Fabrication of Co(PO3)2@NPC/MoS2 heterostructures for enhanced electrocatalytic hydrogen evolution

Enhanced Alkaline Oxygen Evolution Using Spin Polarization and Magnetic Heating Effects under an AC Magnetic Field

“…ZIF-67 particles were prepared via our previous reported method . First, 1.9700 g of 2-MIM (24 mmol) and 0.5821 g of Co­(NO 3 ) 2 ·6H 2 O (2 mmol) were dissolved in 50 mL of MeOH.…”

Regulating the Metal Concentration for Selective Tuning of VS2/MoS2 Heterostructures toward Hydrogen Evolution Reaction in Acidic and Alkaline Media

“…The percentage area of the V 3+ state was higher in VMS1 than in VMS2, indicating the formation of dangling sulfur atoms, which can act as active sites for hydrogen absorption and desorption as confirmed from Figure S1d. , Interestingly, the Mo 3d peaks for all the VS 2 /MoS 2 heterostructures depicted a shift toward a lower binding energy compared with pure MoS 2 . The observed peak shifts demonstrated that the electrons may transfer from VS 2 nanosheets to MoS 2 nanopetals as the former has a smaller work function and thereby a strong coupling effect between VS 2 and MoS 2 was formed at the heterostructure interface. ,, Moreover, the strong electronic interaction between VS 2 and MoS 2 in the heterostructure provided a conducting architecture, and therefore, the electrochemical performance was improved. Figure a–c shows the two characteristic peaks of S 2– species, which correspond to the S 2p3/2 and S 2p1/2, with a spin-orbit splitting of 1.2 eV. − The XPS results were in good agreement with the successful formation of the heterostructure as reported in the literature. ,− Moreover, the obvious binding energy shifts for Mo 3d, V 2p, and S 2p XPS spectra suggested a strong electronic interaction between the MoS 2 and VS 2 within the different compositions of the heterostructures.…”

“…The observed peak shifts demonstrated that the electrons may transfer from VS 2 nanosheets to MoS 2 nanopetals as the former has a smaller work function and thereby a strong coupling effect between VS 2 and MoS 2 was formed at the heterostructure interface. ,, Moreover, the strong electronic interaction between VS 2 and MoS 2 in the heterostructure provided a conducting architecture, and therefore, the electrochemical performance was improved. Figure a–c shows the two characteristic peaks of S 2– species, which correspond to the S 2p3/2 and S 2p1/2, with a spin-orbit splitting of 1.2 eV. − The XPS results were in good agreement with the successful formation of the heterostructure as reported in the literature. ,− Moreover, the obvious binding energy shifts for Mo 3d, V 2p, and S 2p XPS spectra suggested a strong electronic interaction between the MoS 2 and VS 2 within the different compositions of the heterostructures. The enhanced electron transferability and the modified charge carrier density of the S-edge sites of the heterostructure accelerated the charge transfer kinetics during the electrochemical process, indicating an improved HER performance compared to the pristine TMDs (MoS 2 and VS 2 ). − The out-of-plane 3d and 4d orbit of V and Mo atoms interacted with the S 2p orbit of MoS 2 and VS 2 , resulting in the formation of heterostructure junctions, which improved the synergistic interaction between MoS 2 and VS 2 , and thereby, the electrochemical performance was improved. , …”

“…Figure a–c presents the deconvoluted XPS spectra of Mo 3d with two characteristic peaks at ∼229 for 3d5/2 and ∼233 eV for 3d3/2 with a spin-orbit splitting energy value of 3.2 eV. This is attributed to the Mo 4+ oxidation state in the heterostructure (Figure a–c). , The Mo/V ratio in the heterostructure hardly altered the average oxidation state of Mo. Therefore, MoS 2 barely monitored the electrochemical performance of the heterostructure by altering the structural and electronic properties.…”

High-performance self-supporting AgCoPO4/CFP for hydrogen evolution reaction under alkaline conditions

“…18 Xiao reported a novel heterostructures named Co(PO 3 ) 2 @NPC/MoS 2 , where NPC was N-doped porous carbon. 19 It clearly indicated that its electronic structure and HER performance was greatly ameliorated by interface of Co(PO 3 ) 2 @NPC/MoS 2 . In consequence, a lower overpotential of 119 mV was acquired in alkaline electrolyte at 10 mA cm À2 .…”