연료전지 무인기 탑재용 수소발생기의 성능평가

Abstract

Performance of a hydrogen generator for a fuel cell unmanned aircraft was evaluated as the change of temperature environment. Sodium borohydride (NaBH₄) was used as a hydrogen source due to its high hydrogen content and good storability. The hydrogen gas was generated by the hydrolysis reaction using a catalytic reactor. Reaction chambers were set up with the range of temperatures from -20 to 60 ℃. The hydrogen generation rate and temperatures changes of reactor and separator were measured at the NaBH₄ concentrations of 20 and 25wt. %. As a result, the hydrogen generation rate was decreased as the repeated reaction cycles. It showed that the hydrogen generation rate was stable at low temperature, while at high temperature the hydrogen generation rate was rapidly decreased. The performance degradation was mainly caused by the catalyst loss and NaBO₂ deposition on the catalyst surface.