Yousef Ahmed K, Kim Yena, Bhanja Piyali, Mei Peng, Pramanik Malay, Sanad M M S, Rashad M M, El-Sayed A Y, Alshehri Abdulmohsen Ali, Alghamdi Yousef Gamaan, Alzahrani Khalid Ahmed, Ide Yusuke, Lin Jianjian, Yamauchi Yusuke
Chemistry Department, Faculty of Science, Al-Azhar University Assiut Branch 71524 Assiut Egypt.
Key Laboratory of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology Qingdao 266042 China.
RSC Adv. 2019 Aug 13;9(43):25240-25247. doi: 10.1039/c9ra04326h. eCollection 2019 Aug 8.
Inspired by their distinctive properties, transition metal phosphides have gained immense attention as promising electrode materials for energy storage and conversion applications. The introduction of a safe and large-scale method of synthesizing a composite of these materials with carbon is of great significance in the fields of electrochemical and materials sciences. In the current effort, we successfully synthesize an iron phosphide/carbon (FeP/C) with a high specific surface area by the pyrolysis of the gel resulting from the hydrothermal treatment of an iron nitrate-phytic acid mixed solution. In comparison with the blank (P/C), the as-synthesized FeP/C appears to be an efficient electrode material for supercapacitor as well as oxygen reduction reaction (ORR) applications in an alkaline medium in a three-electrode system. In the study of supercapacitors, FeP/C shows areal capacitance of 313 mF cm at 1.2 mA cm while retaining 95% of its initial capacitance value after 10 000 cycles, while in the ORR, the synthesized material exhibits high electrocatalytic activity with an onset potential of 0.86 V RHE through the preferred four-electron pathway and less than 6% HO production calculated in the potential range of 0.0-0.7 V RHE. The stability is found to be better than those of the benchmark Pt/C (20 wt%) catalyst.
受其独特性能的启发，过渡金属磷化物作为有前途的储能和转换应用电极材料受到了广泛关注。引入一种安全且大规模的合成这些材料与碳复合材料的方法在电化学和材料科学领域具有重要意义。在当前的工作中，我们通过对硝酸铁 - 植酸混合溶液进行水热处理得到的凝胶进行热解，成功合成了具有高比表面积的磷化铁/碳（FeP/C）。与空白样（P/C）相比，合成的FeP/C在三电极体系的碱性介质中似乎是超级电容器以及氧还原反应（ORR）应用的高效电极材料。在超级电容器研究中，FeP/C在1.2 mA cm时的面积电容为313 mF cm，在10000次循环后仍保留其初始电容值的95%，而在ORR中，合成材料表现出高电催化活性，通过优选的四电子途径，起始电位为0.86 V RHE，在0.0 - 0.7 V RHE电位范围内计算的HO生成量小于6%。发现其稳定性优于基准Pt/C（20 wt%）催化剂。
