Preparation And Evaluation Of Electrical Conductivity Of Cu-loaded Bacterial Cellulose Composites

With the progress of social civilization,the human world’s demand for energy is increasingly high,but with the consumption of fossil energy has brought big problems of environmental pollution,so the development of new energy is the social trend after the second industrial revolution.Electrochemical technology plays an important role in the development of new energy.As a catalytic electrode,it requires high catalytic efficiency and good conductivity.But the existing problem is that the catalytic efficiency and catalytic activity of the catalytic electrode need to be improved.There are carrier selection and catalyst selection for the study of catalytic electrode.All scientific researchers have studied carbon family nanomaterials,such as carbon nanotubes,hollow porous carbon and graphene oxide as carriers of conductance materials.However,they have a high cost,are synthesized through chemical processes,and the process is complex and harmful to the environment.Bacterial nano-cellulose（BNC）,derived from Bacterial metabolism,is a natural high polymer with high purity,good biodegradability and excellent mechanical tensile properties,and most importantly,it has three-dimensional mesh porous Nano structure,so it can be used as an ideal environment-friendly carrier material.BNC materials are simple and easy to obtain.The raw materials for BNC cultivation are mainly composed of carbon source and nitrogen source.The efficient production of BNC is related to the culture mode（oscillation culture and static culture）,and it is most important to find a suitable culture method.Were studied at different concentrations of glucose as carbon source under three different harvesting mode（intermittent harvest membrane,intermittent oscillation,static culture）cultured from bacterial cellulose and compare its production and BNC membrane performance,it is concluded that the 50g/L glucose as carbon source,through regular rest cultured from BNC membrane on the performance compared with other glucose concentration and the other way is better,after purification,used as carrier material by changing different reaction conditions to compare the electrochemical performance of composite membrane materials.The experimental results are as following:（1）from the macroscopic morphology,the concentration of glucose will affect the morphology of BNC film.When the glucose concentration reaches 100g/L,the BNC film surface will form.The morphology of partial fracture and the homogeneity of membrane were poor.（2）in terms of yield,the yield of BNC film decreased with the increase of the number of harvesting film in the intermittent harvest film;Compared with the three different harvesting mode,in the intermittent harvest membrane and intermittent oscillation experiments,the yield reached the maximum when the glucose concentration was 50g/L,reaching4.87g/L and 5.14g/L,respectively.In static culture experiment,the yield was slightly higher when the glucose concentration was 100g/L,reaching 5.31g/L.Considering the problem of efficient production,the glucose concentration of 50g/L was the best culture concentration under the three harvesting mode.（3）on the preparation of composite membrane material,through the comparison of various factors,the results obtained when the ratio of the amount of substance of CuSO₄ with NaBH₄ is 4:3,70%ethanol as a stabilizer,BNC film immerse in CuSO₄ solution for 24 h,NaBH₄dropping speed of 4 ml/min when the conductance of the best performance,current density and electrical conductivity are maximum reached 37.5 mA/cm²,respectively 0.07 S/cm.In addition,the average diameter of copper nanoparticles on BNC composite films obtained from this condition was58.83nm.Therefore,BNC composite membrane materials synthesized under the optimal conditions can be used as catalytic electrode materials.BNC material is green,pollution-free,low cost and can be used in large quantities to prepare catalytic electrodes.