Polyoxometalate‐Derived Ultrasmall Pt₂W/WO₃ Heterostructure Outperforms Platinum for Large‐Current‐Density H₂ Evolution

Abstract

Platinum (Pt)‐based catalysts with high Pt utilization efficiency for efficient H2 evolution are attracting extensive attention to meet the issues of energy exhaustion and environmental pollution. Herein, a one‐step electrochemical method is demonstrated to construct ultrafine heterostructure Pt2W/WO3 on reduced graphene oxide (RGO) by injecting multielectrons into the Preyssler anion [NaP5W30O110]14− to codeposit with anodic deliquescent Pt cations. The resulting Pt2W/WO3/RGO shows much higher performance than that of commercial Pt catalysts for large‐current‐density H2 evolution, which can deliver a large current density of 500 mA cm−2 with an overpotential of only 394 mV, much lower than that of 20% Pt/C (578 mV). Comparisons with control experiments and density functional theory (DFT) calculations both suggest that the much enhanced activity can be mainly attributed to the synergistic cooperation of different components to drive fast and continuous hydrogen desorption on Pt2W/WO3/RGO, while it could not run normally for 20% Pt/C under similar conditions due to the formation of huge bubbles on the electrode surface. The effective integration of high catalytic activity and hydrogen desorption ability into a single material can yield advanced materials for large‐current‐density H2 evolution with remarkable stability.

Versatile Synthesis of Pd−M (M=Cr, Mo, W) Alloy Nanosheets Flower‐like Superstructures for Efficient Oxygen Reduction Electrocatalysis

“…The related W 4 f fine XPS spectrum is highly asymmetric and can be deconvoluted into three sets of spin‐orbital doublets. As shown in Figure C, the two small peaks at the binding energies (BEs) of 31.3 and 32.9 eV are the characteristic 4f 7/2 and 4f 5/2 peaks for metal W (0) . Another two peaks at the BEs of 35.2 and 37.6 eV are the featured 4f 7/2 and 4f 5/2 peaks for W(IV) ions .…”

Engineering active sites on hierarchical transition bimetal oxides/sulfides heterostructure array enabling robust overall water splitting

“…Apart from morphology engineering, the hybrids can be extensively constructed by use of different transition-metal electrocatalysts through heterostructure engineering, regulating electron transfer and active site as well as the activity owe to the construction of coupling interfaces and the synergistic effect of the heterostructures. For instance, a large number of the heterostructures, such as NiMo/NiMoO x 8 , Co 3 O 4 /Fe 0.33 Co 0.66 P 16 , Ni 2 P/NiP 2 17 , NiFe(OH) x /FeS 18 , Pt 2 W/WO 3 19 , CuCo/CuCoO x 20 , Co(OH) 2 /PANI 21 , FeOOH/Co/FeOOH 22 , Co 0.85 Se/NiFe/graphene 23 , Ni 3 N/VN 24 , NiCu–NiCuN 25 , have been extensively synthesized for the enhanced electrochemical activities. Typically, sulfides-based heterostructures, such as CoS-doped β-Co(OH) 2 /MoS 2+ x 26 , MoS 2 /Fe 5 Ni 4 S 8 27 , MoS 2 /Ni 3 S 2 28 , NiS 2 /MoS 2 29 , MoS 2 /Co 9 S 8 /Ni 3 S 2 /Ni 30 , and MoS 2 /(Co,Fe,Ni) 9 S 8 coupled FeCoNi-based arrays 31 , have been systematically explored for the improved activities of electrochemical water splitting.…”

Boosting Alkaline Hydrogen Evolution Electrocatalysis over Metallic Nickel Sites through Synergistic Coupling with Vanadium Sesquioxide

“…The noble metal platinum is recognized as one of the most effective catalysts for the HER. Simultaneously having a low energy barrier in the Volmer step and a rapid Tafel step, Pt‐based catalysts exhibit excellent HER performance in acidic media . However, in alkaline solutions, the sluggish kinetics of the water dissociation step still cripple HER performance, even for Pt‐based electrocatalysts, and hence it remains a big challenge to develop catalytic materials with significantly accelerated kinetics for water dissociation …”