Effects of applied voltage and temperature on the electrochemical production of carbon powders from CO2 in molten salt with an inert anode
Effects of applied voltage and temperature on the electrochemical production of carbon powders from CO2 in molten salt with an inert anode
复制标题
施加电压和温度对惰性阳极熔盐中 CO2 电化学生产碳粉的影响
DOI：
10.1016/j.electacta.2013.10.109
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发表时间：
2013-12
影响因子：
6.6
通讯作者：
D.H. Wang
中科院分区：
文献类型：
--
作者：
Diyong Tang;Huayi Yin;Xuhui Mao;Wei Xiao;D.H. Wang
在450 °C ~ 650 °C的温度范围内，以SnO 2为惰性阳极，在3.0 V ~ 6.0 V的电解电压范围内，利用Li 2CO 3-Na 2CO 3-K2 CO 3共晶熔体中CO2的电化学转化，成功地在镍阴极上沉积了无定形炭粉末。系统研究了电解温度和槽电压对产物炭形貌和结构的影响，以及对过程能耗的影响。电解槽电压和温度对炭产物的形貌和粒度有影响。随着电解条件的变化，沉积的碳呈现出不同的形态，包括纳米颗粒、纳米片、纳米片和心形纳米结构笼等。在较高的槽电压和较低的电解温度下，可得到粒径较小的颗粒。在450 °C下在5.5V下获得的碳产物表现出868.3m2g-1的最高BET表面积。红外光谱分析表明，含氧官能团出现在碳产品的表面，这很可能是由于活性悬挂键的碳材料。在450 °C、3.5V恒定电池电压下，生产1 kg碳的优化能耗低至35.59 kW·h，电流效率为87.86%。
With a SnO2inert anode, amorphous carbon powders were successfully deposited on a nickel cathode by electrochemical conversion of CO2in Li2CO3–Na2CO3–K2CO3eutectic melt in the temperature range of 450 °C to 650 °C and under the electrolysis voltages of 3.0 V to 6.0 V. The effects of electrolysis temperature and cell voltage on the morphology and structure of the produced carbon, and on the energy consumption of the process were systematically investigated. The morphologies and particle size of the carbon products were proven to be affected by the electrolysis cell voltage and temperature. As the electrolysis condition varied, the deposited carbon exhibited different forms, including nanoparticle, nanoflake, nanosheet and heart-shape nanostructured cage, etc. The particle sizes of the obtained carbon ranged from av. 2 μm to 50 nm, and smaller particles were obtained at higher cell voltage and lower electrolysis temperature. The carbon product obtained at 450 °C under 5.5 V exhibited the highest BET surface area of 868.3 m2g−1. FTIR analysis demonstrated that oxygen-containing functional groups presented on the surface of the carbon product, which was most likely due to the active dangling bond on the carbon materials. The optimized energy consumption for producing 1 kg of carbon is as low as 35.59 kW h with a current efficiency of 87.86% at 450 °C under a constant cell voltage of 3.5 V.
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