Abstract
The direct hydrazine fuel cell is an attractive power generation technology for automotive applications. However, existing anode electrocatalysts generally suffer from low stability and problematic selectivity towards the non-Faradaic hydrazine (N2H4) decomposition. Herein, we report the fabrication of reduced graphene oxide (rGO)-supported nickel boride (Ni2B) nanocatalyst with a narrow size distribution around 1.5 nm by an ice-melting controlled NaBH4 reduction of Ni salt and graphene oxide. The chemical combination of Ni with B improves the intrinsic activity for N2H4 electrooxidation while suppressing the non-Faradaic N2H4 decomposition concurrently. Furthermore, Ni2B/rGO exhibits excellent stability with 91.4 % activity retention after 3000 cycles and a potential increment of only 13 mV after 50 h of constant-current measurement at 100 mA cm–2. Such stable performance is unprecedented for HzOR electrocatalysts. Our study presents the prospect of transition metal borides as high-performance HzOR electrocatalysts and may encourage further studies to explore their electrocatalytic applications.
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