Li Fajun, Jiang Minghang, Lai Changgan, Xu Haifeng, Zhang Keying, Jin Zhong
MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, People's Republic of China.
School of Chemistry and Chemical Engineering, Suzhou University, Suzhou, Anhui 234000, People's Republic of China.
Nano Lett. 2022 Sep 14;22(17):7238-7245. doi: 10.1021/acs.nanolett.2c02755. Epub 2022 Aug 30.
The construction of low-cost, highly efficient, and stable electrocatalysts is a significant challenge for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we report a facile strategy to fabricate ultrathin metal-organic framework (MOF) nanosheet arrays doped with two rare-earth elements, Y and Ce, and self-supported on nickel foam (NF) to enhance the HER and OER performance by constructing abundant active sites and bimetallic synergistic effects. The NiYCe-MOF/NF features an ultrathin nanosheet array structure and is uniformly and richly codoped by Y and Ce. When it was explored as both the anode and cathode electrocatalysts for overall water splitting, it achieved 10 mA cm at 136 and 245 mV for the HER and OER in an alkaline electrolyte, respectively. Notably, an extremely low cell voltage of 1.54 V was required to achieve 100 mA cm in 1.0 M KOH solution, making it a promising substitute for noble-metal catalysts.
构建低成本、高效且稳定的电催化剂对于析氢反应（HER）和析氧反应（OER）而言是一项重大挑战。在此，我们报道了一种简便的策略，用于制备掺杂有两种稀土元素钇（Y）和铈（Ce）的超薄金属有机框架（MOF）纳米片阵列，并使其自支撑于泡沫镍（NF）上，通过构建丰富的活性位点和双金属协同效应来提升HER和OER性能。NiYCe-MOF/NF具有超薄纳米片阵列结构，且被Y和Ce均匀且大量地共掺杂。当将其用作全水解的阳极和阴极电催化剂时，在碱性电解质中，HER和OER分别在136和245 mV下实现了10 mA cm 。值得注意的是，在1.0 M KOH溶液中实现100 mA cm 需要极低的电池电压1.54 V，这使其成为贵金属催化剂的一个有前景的替代品。
