Accelerating hydrogen evolution at neutral pH by destabilization of water with a conducting oxophilic metal oxide

Xie, Zhengguang; Wang, Wugang; Ding, Ding; Zou, Yu; Cui, Yi; Xu, Lai; Jiang, Jiang

doi:10.1039/d0ta04241b

Cited by 23 publications

(23 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure b shows the high-resolution Ni 2p spectra of Ni-MoO 3 for all of the annealed samples. The peaks located at 854.40, 871.49, 856.60, and 875.14 eV in all of the samples can be assigned to Ni 2+ 2p 3/2 , Ni 2+ 2p 1/2 , Ni 3+ 2p 3/2 , and Ni 3+ 2p 1/2 , respectively, , confirming the presence of Ni. For S400, the chemical valence states of Ni are similar to Ni-MoO 3 .…”

Section: Resultsmentioning

confidence: 58%

“…For S500 and S600, the new peaks appearing at 229.34, 233.19, 230.41, and 234.95 eV are assigned to Mo 4+ 3d 5/2 , Mo 4+ 3d 3/2 , Mo 5+ 3d 5/2 , and Mo 5+ 3d 3/2 , respectively. ,, This suggests the transformation of large amounts of Ni-MoO 3 to Ni-MoO 2 , consistent with the XRD results. In addition, two other weak peaks at 228.07 and 232.17 eV in S600 can be assigned to Mo 0 3d 5/2 and Mo 0 3d 3/2 , respectively, , implying the formation of metallic Mo in Ni-MoO 2 . As the temperature is increased up to 700 °C, the peaks at 228.07 and 232.17 eV corresponding to Mo 0 3d 5/2 and Mo 0 3d 3/2 become sharp, indicating the formation of large amounts of metallic Ni–Mo in S700, which is in accordance with the XRD results.…”

Section: Resultsmentioning

confidence: 95%

“…For S400, the chemical valence states of Ni are similar to Ni-MoO 3 . For S700, two new peaks at 852.86 and 870.13 eV are observed, which can be assigned to Ni 0 , , implying the formation of metallic Ni under high annealing temperature. Hence, the above results substantiate the different chemical valence states of Mo and Ni in Ni-MoO 3 and the annealed samples, thus confirming the successful preparation of molybdenum oxides with different oxidation states.…”

Section: Resultsmentioning

confidence: 96%

“…19,25,26 This suggests the transformation of large amounts of Ni-MoO 3 to Ni-MoO 2 , consistent with the XRD results. In addition, two other weak peaks at 228.07 and 232.17 eV in S600 can be assigned to Mo 0 3d 5/2 and Mo 0 3d 3/2 , respectively, 25,27 implying the formation of metallic Mo The HER activity of Ni-doped molybdenum oxides with different oxidation states was first evaluated in 1 M KOH. Figure 4a represents the linear sweep voltammetry (LSV) curves of all of the tested samples.…”

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Triggering the Intrinsic Catalytic Activity of Ni-Doped Molybdenum Oxides via Phase Engineering for Hydrogen Evolution and Application in Mg/Seawater Batteries

Yang

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Molybdenum oxides have been regarded as promising non-noble metal electrocatalysts for hydrogen evolution reaction (HER) due to their low cost, nontoxicity, and chemical stability. However, promoting the intrinsic catalytic activity of molybdenum oxides is crucial for achieving high HER performance. Herein, we demonstrate that the intrinsic HER activity of Nidoped molybdenum oxides is triggered via a thermal treatment induced phase engineering strategy. The HER overpotential at 10 mA cm −2 decreases from 493 mV (1 M KOH) and 818 mV (seawater) over Ni-doped molybdenum trioxide (Ni-MoO 3 ) to only 234 and 412 mV over Ni-doped molybdenum dioxide (Ni-MoO 2 ), respectively. Moreover, the electrochemical surface areas (ECSAs)-normalized current density over Ni-MoO 2 , as compared to Ni-MoO 3 , is at least a 35-fold increase in alkaline (at −0.2 V vs reversible hydrogen electrode (RHE)) and a 59-fold increase in seawater (at −0.4 V vs RHE), confirming the significantly triggered intrinsic HER activity via engineering orthorhombic MoO 3 to monoclinic MoO 2 . Finally, an assembled Mg/seawater battery with the Ni-MoO 2 cathode reveals a peak power density of 6.54 mW cm −2 and a continuous stable discharge for over 24 h. This study offers a facile strategy for promoting the intrinsic HER activity of non-noble metal electrocatalysts.

show abstract

Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 96%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Triggering the Intrinsic Catalytic Activity of Ni-Doped Molybdenum Oxides via Phase Engineering for Hydrogen Evolution and Application in Mg/Seawater Batteries

Yang

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Recently, transition metal phosphides (TMPs), exhibiting the advantages of low-cost, excellent electrical conductivity, and high activity, have been explored for HER in neutral media as alternatives to noble metal-based electrocatalysts. [27][28][29][30][31][32][33][34][35][36][37][38] However, the TMPs catalysts usually show an inferior HER performance in neutral media than that in acid and alkaline media, of which the electronic structure can be further optimized by introducing anionic atoms. Meanwhile, the TMPs catalysts show inferior catalytic performance under large current densities compared with commercial Pt/C catalysts, which to date has hindered their potential industrial application.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Hydrogen Evolution Electrocatalytic Performance in Neutral Media via Nitrogen and Iron Phosphide Interactions

et al. 2021

View full text Add to dashboard Cite

It remains a challenge to develop efficient electrocatalysts in neutral media for hydrogen evolution reaction (HER) due to the sluggish kinetics and switch of the rate determining step. Although metal phosphides are widely used HER catalysts, their structural stability is an issue due to oxidization, and the HER performance in neutral media requires improvement. Herein, a new material, i.e., grapevine‐shaped N‐doped iron phosphide on carbon nanotubes, as an efficient HER catalyst in neutral media is developed. The optimized catalyst shows an overpotential of 256 mV at a large current density of 65 mA cm−2, which is even 10 mV lower than that of the commercial 20% Pt/C catalyst. The excellent performance of the catalyst is further studied by combined computational and experimental techniques, which proves that the interaction between nitrogen and iron phosphides can provide more efficient active structures and stabilize the metal phosphide electrocatalysts for HER.

show abstract

Surface Confinement of Atomically Thin Pt Nanoclusters on 2D δ‐Mon for Durable pH‐Universal Hydrogen Evolution

Do,

Li,

Prabhu

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

Engineering precious metals’ sub‐nanometer cluster on 2D earth‐abundant supports provides a promising approach for the development of high‐efficient electrocatalysts in pursuit of green hydrogen. Herein, a novel solid phase deposition approach is demonstrated for the homogenous confinement of atomically thin Pt nanoclusters on 2D delta‐MoN as a viable catalyst for pH‐universal hydrogen evolution reaction. Notably, the optimized material (MoN‐5% Pt) exhibits excellent catalytic performance as evidenced by low overpotentials required, excellent mass activity exceeding 20 A mgPt−1 at 100 mV overpotential, and outstanding stability with negligible activity degradation. The enhanced performance is attributed to (1) novel nanostructure, constituting atomically thin Pt nanoclusters confined on 2D δ‐MoN substrate, thus rendering high atomic utilization and seamless surface mass transfer, and (2) influence of strong metal‐support interaction that effectively limits structural deformation and performance degradation. Theoretical simulations reveal that the strong metal‐support interaction induces substantial charge redistribution across the heterointerface, initiating an energy‐favorable multi‐active site microkinetics in which Pt atoms with an optimal hydrogen adsorption energy making way for enhanced H2 evolution, while Mo atoms situated at the heterointerface enhance water absorption/dissociation steps, enriching the catalytic surface with adsorbed hydrogen atoms.

show abstract

Accelerating hydrogen evolution at neutral pH by destabilization of water with a conducting oxophilic metal oxide

Abstract: Self-supporting Ni4Mo–V2O3 nanosheets, which combine oxophilic V2O3 as a water dissociation center with Ni4Mo as a proton recombination site, display an extremely low overpotential (39.3 mV at 10 mA cm−2) for hydrogen evolution at neutral pH.

Cited by 23 publications

References 71 publications

Triggering the Intrinsic Catalytic Activity of Ni-Doped Molybdenum Oxides via Phase Engineering for Hydrogen Evolution and Application in Mg/Seawater Batteries

Triggering the Intrinsic Catalytic Activity of Ni-Doped Molybdenum Oxides via Phase Engineering for Hydrogen Evolution and Application in Mg/Seawater Batteries

Enhancing Hydrogen Evolution Electrocatalytic Performance in Neutral Media via Nitrogen and Iron Phosphide Interactions

Surface Confinement of Atomically Thin Pt Nanoclusters on 2D δ‐Mon for Durable pH‐Universal Hydrogen Evolution

Contact Info

Product

Resources

About