Liang Xiao, Xiao Hong, Zhang Tengfei, Zhang Fanchao, Gao Qiuming
Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Chemistry, Beihang University, Beijing 100191, PR China.
Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Chemistry, Beihang University, Beijing 100191, PR China.
J Colloid Interface Sci. 2023 Jan 15;630(Pt A):170-181. doi: 10.1016/j.jcis.2022.10.001. Epub 2022 Oct 7.
A unique nanocomposite of FeCo-NSCC (means FeCo nanoalloy anchored on N, S co-doped carbonaceous composite) is obtained by one-pot pyrolysis using mixed natural wool fibers, dicyandiamide and the corresponding metal salts. The FeCo-NSCC has a higher degree of graphitization and a high specific surface area of 359 m g. The FeCo-NSCC exhibits a promising bifunctional oxygen reduction reaction/oxygen evolution reaction (OER/ORR) electrocatalytic activity with onset potential and half-wave potentials of 0.980 and 0.853 V vs reversible hydrogen electrode for ORR, and a low overpotential of 351 mV at 10 mA cm for OER, superior to that of state-of-the-art commercial Pt/C and RuO. The FeCo-NSCC presents a vigorous bifunctional OER/ORR electrocatalytic activities with the low ΔE(E - E) of 0.727 V, superior to most of the reported non-noble metal-based catalysts. Besides, the FeCo-NSCC shows remarkable durability and methanol resistance. The FeCo-NSCC based battery works at an open circuit voltage of 1.52 V and has a maximum power density of 161 mW cm at current density of 246 mA cm, better than those of Pt/C-RuO based battery (1.47 V; 106 mW cm, 145 mA cm). The FeCo-NSCC based battery is stable with no obvious increased voltage gap after 60 h cycles.
通过使用混合天然羊毛纤维、双氰胺和相应的金属盐进行一锅热解，获得了一种独特的FeCo-NSCC纳米复合材料（即锚定在N、S共掺杂碳质复合材料上的FeCo纳米合金）。FeCo-NSCC具有更高的石墨化程度和359 m²/g的高比表面积。FeCo-NSCC表现出有前景的双功能氧还原反应/析氧反应（OER/ORR）电催化活性，对于ORR，相对于可逆氢电极的起始电位和半波电位分别为0.980和0.853 V，对于OER，在10 mA/cm²时过电位低至351 mV，优于最先进的商业Pt/C和RuO₂。FeCo-NSCC呈现出强烈的双功能OER/ORR电催化活性，其低ΔE（E₁/₂ - E₀）为0.727 V，优于大多数已报道的非贵金属基催化剂。此外，FeCo-NSCC表现出卓越的耐久性和抗甲醇性。基于FeCo-NSCC的电池在开路电压为1.52 V下工作，在电流密度为246 mA/cm²时最大功率密度为161 mW/cm²，优于基于Pt/C-RuO₂的电池（1.47 V；106 mW/cm²，145 mA/cm²）。基于FeCo-NSCC的电池稳定，在60小时循环后电压间隙没有明显增加。
