Yang Zhou, Yang Runmiao, Dong Guanxiu, Xiang Meng, Hui Jia, Ou Junfei, Qin Hengfei
Department of Material Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China.
Engineering Technology and Materials Research Center, China Academy of Transportation Sciences, Beijing 100029, P. R. China.
ACS Omega. 2021 Jan 14;6(3):2066-2073. doi: 10.1021/acsomega.0c05018. eCollection 2021 Jan 26.
Water splitting is the most potential method to produce hydrogen energy, however, the conventional electrocatalysts encounter the hindrances of high overpotential and low hydrogen production efficiency. Herein, we report a carbon-based nanocomposite (denoted as CCW-, stands for the calcination temperature) derived from watermelon peels and CoCl, and the as-synthesized CCW- is used as the electrocatalyst. The overpotential and the Tafel slope of CCW-700 for oxygen evolution reaction (OER) is 237 mV at 10 mA cm and 69.8 mV dec, respectively, both of which are lower than those of commercial RuO. For hydrogen evolution reaction (HER), the overpotential of CCW-700 (111 mV) is higher than that of the widely studied Pt/C (73 mV) but still lower than those of lots of carbon-based nanomaterials (122-177 mV). In the light of CCW-700 is highly active for both OER and HER, we assembled a water-splitting electrocatalyst by employing nickel foam loaded with CCW-700 as the anode and cathode in 1 M KOH. The water-splitting voltage is only 1.54 V for the CCW-700//CCW-700 electrodes and 1.62 V for the RuO//Pt/C ones. Therefore, the so-denoted CCW- powder possesses good electrocatalytic hydrogen production efficiency.
水分解是生产氢能最具潜力的方法，然而，传统的电催化剂面临着高过电位和低产氢效率的障碍。在此，我们报道了一种由西瓜皮和CoCl衍生的碳基纳米复合材料（表示为CCW-，代表煅烧温度），合成的CCW-用作电催化剂。CCW-700用于析氧反应（OER）的过电位和塔菲尔斜率在10 mA cm时分别为237 mV和69.8 mV dec，均低于商业RuO。对于析氢反应（HER），CCW-700的过电位（111 mV）高于广泛研究的Pt/C（73 mV），但仍低于许多碳基纳米材料（122 - 177 mV）。鉴于CCW-700对OER和HER都具有高活性，我们通过在1 M KOH中使用负载CCW-700的泡沫镍作为阳极和阴极组装了一种水分解电催化剂。CCW-700//CCW-700电极的水分解电压仅为1.54 V，RuO//Pt/C电极的水分解电压为1.62 V。因此，所谓的CCW-粉末具有良好的电催化产氢效率。
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