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Highly efficient H2 production over NiCo2O4 decorated g-C3N4 by photocatalytic water reduction
摘要： Herein, ternary nickel cobalt oxide (NiCo2O4) was firstly employed to increase the photocatalytic water reduction ability of g-C3N4. 17.5wt%-NiCo2O4/g-C3N4 shows excellent water splitting performance with a H2 production rate of 5480 μmol·h-1·g-1, which is extremely better than that of Co3O4, NiO, Pt modified g-C3N4. The quantum efficiency of 17.5wt%-NiCo2O4/g-C3N4 can reach 4.5% under 400 (±7.5) nm light irradiation. The greatly increased activity of 17.5wt%-NiCo2O4/g-C3N4 can be attributed to the richer active sites and the superior electrical performance provided by co-existing nickel and cobalt ions with multivalent state. Moreover, the activity of composite almost shows no significant weaken even after 20 h irradiation. A Z-scheme route was put forwarded for H2 production over NiCo2O4/g-C3N4 instead of the traditional p-n junction based on our study.
关键词： NiCo2O4,bimetallic complex,photocatalysis,hydrogen evolution
更新于2025-09-23 15:23:52
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Controllable design of double metal oxide (NiCo2O4) modified CdS for efficient photocatalytic hydrogen production
摘要： In the present work, we have successfully synthesized a kind of high efficiency NiCo2O4/CdS composite photocatalyst by using hydrothermal method and high temperature calcination. With the addition of NiCo2O4, hydrogen evolution has been greatly improved by successfully adjusting electron transport routes. For the composite catalyst, the maximum number of hydrogen evolution under visible light irradiation for 5 hours reached 549 μmol. Under this phenomenon, the hydrogen production rate of the corresponding composite catalysts reached 10980 μmol.g-1.h-1. The hydrogen production rate of composite catalysts is 5.1 times that of pure CdS under the same conditions. In addition, there is no significant decrease in the photocatalytic activity of the composite catalyst even after 5 cycles of photocatalytic hydrogen production. These phenomena indicate that the introduction of NiCo2O4 inhibits the photo-corrosion of CdS itself and enhances the hydrogen production activity while ensuring the stability of the catalyst. Regarding the physical properties of the NiCo2O4/CdS composite catalyst, we use XRD, SEM, TEM, XPS, BET and UV-vis to study the related of characterization. In photoelectron and hole transport mechanisms, we have studied the catalysts by photoluminescence spectroscopy, transient photocurrent and photoelectrochemical experiments. The introduction of NiCo2O4 increases the active site of the composite catalyst, which facilitates the separation of photogenerated electrons and holes, and accelerates the transfer of electrons.
关键词： Controllable design,CdS,NiCo2O4,Hydrogen production.
更新于2025-09-19 17:15:36
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Mesoporous NiCo2O4 network constructed from ultrathin-mesoporous nanosheets as high performance electrocatalyst in dye sensitized solar cell
摘要： Three-dimensional (3D) mesoporous network provides favorable structural features for ion diffusion, electroactive sites and contact with electrolyte, but fabricating the 3D networks of transition metal oxides is still challenging. Based upon template-free method, NiCo2O4 network constructed from ultrathin mesoporous nanosheets (NiCo2O4 MNN) was designed and synthesized. NiCo2O4 nanosheets (~5 nm of thickness, 2~5 nm of pore diameters) are highly interlaced with each other to form a 3D network and create porous nanostructure. Benefiting from the specific structural advantages, NiCo2O4 MNN delivers superior electrocatalytic performance as counter electrode (CE) in dye sensitized solar cell (DSSC), with a higher power conversion efficiency (PCE) of 8.05 % than Pt electrode (7.32 %). We believe that this research will open a new avenue for the design and development of efficient and cost-effective metal oxides electrocatalysts in DSSC.
关键词： electrocatalytic performance,mesoporous network,ultrathin-mesoporous nanosheets,NiCo2O4,template-free synthesis
更新于2025-09-19 17:13:59