Mo Yufan, Du Dongdong, Du Yiyun, Feng Yongjun, Tang Pinggui, Li Dianqing
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
State Nuclear Electric Power Planning Design & Research Institute Co., Ltd., State Nuclear Power Technology Corporation: SPIC, Beijing 100095, China.
J Colloid Interface Sci. 2024 Apr;659:697-706. doi: 10.1016/j.jcis.2024.01.018. Epub 2024 Jan 7.
Developing highly active electrocatalysts for overall water splitting is of remarkable significance for industrial production of H. Herein, exceptionally active Fe(OH) modified ultra-small Ru nanoparticles on Ni(OH) nanosheets array (Fe(OH)-Ru/Ni(OH)) for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are reported. The Fe(OH)-Ru/Ni(OH) nanosheets array prepared with Fe/Ru molar ratio of 5 only requires extremely low overpotentials of 61, 127 and 170 mV to reach current densities of 100, 500 and 800 mA cm in 1 M KOH, respectively, exceeding Pt/C catalyst (75, 160 and 177 mV). Meanwhile, the Fe(OH)/Ni(OH) nanosheets array derived from Fe(OH)-Ru/Ni(OH) exhibits excellent OER activity. It gains current densities of 100, 500 and 800 mA cm at considerably low overpotentials of 265, 285 and 296 mV, respectively, much lower than those of RuO and most reported electrocatalysts. The introduction of Fe(OH) significantly improves the HER activity of Ru nanoparticles by tunning the electronic structure and forming interfaces between Ru and Fe(OH). Dramatically, the integrated alkaline electrolyzer based on Fe(OH)-Ru/Ni(OH) and Fe(OH)/Ni(OH) nanosheets array pair just needs 1.649 V to yield a current density up to 500 mA cm, exceeding most reported water-splitting electrocatalysts. The strategy reported in this work can be facilely extended to prepare other similar Ru based materials and their derivatives with outstanding catalytic performance for water splitting.
开发用于全水解的高活性电催化剂对氢气的工业生产具有重要意义。在此，报道了在Ni(OH)纳米片阵列（Fe(OH)-Ru/Ni(OH)）上具有异常活性的Fe(OH)修饰的超小Ru纳米颗粒，用于析氢反应（HER）和析氧反应（OER）。以Fe/Ru摩尔比为5制备的Fe(OH)-Ru/Ni(OH)纳米片阵列在1 M KOH中分别达到100、500和800 mA cm的电流密度时，仅需要极低的过电位61、127和170 mV，超过了Pt/C催化剂（75、160和177 mV）。同时，由Fe(OH)-Ru/Ni(OH)衍生的Fe(OH)/Ni(OH)纳米片阵列表现出优异的OER活性。它在相当低的过电位265、285和296 mV下分别获得100、500和800 mA cm的电流密度，远低于RuO和大多数报道的电催化剂。Fe(OH)的引入通过调整电子结构和在Ru与Fe(OH)之间形成界面，显著提高了Ru纳米颗粒的HER活性。引人注目的是，基于Fe(OH)-Ru/Ni(OH)和Fe(OH)/Ni(OH)纳米片阵列对的集成碱性电解槽仅需1.649 V就能产生高达500 mA cm的电流密度，超过了大多数报道的水分解电催化剂。这项工作中报道的策略可以很容易地扩展到制备其他具有出色水分解催化性能的类似Ru基材料及其衍生物。
