Application of Carbon-Based Oxygen Evolution Reaction …
9
(RHE) at different temperatures is E =
E SCE + 0.0591pH + E
θ
SCE
V. The overpotential (η) of OER is matched with this formula: η = (E RHE − 1.23) V, where 1.23 V
is the standard potential for oxygen evolution reaction.
Figure 4a and b show linear scanning polarization curves of Amino-HNC and
CP in 0.5 M H 2 SO 4 solution at different temperatures, respectively. As can be seen
in the figure, Amino-HNC shows a lower OER overpotential trend compared with
CP at different temperatures. In the range of 278–318 K, oxygen evolution reaction
starts around 1.50 V on the Amino-HNC anode, and occurs around 1.71 V on the CP
anode, indicated that Amino-HNC has a better OER catalytic performance compared
with CP. Further, consider the zinc electrowinning condition of 308 K, we focus on
the performance at that temperature of Amino-HNC. As shown in Fig. 3c, the OER
potential of Amino-HNC is 1.618 V on 308 K, which led to a low OER overpotential
of 389 mV (@ 10 mA cm
−2 ), and has a low Tafel slope for 38 mV dec
−1 (Fig. 3d).
Fig. 4 Linear scanning polarization curves of a Amino-HNC, b CP in 0.5 M H 2 SO 4 solution at
different temperature. Amino-HNC in 0.5 M H 2 SO 4 at 308 K c Linear scanning polarization curve.
d Tafel fitting curve. (Color figure online)
9
(RHE) at different temperatures is E =
E SCE + 0.0591pH + E
θ
SCE
V. The overpotential (η) of OER is matched with this formula: η = (E RHE − 1.23) V, where 1.23 V
is the standard potential for oxygen evolution reaction.
Figure 4a and b show linear scanning polarization curves of Amino-HNC and
CP in 0.5 M H 2 SO 4 solution at different temperatures, respectively. As can be seen
in the figure, Amino-HNC shows a lower OER overpotential trend compared with
CP at different temperatures. In the range of 278–318 K, oxygen evolution reaction
starts around 1.50 V on the Amino-HNC anode, and occurs around 1.71 V on the CP
anode, indicated that Amino-HNC has a better OER catalytic performance compared
with CP. Further, consider the zinc electrowinning condition of 308 K, we focus on
the performance at that temperature of Amino-HNC. As shown in Fig. 3c, the OER
potential of Amino-HNC is 1.618 V on 308 K, which led to a low OER overpotential
of 389 mV (@ 10 mA cm
−2 ), and has a low Tafel slope for 38 mV dec
−1 (Fig. 3d).
Fig. 4 Linear scanning polarization curves of a Amino-HNC, b CP in 0.5 M H 2 SO 4 solution at
different temperature. Amino-HNC in 0.5 M H 2 SO 4 at 308 K c Linear scanning polarization curve.
d Tafel fitting curve. (Color figure online)