• 전기화학회지
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• 제2권3호
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• pp.134-137
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• 1999

Penol-formaldehyde의 열처리에 의해 제조된 polyacenic semiconductor material(PAS) 전극은 유용한 전극중의 하나이다. 리튬 충전지의 음극물질로서 무정형 탄소재료들은 그들의 높은 전기 화학적 성능과 수명 때문에 활발히 연구되어 왔다. 탄소재료들은 Li 전극에 있어서 가장 중요한 문제중의 하나인 Li dendrite의 형성을 초래하지 않는다. PAS는 Li cluster의 해방 없이 $C_2Li$상태로의 높은 Li-doped를 보이는 상대적으로 낮은 온도$(550\~750^{\circ}C)$에서 페놀 레진으로 부터 제조되었다. 우리는 다양한 온도에서 PAS를 제조하고 제조된 시료의 전기 화학적 성질들에 관해 연구를 했다. 우리는 $0.24\~0.4$범위인 [H]/[C]몰비를 변화시키려 노력했다. PAS의 전기화학적 성질을 고려할 때, PAS재료는 고분자전지의 전극에 적합한 물질이다.

• 농업과학연구
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• 제44권3호
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• pp.359-365
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• 2017

Biochar has the ability to mitigate climate change, improve crop productivity, and adsorb various contaminants. The aim of this work was to confirm the effect of biochar as a soil amendment on growth of Chinese cabbage (Brassica chinensis) using a pot experiment. Biochar was produced from residual-wood burnt at a pyrolytic temperature of $400^{\circ}C$ and consisted of 51.6 % carbon (C) by mass. The biochar was added to the soil at 0, 1, 3, and 5% by weight, which represent about 0, 18, 54, and $90t\;ha^{-1}$, respectively. The treatments were arranged in a randomized complete block design with 3 replications. The Chinese cabbage was grown for 49 days in a glasshouse in pots filled with sandy loam soil. Experimental results showed that the residual-wood biochar used for the experiment was slightly alkaline (pH 7.5). The fresh weights of Chinese cabbage were 86.22 g, 84.1 g, 63.23 g and 70.87 g, respectively, for biochar applications at 0, 18, 54, and $90t\;ha^{-1}$. Compared with the control (i.e., no biochar), biochar application increased soil pH and electrical conductivity (EC). Addition of biochar (54 and $90t\;ha^{-1}$) to sandy loam soil had no effect on growth of Chinese cabbage. This might be due to excessive increase of soil pH from the biochar application, leading to reduced availability of plant nutrients. Based on these results, the authors conclude that an excessive addition of biochar may have negative effects on the healthy growth of Chinese cabbage.