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높은 산소과전압과 내구성의 이산화납전극 제조에 관한 연구
김재관,최병선,남종우 ( Jae Kwan Kim,Byun Sun Choi,Chong Woo Nam ) 한국공업화학회 1996 공업화학 Vol.7 No.6
α-pbO₂/IrO₂-TiO₂/Ti지지체상에 sodium lauryl sulfate 및 TiO₂ 분말을 첨가한 질산납 전해액에서 전착한 β-PbO₂층의 특성 및 성능을 XRD, SEM, cyclic voltammograms, 매크로전해를 이용하여 검토하였다. XRD분석결과 sodium lauryl sulfate 및 TiO₂분말의 존재하에 α-pbO₂/IrO₂-TiO₂/Ti지지체 위에 전착한 β-PbO₂층은 순수한 β-PbO₂층과 마찬가지로 정방정계구조를 나타냈다. SEM결과 sodium lauryl sulfate는 전착충의 결정입자크기를 작게 하는 경향을 보여준다. sodium lauryl sulfate 및 TiO₂분말의 존재하에 전착한 β-PbO₂전극은 KOH 및 HClO₄지지전해질에서 양극산화에 대한 산소과전압과 내구성을 크게 향상시켰다. 티타늄마드래스에 전착시킨 β-PbO₂전극을 이용하여 과염소산용액으로부터 오존발생에 대한 전극성능과 내구성을 검토하였다. HClO₄지지전해질에 sodium lauryl sulfate와 TiO₂분말을 첨가하여 α-pbO₂/IrO₂-TiO₂/Ti마드래스상에 전착한β-PbO₂전극이 가장 높은 전류효율과 내구성을 가짐을 확인하였다. The characteristic and performance of β-PbO₂ layer electrodeposited on α-PbO₂/IrO₂-TiO₂/Ti substrate by adding sodium lauryl sulfate and TiO₂powder in lead nitrate solution were investigated by using XRD, SEM, cyclic voltammograms, and macro-elctrolysis. Results of XRD analysis ascertain that β-PbO₂ layers electrodeposited in the presence of sodium lauryl sulfate and TiO₂powder on α-PbO₂/IrO₂-TiO₂/Ti substrate have the same tetragonal structure as pure β-PbO₂ layers. The SEM results show that sodium lauryl sulfate tend to diminish crystal size of the deposited layer. The β-PbO₂ electrode electrodeposited in the presence of sodium lauryl sulfate and TiO₂powder gives significantly improved oxygen overvoltage and durability for anodic oxidation in KOH and HClO₄supporting electrolyte. Electrode performance and durability for the evolution of ozone in perchloric acid solution have been investigated by using β-PbO₂ electrodes electrodeposited on Titanium madras^ . It was ascertained that the PbO₂ electrode electrodeposited on α-PbO₂/IrO₂-TiO₂/Ti madras^ by adding sodium lauryl sulfate and TiO₂ powder in HClO₄ supporting electrolyte had the highest current efficiency and durability.
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김재관,조희찬,최병선 ( Jae Kwan Kim,Hee Chan Cho,Byung Sun Choi ) 한국공업화학회 1997 응용화학 Vol.1 No.1
KEPRI is conducting a project for the separation of unburned carbon from fly ash with an objective of constructing a 30t/h commercial plant. To develop a separation scheme, fly ashes were collected from various power plants and analyzed for their physical characteristics. It was found that coarse fly particles were carbon rich and removal of these particles from bulk fly ash could reduce the LOI content to less than 3% at a yield over 70%. For this purpose, a sepecial type of cyclone with guide vanes was built to separate the coarse fly ash particles. Test results showed that a sample of fly ash with 6.0% LOI could be processed into a product containing 3.0% LOI. Generally though, the results were not as good as expected due to the inefficent size saparation and more importantly due to the break-up of the coarse carbon rich particles. Therefore, an additional measure is being taken to enhance the separation by incorporating the electrostatic forces.
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폐수처리용 전착 이산화납전극의 전해촉매활성 및 성능에 관한 연구
최병선,김재관 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
본 연구는 폐수처리를 위한 오존발생에 사용되는 높은 전해촉매활성과 내구성을 가지는 이 산화납전극을 제작하는데 목적이 있다. 티타늄 지지체상에 sodium lauryl sulfate, sodium dodecylbenzenesulfate와 같은 음이온 계면활성제를 HClO₄ 지지전해질에 첨가하여 전착한 β-PbO₂의 특성 및 전해촉매확성은 XRD, SEM, cyclic voltammograms, 매크로전해를 이용하여 검토하였다. XRD분석결과 음이온 계면활성의 존재하에 전착한 β-PbO₂ 필름은 순수한 β-PbO₂ 필름과 마찬가지로 정방정계구조를 나타냈다. SEM결과 음이온 계면활성제들은 전착층의 결정입자크기를 작게 하는 경향이 나타났다. 음이온 계면활성제의 존재하에 건착한 β-PbO₂ 전극은 1.0M H₂SO₄지지전해질에서 dimethyl sulfoxide, benzaldehyde의 양극산화에 대한 전해촉매활성을 향상시켰다. 전해촉매현상은 음이온 계면활성제를 전해액에 첨가할 때 전착층에 생성된 표면활성의 결과로 결론되어지며, 표면활성은 양극산소전달반응에서 전달되는 수산기라디칼을 흡착할 수 있는 표면사이트를 증가시켰다. 티타늄마드래스에 전착시킨 이산화납전극을 이용하여 과염소산용액으로부터 오존발생에 대한 전극성능과 내구성을 검토하였다. HClO₄ 지지전해질에 sodium lauryl sulfate 와 NaF를 첨가하여 전칙한 PbO₂ 전극이 가장 높은 전류효율과 내구성을 가짐을 확인하였다. This research is aimed to manufacturung, of lead dioxide electrode having high electrocatalytic activity and durability for the ozone evolution to treat waste water. The characteristics and electrocatalytic activities of β-PbO₂ deposited electrochemically on titanium substrate by added anionic surfactants such as sodium lauryl sulfate, sodium dodecylbenzene-sulfate in HClO₄ supporting electrolyte were investigated by using XRD, SEM, cyclic voltammograms, and macro-electrolysis. Results of XRD analysis ascertained that β-PbO₂ films electrodeposited in the presence of anionic surfactant have the same tetragonal structure as pure β-PbO₂ films. The SEM results showed that these anionic surfactants tend to diminish crystal size of the deposited layer. The β-PbO₂ electrodes electrodeposited in the presence of anonic surfactant improved significantly electrocatalytic activity for anodic oxidation of dimethyl sulfoxide, benzaldehyde in 1.0M H₂SO₄ supporting electrolyte. The observed electrocatalytic phenomenon is concluded to be the beneficial consequence of surface activity generated on deposited layer when anionic surfactant was added to electrolyte, and surface activity increased surface sites capable of adsorbing hydroxyl radical which are transferred in the anodic oxygen transfer reaction. Electrode performance and durability far the evolution of ozone in perchloric acid solution with using lead dioxide electrodes electrodeposited on titanium madras have been investigated. It was ascertained that the PbO₂electrode electrodeposited by adding sodium lauryl sulfate and NaF in HClO₄supporting electrolyte showed the highest current efficiency and durability.
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