Application of Carbon-Based Oxygen Evolution Reaction …
5
Consider its superior OER performance in acid solution, we introduce the catalyst
to zinc electrowinning system. The Amino-HNC catalyst was prepared by a twostep method of electrodeposition and carbonization, use the catalyst as the anode
of the zinc electrowinning system directly. The voltage change of the Amino-HNC
anode during the zinc electrowinning process was measured, and compared with the
traditional industrial pure lead anode.
Experimental
Materials
Conductive carbon paper (Ningbo Weitai Energy Technology Co., LTD.), aniline
(AR, ≥99.5%, Shanghai Macklin Biochemical Technology Co., LTD.), concentrated
nitric acid (AR, Luoyang Haohua Chemical Reagent Co., LTD.), high purity lead
(99.999%), sulfuric acid (AR, Luoyang Haohua Chemical Reagent Co., LTD.), zinc
sulfate (AR, Tianjin Yongda Chemical Reagent Co., LTD.). High purity nitrogen
(99.999%). All reagents were used without further purification. Deionized water
was homemade and used for all steps.
Preparation of Amino-HNC
Referring to the method of Xu et al. [12], Amino-HNC was prepared directly on
conductive carbon paper through two steps of room temperature electrodeposition
and carbonization at high temperature. Firstly, carbon paper (CP) was treated at 500
°C under the air atmosphere about 2 h in a muffle furnace and washed with nitric
acid at room temperature with ultrasonic treatment for 30 min. After that, using
three-electrode system for polyaniline (PAni) electrodeposition on CP. The working,
counter, and reference electrodes were the acid-treated CP, carbon rod, and saturated
calomel electrode (SCE), respectively. The electrolyte mixture with 7 ml concentrated
HNO 3 , 5 ml aniline, and 88 ml deionized water was used for electrodeposition. The
electrodeposition of PAni on CP was under 0.7 V (vs. SCE) constant voltage for
600 s. Finally, the Amino-HNC catalyst was obtained by calcining 900 °C for 3 h in
the N 2 atmosphere at a heating rate of 3 K min
−1 .
The comparative sample was prepared through a one-step method. The carbon
paper was cut into 2 * 4 cm
2 , treated at 500 °C under air atmosphere about 2 h in
a muffle furnace and washed with nitric acid at room temperature with ultrasonic
treatment for 30 min. Next, calcining the acid-treated sample under 900 °C for 3 h
in the N 2 atmosphere at a heating rate of 3 K min
−1 , the obtained CP acted as the
comparative sample.
5
Consider its superior OER performance in acid solution, we introduce the catalyst
to zinc electrowinning system. The Amino-HNC catalyst was prepared by a twostep method of electrodeposition and carbonization, use the catalyst as the anode
of the zinc electrowinning system directly. The voltage change of the Amino-HNC
anode during the zinc electrowinning process was measured, and compared with the
traditional industrial pure lead anode.
Experimental
Materials
Conductive carbon paper (Ningbo Weitai Energy Technology Co., LTD.), aniline
(AR, ≥99.5%, Shanghai Macklin Biochemical Technology Co., LTD.), concentrated
nitric acid (AR, Luoyang Haohua Chemical Reagent Co., LTD.), high purity lead
(99.999%), sulfuric acid (AR, Luoyang Haohua Chemical Reagent Co., LTD.), zinc
sulfate (AR, Tianjin Yongda Chemical Reagent Co., LTD.). High purity nitrogen
(99.999%). All reagents were used without further purification. Deionized water
was homemade and used for all steps.
Preparation of Amino-HNC
Referring to the method of Xu et al. [12], Amino-HNC was prepared directly on
conductive carbon paper through two steps of room temperature electrodeposition
and carbonization at high temperature. Firstly, carbon paper (CP) was treated at 500
°C under the air atmosphere about 2 h in a muffle furnace and washed with nitric
acid at room temperature with ultrasonic treatment for 30 min. After that, using
three-electrode system for polyaniline (PAni) electrodeposition on CP. The working,
counter, and reference electrodes were the acid-treated CP, carbon rod, and saturated
calomel electrode (SCE), respectively. The electrolyte mixture with 7 ml concentrated
HNO 3 , 5 ml aniline, and 88 ml deionized water was used for electrodeposition. The
electrodeposition of PAni on CP was under 0.7 V (vs. SCE) constant voltage for
600 s. Finally, the Amino-HNC catalyst was obtained by calcining 900 °C for 3 h in
the N 2 atmosphere at a heating rate of 3 K min
−1 .
The comparative sample was prepared through a one-step method. The carbon
paper was cut into 2 * 4 cm
2 , treated at 500 °C under air atmosphere about 2 h in
a muffle furnace and washed with nitric acid at room temperature with ultrasonic
treatment for 30 min. Next, calcining the acid-treated sample under 900 °C for 3 h
in the N 2 atmosphere at a heating rate of 3 K min
−1 , the obtained CP acted as the
comparative sample.