Synthesis,Characterization And Application Of Supported Nickel-Based Nanocomposite Electrodes

Nanomaterials show unique physical and chemical properties due to their special structures,which can be used as electrode materials and have a great potential application in the field of electrochemistry,such as sensors,photoelectrocatalysis.But now,electrode materials based noble metal electrocatalysts due to the high cost limit their wide-ranging applications.The nickel-based nanomaterials can be used as the ideal alternative materials because of the low cost,bundant reserves and excellent catalytic performance.But there are still great challenges about how to achieve facile preparation of supported Ni-based nanostructure catalysts and how to construct the photoelectrocatalytic system of catalyst-semiconductor.Therefore,aiming at the exsiting problems of complicated preparation process,uncontrollability of morphology and poor interfacial compatibility towards supported Ni-based nanostructure catalysts,we revolve around the one-step preparation methods of supported Ni-based nanosheet composite electrodes and focuse our research on the relationship between structure and electrocatalytic/photoelectrocatalytic performance.This paper provides important ideas and references for achieving the rational design and synthesis of other analogous supported nanostructure composite electrodes.The detailed content includes the following three aspects:1.NiO nanosheets(s-NiO)vertically grown on graphite disks(GD)have been successfully fabricated for an electrochemical glucose sensor by a simple surfactant-templated method.The as-grown s-NiO are featured with a 3D porous structure and avertically aligned morphology on GD,showing more catalytic active sites and providing a large interfacial contact area.The s-NiO/GD composite electrode manifests excellent electrocatalytic performance towards the oxidation of glucose,including a wide linear range,high sensitivity,good selectivity and stability.Significantly,the s-NiO/GD electrode shows good stability,which may be attributed to its unique 3D porous structure,providing ample space and thus ensuring the release of oxygen bubbles more smoothly.2.The NiO/TiO2 nanorod array composite photoanode has been constructed for a photoelectrochemical glucose sensor by a facile chemical bath deposition method.The results show that NiO nanosheets not only could promote the rapid transfer of photogenerated carriers of TiO2 photoanode,but also could achieve fast,efficient electro-oxidation process towards glucose.Therefore,as prepared NiO/TiO2 nanorod array composite photoanode exhibits good photoelectrocatalytic performance towards the oxidation of glucose,achieving the quantitative detection of glucose at low bias potential and showing excellent selectivity,good stability.3.NiFe(OH)x/BiVO4 core-shell nanostructure composite photoanode has been synthesized for photoelectrochemical water splitting via a mild electrochemical deposition method.The results reveal that two dimensional NiFe(OH)x nanosheets show excellent catalytic activility,which could effectively increase the kinetics of water oxidation reaction and promote utilization of surface holes of BiVO4 substrate electrode,enhancing performance in photoelectrochemical water splitting obviously.