Czasopismo | RUDY I METALE NIEŻELAZNE | Rocznik 2017 - zeszyt 8

Possibility of using NiCo2O4 alloy as catalyst for fuel electrode of hydrazine fuel cell

Możliwości zastosowania stopu NiCo2O4 jako katalizatora anody w hydrazynowym ogniwie paliwowym

10.15199/67.2017.8.2

nr katalogowy: 108938
10.15199/67.2017.8.2

Streszczenie

The use of fuel cells on a large scale is mainly limited by the high cost of catalysts. Elimination of platinum as catalyst would allow for wider commercial application of fuel cells. The paper presents a study of hydrazine electrooxidation on NiCo2O4. So, the work shows a possibility of use of NiCo2O4 alloys as catalysts for anode of hydrazine fuel cells. Researches were done in glass vessel on an electrode with NiCo2O4 alloy as a catalyst. An aqueous solution of KOH was used as the electrolyte. Measurements were done with the use of potentiostat. Conducted measurements show that there is a possibility of electrooxidation of hydrazine with NiCo2O4 catalyst. In any case, the process of electrooxidation of hydrazine occurs. A current density of about 15–35 mA/cm2 has been obtained for all concentrations of hydrazine and electrolyte. The current density is low, but the price of this catalyst is much lower than platinum. The using catalyst with 15 and 25% of Co provides obtained higher current density than using catalyst with 50 and 75% of Co. So, the work shows possibility to use NiCo2O4 alloy as catalysts for fuel electrode of hydrazine fuel cells.

Abstract

Szerokie stosowanie ogniw paliwowych ograniczone jest głównie wykorzystywaniem drogich katalizatorów. Wyeliminowanie platyny umożliwiłoby szeroką komercjalizację tych ogniw. Artykuł przedstawia analizę elektroutleniania hydrazyny na katalizatorze NiCo2O4. Jako elektrolit wykorzystano wodny roztwór KOH. Pomiarów dokonano potencjostatem. Wykazano możliwość elektroutleniania hydrazyny na katalizatorze NiCo2O4. W każdym przypadku (dla wszystkich stężeń hydrazyny i udziałów Co) proces elektroutleniania zachodził. Gęstość prądu wynosiła 15–35 mA/cm2 dla wszystkich koncentracji hydrazyny i elektrolitu. Gęstość prądu jest niewielka, jednak koszt uzyskania katalizatora jest znacznie niższy od kosztów platyny. Gęstość prądu jest wyższa dla stopów o 15 i 25% udziale Co, niż stopów o 50 i 75% udziale Co. Wykazano więc możliwość wykorzystania stopu NiCo2O4 jako katalizatora anody w hydrazynowym ogniwie paliwowym.

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Keywords

Bibliografia

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