Yu Jie, Zhang Tao, Sun Yiqiang, Li Xuejiao, Li Xinyang, Wu Bo, Men Dandan, Li Yue
Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China.
University of Science and Technology of China, Hefei 230026, P. R. China.
ACS Appl Mater Interfaces. 2020 Mar 18;12(11):12783-12792. doi: 10.1021/acsami.9b21927. Epub 2020 Mar 9.
We develop a method to prepare hollow FeP/FeO hybrid nanoparticles supported on carbon nanotubes (CNTs), which could be used as highly active and efficient electrocatalysts. The Fe@FeO/CNT hybrids were first synthesized by annealing the CNTs adsorbed with Fe(NO), followed by controlled phosphorization treatment. They exhibit an outstanding catalytic activity for oxygen evolution reaction (OER) with a low overpotential of 229 mV at a current density of 10 mA cm, a high turnover frequency value of 0.35 s at an overpotential of 300 mV, and an ultralow Tafel slope of 27.6 mV dec, which is much better than that of FeP/FeO, FeP/CNTs, FeO/CNTs, and the commercial RuO electrocatalyst. More importantly, the Tafel slope is much lower than most non-noble metal-based OER electrocatalysts reported in the previous literature studies as far as we know. The excellent OER performance benefits from the electron transfer from FeO to FeP confirmed by X-ray photoelectron spectroscopy, together with good conductivity of CNTs. This hybrid structure supported on conductive CNTs may offer an efficient method to design earth-abundant and low-cost electrocatalysts for OER in practical applications.
我们开发了一种制备负载在碳纳米管（CNT）上的中空FeP/FeO杂化纳米颗粒的方法，该纳米颗粒可用作高活性和高效的电催化剂。首先通过对吸附有Fe(NO)的碳纳米管进行退火，然后进行可控的磷化处理，合成了Fe@FeO/CNT杂化物。它们对析氧反应（OER）表现出出色的催化活性，在电流密度为10 mA cm时过电位低至229 mV，在过电位为300 mV时周转频率值高达0.35 s，塔菲尔斜率低至27.6 mV dec，远优于FeP/FeO、FeP/CNT、FeO/CNT和商业RuO电催化剂。更重要的是，据我们所知，该塔菲尔斜率远低于先前文献研究中报道的大多数非贵金属基OER电催化剂。X射线光电子能谱证实，优异的OER性能得益于从FeO到FeP的电子转移，以及碳纳米管良好的导电性。这种负载在导电碳纳米管上的杂化结构可能为在实际应用中设计储量丰富且低成本的OER电催化剂提供一种有效方法。
