Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2021-04-24 , DOI: 10.1016/j.cej.2021.129977
Chuan-Ling Zhang , Yan Xie , Jiang-Tao Liu , Fu-Hu Cao , Huai-Ping Cong , Hao Li
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Developing high-performance non-noble electrocatalysts for oxygen and hydrogen evolution reactions (OER and HER) is of great importance. Herein, an efficient 1D bifunctional electrocatalyst was constructed via a multistep strategy, which consisted of core-shell ZIF-8@ZIF-67 derived CoP/N-doped porous carbon nanotube anchored with vertically aligned MoS2 nanosheets (NCT@CoP@MoS2). Benefiting from the synergies between the unique 1D porous hollow heterostructure and the components, the tubular NCT@CoP@MoS2 composites showed superior electrocatalytic activity in 1 M KOH with an overpotential of ∼234 and 195 mV to achieve 10 mA·cm−2 for OER and HER, respectively. More importantly, the NCT@CoP@MoS2//NCT@CoP@MoS2 couple delivered high overall water splitting performance with an ultralow cell voltage of 1.57 and 1.85 V to achieve 10 and 200 mA·cm−2, only 70 and 40 mV higher than that of Pt/C//RuO2, respectively. Specifically, the as-prepared electrode exhibited ultra-stability for overall water splitting, and the current density only decreases by 4% at 1.6 V after 40 h of cycling.
中文翻译:
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一维核-壳MOF衍生的CoP纳米粒子-嵌入N掺杂的多孔碳纳米管,并以MoS 2纳米片作为有效的双功能电催化剂
开发用于氧气和氢气逸出反应(OER和HER)的高性能非贵金属电催化剂非常重要。本文中,通过多步策略构建了高效的一维双功能电催化剂,该催化剂由核壳ZIF-8 @ ZIF-67衍生的CoP / N掺杂的多孔碳纳米管锚定并垂直排列的MoS 2纳米片(NCT @ CoP @ MoS 2)。得益于独特的1D多孔空心异质结构与组分之间的协同作用,管状NCT @ CoP @ MoS 2复合材料在1 M KOH中表现出优异的电催化活性,其超电势约为234和195 mV,可达到10 mA·cm -2。 OER和HER。更重要的是,NCT @ CoP @ MoS 2 // NCT @ CoP @ MoS2对偶具有极高的总水分解性能,电池电压低至1.57和1.85 V,达到10和200 mA·cm -2,分别仅比Pt / C // RuO 2高70和40 mV 。具体而言,所制备的电极显示出对整个水分解的超稳定性,并且在循环40小时后,电流密度在1.6 V下仅降低了4%。