Electrolyte Science Fair Projects

Electolyte Science Fair Projects Tips

When you are experimenting with biochemical properties it is important to fully understand all of the processes that are involved. In the case of electrolytes you will want to learn more about metabolism and biochemical reactions. Your science text book most likely will have a segment on biochemistry that you can read, or if this section is not included in your book you can read science journal articles on the topic.

Objectives/Goals

Hydrogen fuel cells are electrochemical energy conversion devices. This means that they convert chemical energy into electrical energy. This process is able to occur only when the two fuel sources, hydrogen and oxygen, are continuously supplied. One of the factors which determines the hydrogen and oxygen production includes the type of electrolyte used. The focus of this experiment is conceptually demonstrate the hydrogen fuel cell due to the fact that hydrogen is highly flammable and difficult to obtain.

Hypothesis: If you use an electrolyte with a low conductivity value, then the conversion efficiency (electrical power) of the fuel cell will decrease.

Solar House

Ages 12 thru High School

Methods/Materials

Electrodes-platinum coated nickel wires (30 cm),cup,digital multimeter,circuit board,toggle switch,4 electrolytes: tap water,coke,lemon juice,white vinegar,and a 9 Volt battery

In my experiment, I connected a circuit board and a single pole, double throw (SPDT) toggle switch. To this device, I also connected 2 insulated, copper wires and a 9 V battery. The cup is used to hold the various electrolytes and dipped in the electrolyte, are the electrodes which have been coiled and connected to the circuit board and multimeter. I used the process of electrolysis (passing an electric current through an electrolyte) to generate the fuel sources of hydrogen and oxygen. I then flipped the toggle switch to recombine these two fuel sources to produce electricity. I repeated this procedure for each electrolyte.

Results

Out of the 4 electrolytes, vinegar and lemon juice produced more fuel sources, therefore more electricity. The coke started out by producing a tremendous amount of hydrogen and oxygen although the decline was incredibly quick. This could have been because of the continuous ionization in the phosphoric acid. In the case of the tap water, the depletion of the hydrogen and oxygen were quite similar. This disproved my theory because I believed that the high citric acid content in the lemon juice would cause it to produce more of the fuel sources/electricity. Although, it is a possibility that a residue of tap water got mixed in with the lemon juice due to the fact I used the lemon juice corresponding to the tap water.

Conclusions/Discussion

The power generated by the fuel cell does not correlate to the conductivity of the electrolyte. This necessitates further experimentation and development to figure out the reasons behind this conclusion. 3rd party contributor