[논문]NaBH4 화학적 처리를 통한 백금화 카본 전극의 촉매반응 향상

윤창석; 황성필

doi:10.14478/ace.2020.1075

Abstract ▼ AI-Helper

The effect of a chemical pretreatment on the surface carbon was investigated using a scanning electron microscope (SEM) and electrochemical methods. Primitive carbon has a reducing power likely due to incompletely oxidized functional groups on the surface. We aim to control this reducing power by ch...

The effect of a chemical pretreatment on the surface carbon was investigated using a scanning electron microscope (SEM) and electrochemical methods. Primitive carbon has a reducing power likely due to incompletely oxidized functional groups on the surface. We aim to control this reducing power by chemical treatment and apply for the spontaneous deposition of nanoparticles (NPs). Highly ordered pyrolytic graphite (HOPG) was initially treated with a reducing agent, NaBH4 or an oxidizing agent, KMnO4, for 5 min. Subsequently, the pretreated carbon was immersed in a platinum (Pt) precursor. Unexpectedly, SEM images showed that the reducing agent increased spontaneous PtNPs deposition while the oxidizing agent decreased Pt loading more as compared to that of using bare carbon. However, the amount of Pt on the carbon obviously decreased by NaBH4 treatment for 50 min. Secondly, spontaneous reduction on pretreated glassy carbon (GC) was investigated using the catalytic hydrogen evolution reaction (HER). GC electrode treated with NaBH4 for a short and long time showed small (onset potential: -640 mV vs. MSE) and large overpotential for the HER, respectively. Although the mechanism is unclear, the electrochemistry results correspond to the optical data. As a proof-of-concept, these results demonstrate that chemical treatments can be used to design the shapes and amounts of deposited catalytic metal on carbon by controlling the surface state.

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표/그림 (4)

그림 Scheme 1. Illustration of spontaneous Pt modification on the carbon electrodes with or without a chemical pretreatment.
그림 Figure 1. SEM images of the spontaneous Pt deposition on HOPG (A) without a chemical pretreatment, (B) with KMnO₄ for five minutes, and (C) and (D) with NaBH4 for five minutes. A scratch during the mounting process served as a marker in (C) and (D). (E) HOPG surface treated with NaBH₄ for 50 minutes.
4 treatment. The brown one was immersed in a Pt solution after a KMnO₄ treatment. Scan rate: 100 mV/s." alt="Figure 2. CVs of (A) a Pt disk electrode and (B) a Pt-modified glassy carbon electrode with different pretreatments in 0.5 M H₂SO₄ electrolyte. The "bare GC (black)" sample was not treated with a chemical agent and a Pt precursor. The "Not treated GC (Blue)" sample was immersed only in the Pt precursor for 10 min without a chemical treatment. Both the red and green ones were immersed in a Pt solution after a NaBH₄ treatment. The brown one was immersed in a Pt solution after a KMnO₄ treatment. Scan rate: 100 mV/s." onerror="this.src='/images/noimg.png'" class="objectfit" /> 그림 Figure 2. CVs of (A) a Pt disk electrode and (B) a Pt-modified glassy carbon electrode with different pretreatments in 0.5 M H₂SO₄ electrolyte. The "bare GC (black)" sample was not treated with a chemical agent and a Pt precursor. The "Not treated GC (Blue)" sample was immersed only in the Pt precursor for 10 min without a chemical treatment. Both the red and green ones were immersed in a Pt solution after a NaBH₄ treatment. The brown one was immersed in a Pt solution after a KMnO₄ treatment. Scan rate: 100 mV/s.
그림 Scheme 2. Illustration of the effect of chemical pretreatment on the spontaneous Pt modification on the carbon electrodes and electrocatalytic activity for HER.

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제안 방법

Third, a 10 mM K₂PtCl₆ aqueous solution was dropped on the pre-treated HOPG and maintained for 10 min. After washing with water, surface structure was studied by the SEM.

대상 데이터

The 98% sodium borohydride (452882, NaBH₄), 99.99% potassium hexachloroplatinate(IV) (379589, K₂PtCl₆), 99.999% sulfuric acid (339741, H₂SO₄) were purchased from Sigma Aldrich. The 99.
999% sulfuric acid (339741, H₂SO₄) were purchased from Sigma Aldrich. The 99.99% potassium permanganate (P1066, KMnO₄) was purchased from Samchun.
The glassy carbon electrode (GC, 3 mm diameter, BASi), a Pt wire, and a mercury-mercurous sulfate electrode (MSE, sat’d K2SO4) were used as a working electrode, a counter electrode, and a reference electrode, respectively.

참고문헌 (15)

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NaBH4 화학적 처리를 통한 백금화 카본 전극의 촉매반응 향상
Enhanced Electrocatalytic Activity of Platinized Carbon Electrode via NaBH4 Treatment 원문보기

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NaBH4 화학적 처리를 통한 백금화 카본 전극의 촉매반응 향상 Enhanced Electrocatalytic Activity of Platinized Carbon Electrode via NaBH4 Treatment 원문보기

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NaBH4 화학적 처리를 통한 백금화 카본 전극의 촉매반응 향상
Enhanced Electrocatalytic Activity of Platinized Carbon Electrode via NaBH4 Treatment 원문보기

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