ni via oxophilic regulation of MoO2

Deng, Shaofeng; Liu, Xupo; Guo, Xuyun; Zhao, Tonghui; Lu, Yun; Cheng, Jingyu; Chen, Ke; Shen, Tao; Zhu, Ye; Wang, Deli

doi:10.1016/j.jechem.2020.05.066

Cited by 52 publications

(31 citation statements)

References 40 publications

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“…Inspired by the superior catalysis performance of the Mo-Ni combination in HER, Wang's group reported a Ni-MoO 2 heterostructure with enhanced HOR performance (Figure 9a). [99] The function of MoO 2 in facilitating OH adsorption thus accelerate the HOR process was confirmed by the CO striping experiment on Pt-MoO 2 .…”

Section: Synergistic Guest-host Interaction For Hydrogen Oxidation Reactionmentioning

confidence: 79%

“…Molybdenum disulfide (MoS 2 ) holds a near-optimal hydrogen adsorption free energy similar to Pt is regarded as a promising a) Reproduced with permission. [99] Copyright 2021, Elsevier B.V. b) Reproduced with permission. [100] Copyright 2020, American Chemical Society.…”

Section: Synergistic Heterostructure For Hydrogen Evolution Reactionmentioning

confidence: 99%

“…Figure 9. a) Scheme for the Ni/MoO 2 heterostructure catalyzing HOR. b) Free energy diagrams of the elementary processes of HOR on Ru and RuNi 1 .a) Reproduced with permission [99]. Copyright 2021, Elsevier B.V. b) Reproduced with permission [100].…”

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confidence: 99%

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Synergistic Electrocatalysts for Alkaline Hydrogen Oxidation and Evolution Reactions

Tang

Ding

Yao

et al. 2021

Adv Funct Materials

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Alkaline water electrolyzers (AWEs) and anion-exchange membrane fuel cells (AEMFCs) have received increasing attention for their natural compatibility with earth-abundant materials and are regarded as the cutting-edge of hydrogen energy techniques and the research focuses. However, the commercialization of these devices remains in the sluggish hydrogen electrode reactions due to the requirement of cooperative adsorption of both hydrogen species and hydroxyl species. The research on synergistic alkaline hydrogen oxidation/evolution reaction (HOR/HER) electrocatalysts is still in its infancy. This review summarizes the recent progress and strategies in constructing synergistic active sites for advancing alkaline HOR/HER electrocatalysts. The fundamentals of alkaline HOR/HER are first introduced with both theoretical and experimental verifications to rationalizing the necessity of constructing synergistic active sites. Then, this review systemically dissects the functionality of different active sites in recently reported innovative HOR/HER catalysts and introduces the synergistic effects. Finally, some perspectives on the challenges and opportunities for the future design and synthesis of the synergistic HOR and HER electrocatalysts are proposed, intending to promote the application of hydrogen-based energy conversion systems.

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Section: Synergistic Guest-host Interaction For Hydrogen Oxidation Reactionmentioning

confidence: 79%

Section: Synergistic Heterostructure For Hydrogen Evolution Reactionmentioning

confidence: 99%

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Synergistic Electrocatalysts for Alkaline Hydrogen Oxidation and Evolution Reactions

Tang

Ding

Yao

et al. 2021

Adv Funct Materials

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“…[371] The catalyst support could also play an important role in enhancing the HOR activity of Ni. [372][373][374][375] Zhuang et al [372] revealed that Ni particles supported on N-doped carbon nanotubes (Ni/N-CNTs) showed more than 20 times higher exchange current density than unsupported one in 0.1 m NaOH. The best non-PGM electrocatalyst for HOR so far is Ni 3 N-based.…”

Section: Pgm-free Electrocatalystsmentioning

confidence: 99%

Recent Advances in Electrocatalysts for Proton Exchange Membrane Fuel Cells and Alkaline Membrane Fuel Cells

et al. 2021

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kinetics of ORR is around five orders of magnitude slower than that of HOR, thereby requiring a much higher Pt loading in the cathode along with more active and durable ORR electrocatalysts than pure Pt catalysts. [1] This requirement presents challenges for the development of advanced cathode catalysts with lower cost, higher activity and higher durability than Pt. Meanwhile, traditional alkaline fuel cells (AFCs) working on concentrated 30−45% KOH electrolytes gained little attention for decades mainly due to their high sensitivity to atmospheric CO 2 . [2,3] The OH − ions in the electrolyte react with CO 2 and form K 2 CO 3 , which can precipitate out as solid crystals, blocking pores in the electrode and gas diffusion layer. In addition, the consumption of OH − reduces the conductivity of the electrolyte. This issue is addressed by replacing KOH solution with a solid anion exchange membrane (AEM) without mobile cations. An AMFC offers several important advantages over PEMFCs, including: 1) low dissolution rates of catalysts, allowing the use of less expensive Pt-free electrocatalysts; 2) wide selections of materials and components that are stable at high pH; and 3) inexpensive solid electrolytes that do not need fluorinated ionomers. Despite their promise, AMFCs are still in the early development stage and have not been systematically investigated due to the lack of highly conductive and durable AEMs. The recent development of highly conductive The rapid progress of proton exchange membrane fuel cells (PEMFCs) and alkaline exchange membrane fuel cells (AMFCs) has boosted the hydrogen economy concept via diverse energy applications in the past decades. For a holistic understanding of the development status of PEMFCs and AMFCs, recent advancements in electrocatalyst design and catalyst layer optimization, along with cell performance in terms of activity and durability in PEMFCs and AMFCs, are summarized here. The activity, stability, and fuel cell performance of different types of electrocatalysts for both oxygen reduction reaction and hydrogen oxidation reaction are discussed and compared. Research directions on the further development of active, stable, and low-cost electrocatalysts to meet the ultimate commercialization of PEMFCs and AMFCs are also discussed.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202006292.

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“…Theoretical calculations performed with first-principle simulations predict that the engineering of Ru-O-Mo sites enhances H2O absorption. [25][26][27][28][29] We experimentally prepare Ru/MoO2 catalyst with paired Ru-O-Mo sites through a facile hydrothermal reaction with a pyrolysis process on a graphite carbon substrate (Figure 2a). Details on the manufacturing process are in the Supporting Information.…”

Section: Introductionmentioning

confidence: 99%

Paired Ru‒O‒Mo ensemble for efficient and stable alkaline hydrogen evolution reaction

Liu

et al. 2021

Nano Energy

105

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Electrocatalytic hydrogen evolution reaction (HER) in alkaline media is a promising electrochemical energy conversion strategy. Ruthenium (Ru) is an efficient catalyst with a desirable cost for HER, however, the sluggish H2O dissociation process, due to the low H2O adsorption on its surface, currently hampers the performances of this catalyst in alkaline HER. Herein, we demonstrate that the H2O adsorption improves significantly by the construction of Ru-O-Mo sites. We prepared Ru/MoO2 catalysts with Ru-O-Mo sites through a facile thermal treatment process and assessed the creation of Ru-O-Mo interfaces by transmission electron microscope (TEM) and extended X-ray absorption fine structure (EXAFS). By using Fourier-transform infrared spectroscopy (FTIR) and H2O adsorption tests, we proved Ru-O-Mo sites have tenfold stronger H2O adsorption ability than that of Ru catalyst. The catalysts with Ru-O-Mo sites exhibited a state-of-the-art overpotential of 16 mV at 10 mA cm -2 in 1 M KOH electrolyte, demonstrating a threefold reduction than the previous bests of Ru (59 mV) and commercial Pt (31 mV) catalysts. We proved the stability of these performances over 40 hours without decline. These results could open a new path for designing efficient and stable catalysts.

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Insight into the hydrogen oxidation electrocatalytic performance enhancement on Ni via oxophilic regulation of MoO2

Cited by 52 publications

References 40 publications

Synergistic Electrocatalysts for Alkaline Hydrogen Oxidation and Evolution Reactions

Synergistic Electrocatalysts for Alkaline Hydrogen Oxidation and Evolution Reactions

Recent Advances in Electrocatalysts for Proton Exchange Membrane Fuel Cells and Alkaline Membrane Fuel Cells

Paired Ru‒O‒Mo ensemble for efficient and stable alkaline hydrogen evolution reaction

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