The Study Of Transition Metal Phosphide And Their Electrochemical Performance

Environment and energy solutions are regarded as the most challenged two problems of 21 st century,which are also the most urgent issues to be solved.New energy resources are one of best solution for above-mentioned problems,especially for applied hydrogen as energy supply.As the regards of application of hydrogen,it still exist two challenges.One is that as a promising future energy,hydrogen bears a relative high electrolysis overpotential,which may leads to high cost for produce,though it has many incomparable advantages,such as high heating value,non-pollution and so on.Another problem should be the energy-storage system to store and transfer hydrogen energy.Accordingly,to help solve the above-mentioned two challenges,we designed and prepared materials for high-performance supercapacitor electrode and water splitting catalysts.Firstly,we synthesis Co₃O₄ via hydrothermal,and further obtained CoP nanowire.We applied as-prepared Co P nanowire to supercapacitor electrode material,which shows excellent electrochemical performance.At a scan rate of 2 mV s-1,the specific capacity could reach 1500 F g-1.Compared with previous-reported electrode materials,the as-obtained CoP nanowire shows outstanding stability performance,which could retained 99.2% of its' initial specific capacity after 5000 cycles.We assembled supercapacitor device by applying CoP as anode and reduced graphene oxide as cathode.The as-obtained device shows a voltage window of 1.6V,a specific capacity of 215.3 F g-1 and a high energy density of 76.55 Whkg-1.Secondly,we developed a kind of in-situ MoO₂ coupled CoP hybrid nanosheets.We applied carbon cloth as substrate in this work.The as-prepared material shows great advantages in following aspects: 1)the active material was directly growth on the carbon cloth substrate,which enables outstanding mechanical property and electrical conductivity;2)we applied carbon cloth as the flexible substrate,which is benefit to enhance the stability of the catalysts;3)the as-prepared catalysts keeps a kind of effective porous structure,which not only improve the utilization of active site but also enhance the generation and transmission of the gas in the inner space of the material;4)the introduce of the high efficiency co-catalyst shows a great enhancement of the catalytic performance.When applied as catalytic electrodes,the as-prepared porous hybrid exhibits remarkable catalytic performance for both HER,OER and overall water splitting in alkaline media.A current density of 10 mA cm-2 were obtained at overpotential of ²9 mV for HER and ³40 mV for OER.Remarkably,the as-obtained material shows an ultra-high HER catalytic performance which is comparable with 20% commercial Pt/C.When applied in overall water splitting,a voltage of 1.60 V and 1.64 V is needed to reach a current density of 10 mA/cm2 and 20 mA/cm2.In the meanwhile,a considerable electrolytic efficiency and gas generating rate was obtained.