Figure 3.

A) Schematic of the Ni-NSA catalytic hydrazine oxidation. B) HzOR performance of Ni-NSA, 3D porous Ni nanoparticle assembly (Ni-NPA), Cu nanosheet array, and commercial Pt/C (loaded on a Ni foam). C) Comparison of the specific activity and mass activity of Ni-NSA, Ni-NPAs, and 20 wt % Pt/C. An 81 % enhancement was observed for Ni-NSA. The specific activity and mass activity were currents normalized to geometric areas of the nickel foam substrates and the mass loading of the samples, respectively. D) Nyquist plots of the four electrodes, indicating that Ni-NSA possessed a much smaller charge-transfer resistance. Note: the loading amount of Pt/C was twice that of Ni-NSA because of the poor adhesion to the substrate. The mass loadings of Ni-NSA and Ni-NPA were 0.59 mg cm⁻² and 0.81 mg cm⁻², respectively.