Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry , Tsinghua University , Beijing 100084 , China.
College of Chemistry and Materials Science , Northwest University , Xi'an 710069 , China.
ACS Appl Mater Interfaces. 2018 Mar 21;10(11):9407-9414. doi: 10.1021/acsami.7b18875. Epub 2018 Mar 9.
Development of efficient electrocatalysts for oxygen evolution reaction (OER) is of great significance for future renewable energy applications. Herein, efficient OER electrocatalysts based on iron hydroxide-modified nickel hydroxylphosphate (NiPO/Fe(OH) ) single-wall nanotubes (SWNTs) have been prepared by a facile stepwise surfactant-free solvothermal strategy, which possess diameters of about 6 nm and lengths of about several micrometers. Benefiting from the synergistic effect between iron hydroxides and NiPO SWNTs, the as-prepared NiPO/Fe(OH) SWNTs exhibit higher OER activity than primary NiPO SWNTs. Furthermore, the OER activity with different Fe contents displays a volcano-type shape, and the optimized NiPO/Fe(OH) SWNTs present excellent activity with a low overpotential of 248 mV to deliver a current density of 10 mA cm and 323 mV to achieve a large current density of 100 mA cm, as well as a remarkably low Tafel slope of 45.4 mV dec in 1 M KOH electrolyte. The present work provides valuable insights to improve the OER performance by rational surface modification.
用于氧气析出反应 (OER) 的高效电催化剂的开发对于未来的可再生能源应用具有重要意义。在此，通过简便的无表面活性剂分步溶剂热策略制备了基于氢氧化铁修饰的羟基磷酸镍（NiPO/Fe(OH) ）单壁纳米管（SWNTs）的高效 OER 电催化剂，其直径约为 6nm，长度约为数微米。得益于氢氧化铁和 NiPO SWNTs 之间的协同作用，所制备的 NiPO/Fe(OH) SWNTs 表现出比原始 NiPO SWNTs 更高的 OER 活性。此外，具有不同 Fe 含量的 OER 活性呈现火山型形状，优化的 NiPO/Fe(OH) SWNTs 在 1M KOH 电解质中表现出优异的活性，其过电位低至 248mV 即可达到 10mA cm 的电流密度，323mV 即可达到 100mA cm 的大电流密度，塔菲尔斜率低至 45.4 mV dec。本工作为通过合理的表面修饰来提高 OER 性能提供了有价值的见解。
