Implementation of non-precious electrocatalysts is key-enabling for water electrolysis to relieve challenges in energy and environmental sustainability. Self-supporting Ni-V2O3 electrodes consisting of nanostrip-like ...Implementation of non-precious electrocatalysts is key-enabling for water electrolysis to relieve challenges in energy and environmental sustainability. Self-supporting Ni-V2O3 electrodes consisting of nanostrip-like V2O3 perpendicularly anchored on Ni meshes are herein constructed via the electrochemical reduction of soluble NaVO3 in molten salts for enhanced electrocatalytic hydrogen evolution. Such a special configuration in morphology and composition creates a well confined interface between Ni and V2O3. Experimental and Density-Functional-Theory results confirm that the synergy between Ni and V2O3 accelerates the dissociation of H2O for forming hydrogen intermediates and enhances the combination of H*for generating H2.展开更多
Vanadium trioxide（V2O3） was directly prepared by NaVO3 electrolysis in Na Cl molten salts. Electrolysis products were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and energy dispers...Vanadium trioxide（V2O3） was directly prepared by NaVO3 electrolysis in Na Cl molten salts. Electrolysis products were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and energy dispersive spectroscopy（EDS）. The existing state and electrochemical behavior of NaVO3 were also studied. The results indicated that V2O3 can be obtained from NaVO3. VC and C were also formed at high cell voltage, high temperature, and long electrolysis time. During electrolysis, NaVO3 was dissociated to Na＋ and VO3-in Na Cl molten salt. NaVO3 was initially electro-reduced to V2O3 on cathode and Na2O was released simultaneously. Na2CO3 was formed due to the reaction between Na2O and CO2. The production of C was ascribed to the electro-reduction of CO3（2-）. VC was produced due to the reaction between C and V2O3.展开更多
Vanadium sesquioxide (V2O3) nanopowder was successfully prepared by the solid phase reaction of themixture of vanadyl hydroxide (VO(OH)2) and ammonium chloride (NH4Cl) at 500 ℃. The as-obtained samples were character...Vanadium sesquioxide (V2O3) nanopowder was successfully prepared by the solid phase reaction of themixture of vanadyl hydroxide (VO(OH)2) and ammonium chloride (NH4Cl) at 500 ℃. The as-obtained samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). V2O3 nanoparticles were well dispersed and displayed sphere-like particles with diameters in the range of 30～50 nm.展开更多
基金the funding support from the National Natural Science Foundation of China(51722404,51674177,51804221 and 91845113)the National Key R&D Program of China(2018YFE0201703)+2 种基金the China Postdoctoral Science Foundation(2018M642906 and 2019T120684)the Fundamental Research Funds for the Central Universities(2042017kf0200)the Hubei Provincial Natural Science Foundation of China(2019CFA065)。
文摘Implementation of non-precious electrocatalysts is key-enabling for water electrolysis to relieve challenges in energy and environmental sustainability. Self-supporting Ni-V2O3 electrodes consisting of nanostrip-like V2O3 perpendicularly anchored on Ni meshes are herein constructed via the electrochemical reduction of soluble NaVO3 in molten salts for enhanced electrocatalytic hydrogen evolution. Such a special configuration in morphology and composition creates a well confined interface between Ni and V2O3. Experimental and Density-Functional-Theory results confirm that the synergy between Ni and V2O3 accelerates the dissociation of H2O for forming hydrogen intermediates and enhances the combination of H*for generating H2.
基金supported by the National Basic Research Program of China(973 Program)(No.2013CB632606)National Natural Science Foundation of China(Nos.51474200,51422405)Youth Innovation Promotion Association,CAS(No.2015036)
文摘Vanadium trioxide（V2O3） was directly prepared by NaVO3 electrolysis in Na Cl molten salts. Electrolysis products were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and energy dispersive spectroscopy（EDS）. The existing state and electrochemical behavior of NaVO3 were also studied. The results indicated that V2O3 can be obtained from NaVO3. VC and C were also formed at high cell voltage, high temperature, and long electrolysis time. During electrolysis, NaVO3 was dissociated to Na＋ and VO3-in Na Cl molten salt. NaVO3 was initially electro-reduced to V2O3 on cathode and Na2O was released simultaneously. Na2CO3 was formed due to the reaction between Na2O and CO2. The production of C was ascribed to the electro-reduction of CO3（2-）. VC was produced due to the reaction between C and V2O3.
文摘Vanadium sesquioxide (V2O3) nanopowder was successfully prepared by the solid phase reaction of themixture of vanadyl hydroxide (VO(OH)2) and ammonium chloride (NH4Cl) at 500 ℃. The as-obtained samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). V2O3 nanoparticles were well dispersed and displayed sphere-like particles with diameters in the range of 30～50 nm.
