Nanoporous Ni <sub>0.85</sub> Se Electrocatalyst Anchored on rGO for Hydrazine Oxidation
Zhongbao Feng, Wanting Zhang, Wentao Liu, Han Zhang, Enping Wang
Abstract
Developing high-performance hydrazine oxidation (HzOR) electrocatalysts is critical for the development of direct hydrazine fuel cells (DHFCs). In this work, we report a nanoporous structured Ni 0.85 Se/rGO HzOR catalyst fabricated by two-step electrodeposition. Compared to Ni 0.85 Se and NF, Ni 0.85 Se/rGO shows outstanding electrocatalytic activity and durability toward HzOR. A high current density of 408 mA cm −2 , a small Tafel slope of 58.8 mV dec −1 , almost 100% selectivity toward the complete hydrazine oxidation, and a high retention rate of 91.4% at 50 mA cm −2 after 24 h test can be observed for HzOR, which is at top level among recently reported catalysts. The mechanism for the impressively high durability of Ni 0.85 Se/rGO was revealed, which is associated with its larger ECSA, high electrical conductivity, well-maintained nanoporous structure, and the superaerophobic surface caused by nanoporous structure.