Page 58 - EER-2-3

Explora: Environment
and Resource Electrocatalyst for ammonia oxidation reaction

concentration of 450 μL of H PtCl ·6H O (0.1 moL/L) and 3. Results and discussion
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1,050 μL of deionized water, the temperature of the water
bath was controlled at 30°C, 40°C, and 50°C, with heating In this work, ammonium chloride (NH Cl) was used as the
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maintained for 8 h. The obtained samples were named as ammonia source. The cyclic voltammetry (CV) technique
Pt-(NiCo-LDH)-X (X = 5, 6, 7). In addition, the sample was employed to analyze the electrochemical reactions
prepared without H PtCl ·6H O (0.1 moL/L) was named based on the peak current, peak potential, and related
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NiCo-LDH-8, the sample prepared without NiCo-LDH parameters. The oxidation peak current is one of the
was named Pt-NF-9, and the NF was designated NF-10. important parameters to evaluate the activity of catalysts.
Figure 1 shows the synthesis process of NiCo-LDH and Higher peak currents indicate better catalytic activity,
Pt-(NiCo-LDH)-X. characterized by faster electron transfer, accelerated
electrode reaction rates, and lower reaction resistance.
To select the best synthesis condition of the catalyst, the
CV technique was conducted on all catalysts for the AOR.
The oxidation reaction peak currents were collected and
used as a key parameter to evaluate the catalyst activity.
In addition, to obtain an electrocatalyst with excellent
catalytic performance, the volume of H PtCl 6H O and
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the reaction temperatures of H PtCl 6H O and NiCo-
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LDH were regulated.
First, the concentrations of H PtCl 6H O were studied.
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Figure 2A-D shows the CV curves of the Pt-(NiCo-
LDH)-X (X = 1, 2, 3, 4) catalysts synthesized with H PtCl
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6H O volumes ranging from 0.15 mL to 0.60 mL. In the
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Figure 1. The synthesis process of nickel (Ni)–cobalt layered double 1 M potassium hydroxide (KOH) and 1 M KOH + 0.1 M
hydroxide and platinum–(Ni–cobalt layered double hydroxide)-X NH Cl solutions, a distinct oxidation peak emerged at
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A B

C D

Figure 2. The cyclic voltammetry curves of platinum–(nickel–cobalt layered double hydroxide)-X (Pt-[NiCo-LDH]-X). (A) Pt-(NiCo-LDH)-1,
(B) Pt-(NiCo-LDH)-2, (C) Pt-(NiCo-LDH)-3, and (D) Pt-(NiCo-LDH)-4 catalysts in 1 M potassium hydroxide (KOH) and 1 M KOH + 0.1 M ammonium
chloride (NH4Cl) solutions. Hg/HgO refers to mercury/mercury oxide used as the reference.

Volume 2 Issue 3 (2025) 3 doi: 10.36922/EER025170033