Spiky Nickel Electrodes for Electrochemical Oxygen Evolution Catalysis by Femtosecond Laser Structuring

Figure 5

Contact angle measurements of the tempered Ni plate as prepared (a) and activated (b), Ni CLPs 0° as prepared (c) and activated (d), and Ni CLPs 45° as prepared (e) and activated (f). The measurements were carried out with a deionized water droplet (V = 1 μL). The activated electrodes show superhydrophilic behavior; therefore determination of the contact angle was not possible.

(a)

(b)

(c)

(d)

(e)

(f)