물 분해 과정에서 효율적인 촉매 특성을 보이는 Co3O4 nanocubes 합성
Synthesis of Co3O4 Nanocubes as an Efficient Electrocatalysts for the Oxygen Evolution Reacitons
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초록
고효율의 물 분해 시스템은 수소 발생 반응(HER)과 산소 발생 반응(OER) 각각에서의 촉매로 인한 전기화학적 반응에서의 효율로 인해 향상되는 높은 과전압의 감소가 수반되어야 한다. 그 중에서도 전이 금속 기반의 화합물(산화물, 황화물, 인화물, 그리고 질화물)은 현재 상용되고 있는 귀금속을 대체할 촉매 재료로써 주목받고 있다. 본 연구에서, 우리는 FESEM 분석을 통해 최적의 단분산된 Co3[Co(CN)6]2 PBAs를 합성하고 XRD, FT-IR 분석을 통하여 결정성을 확인하고 TG-DTA를 통해 PBAs의 열적 거동을 확인하였다. 그리고 합성된 최적의 Co3[Co(CN)6]2 PBAs를 열처리해서 단분산된 Co3O4 나노 큐브를 합성하였고 XRD를 통해 이의 결정성을 확인하고 OER 측정을 진행하였다. 최종적으로 합성된 Co3O4 나노 큐브는 10 mA∙cm-2의 전류 밀도에서 312 mV의 낮은 과전압과 96.6 mV∙dec-1의 낮은 Tafel slope을 보인다.
Abstract
The high efficient water splitting system should involve the reduction of high overpotential value, which was enhanced by the electrocatalytic reaction efficiency of catalysts, during the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) reaction, respectively. Among them, transition metal-based compounds (oxides, sulfides, phosphides, and nitrides) are attracting attention as catalyst materials to replace noble metals that are currently commercially available. Herein, we synthesized optimal monodisperse Co3[Co(CN)6]2 PBAs by FESEM, and confirmed crystallinity by XRD and FT-IR, and thermal behavior of PBAs via TG-DTA. Also, we synthesized monodispersed Co3O4 nanocubes by calcination of Co3[Co(CN)6]2 PBAs, confirmed the crystallinity by XRD, and proceeded OER measurement. Finally, the synthesized Co3O4 nanocubes showed a low overpotential of 312 mV at a current density of 10 mA∙cm-2 with a low Tafel plot (96.6 mV∙dec-1).
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