탄소재료의 수소저장 가능성이 제기 되면서 수소저장에 적합한 재료의 제조나 표면처리 등의 연구에 의하여 수소저장량을 향상시키고자 하는 연구가 활발히 진행되고 있다. 본 연구에서는 고성능 수소저장 탄소재료를 개발하기 위하여 표면처리기술인 불소화처리와 니켈 도핑을 수행하고 BE...
탄소재료의 수소저장 가능성이 제기 되면서 수소저장에 적합한 재료의 제조나 표면처리 등의 연구에 의하여 수소저장량을 향상시키고자 하는 연구가 활발히 진행되고 있다. 본 연구에서는 고성능 수소저장 탄소재료를 개발하기 위하여 표면처리기술인 불소화처리와 니켈 도핑을 수행하고 BET법과 BJH 탈착식에 의하여 비표면적과 세공특성을 조사하였고, PCT곡선에 의한 부피법으로 수소저장량을 측정하였다. 연구결과에 의하면 불소(불소화처리조건; F_(2):N_(2)=0.1:0.9, 10min, Reaction Temperature=R.T.)에 의해 표면 처리한 ACF15의 경우 수소저장능이 303K, 100atm에서 1.65wt%로 14%향상되었으나 ACF10과 MSC30는 수소저장능이 감소되었다. 이는 ACF10과 MSC30의 비표면적과 미세세공이 크게 감소하여 나타난 결과로 생각된다. 또한 니켈 도핑한 탄소재료의 경우 수소저장량의 증가를 가져왔다. 특히, 6wt% 니켈을 도핑한 MSC30과 ACF15의 경우 303K, 100atm에서 수소저장능이 각각 2.28wt%, 2.90wt%로 원재료에 비해 2배 이상 증가하는 결과를 얻었다.
탄소재료의 수소저장 가능성이 제기 되면서 수소저장에 적합한 재료의 제조나 표면처리 등의 연구에 의하여 수소저장량을 향상시키고자 하는 연구가 활발히 진행되고 있다. 본 연구에서는 고성능 수소저장 탄소재료를 개발하기 위하여 표면처리기술인 불소화처리와 니켈 도핑을 수행하고 BET법과 BJH 탈착식에 의하여 비표면적과 세공특성을 조사하였고, PCT곡선에 의한 부피법으로 수소저장량을 측정하였다. 연구결과에 의하면 불소(불소화처리조건; F_(2):N_(2)=0.1:0.9, 10min, Reaction Temperature=R.T.)에 의해 표면 처리한 ACF15의 경우 수소저장능이 303K, 100atm에서 1.65wt%로 14%향상되었으나 ACF10과 MSC30는 수소저장능이 감소되었다. 이는 ACF10과 MSC30의 비표면적과 미세세공이 크게 감소하여 나타난 결과로 생각된다. 또한 니켈 도핑한 탄소재료의 경우 수소저장량의 증가를 가져왔다. 특히, 6wt% 니켈을 도핑한 MSC30과 ACF15의 경우 303K, 100atm에서 수소저장능이 각각 2.28wt%, 2.90wt%로 원재료에 비해 2배 이상 증가하는 결과를 얻었다.
This work reports a novel approach to the preparation of porous carbon fibers, which involves creation of mesopores and micropores by electrospinning PAN carbon precursor with silica particles. Porous carbon fibers were prepared by electrospinning using silica and successive HF solution treatment. T...
This work reports a novel approach to the preparation of porous carbon fibers, which involves creation of mesopores and micropores by electrospinning PAN carbon precursor with silica particles. Porous carbon fibers were prepared by electrospinning using silica and successive HF solution treatment. The morphology were porous carbon fiber with pores and channels connected to pores. The specific surface areas of resultant samples were increased with increasing silica amount. Porous carbon fibers having high mesopore volume ratio were obtained by electrospinning with silica particle. This process is thought to be useful and simple method, which is to form mesopore in the carbon fibers. Activated carbon fibers (ACFs) with high surface area and pore volume were modified by metal(Ni) doping and fluorination and investigated to hydrogen storage properties by volumetric method. We obtained that the micropore volume on ACFs were considerably increased with Ni doping. Therefor, hydrogen storage capacities were similarly increased. It could be confirmed that porous structure plays an important to determining the amounts of hydrogen adsorbed, compared with other Ni-doped carbon materials. But after fluorination treatment, although the microphone volume of ACF were decreased, their amounts of hydrogen storage were found to be much higher than those measured in the same conditions without fluorination. These results indicated that surface of ACFs after fluorination treatment may be strongly attracted hydrogen due to high hydrogen affinity of fluorine. Hence, it was proven that hydrogen storage capacity was related with micropore volumes and surface properties of carbon materials as well as specific surface areas.
This work reports a novel approach to the preparation of porous carbon fibers, which involves creation of mesopores and micropores by electrospinning PAN carbon precursor with silica particles. Porous carbon fibers were prepared by electrospinning using silica and successive HF solution treatment. The morphology were porous carbon fiber with pores and channels connected to pores. The specific surface areas of resultant samples were increased with increasing silica amount. Porous carbon fibers having high mesopore volume ratio were obtained by electrospinning with silica particle. This process is thought to be useful and simple method, which is to form mesopore in the carbon fibers. Activated carbon fibers (ACFs) with high surface area and pore volume were modified by metal(Ni) doping and fluorination and investigated to hydrogen storage properties by volumetric method. We obtained that the micropore volume on ACFs were considerably increased with Ni doping. Therefor, hydrogen storage capacities were similarly increased. It could be confirmed that porous structure plays an important to determining the amounts of hydrogen adsorbed, compared with other Ni-doped carbon materials. But after fluorination treatment, although the microphone volume of ACF were decreased, their amounts of hydrogen storage were found to be much higher than those measured in the same conditions without fluorination. These results indicated that surface of ACFs after fluorination treatment may be strongly attracted hydrogen due to high hydrogen affinity of fluorine. Hence, it was proven that hydrogen storage capacity was related with micropore volumes and surface properties of carbon materials as well as specific surface areas.
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