Li Hong, Ke Fei, Zhu Junfa
National Synchrotron Radiation Laboratory and Department of Chemical Physics, University of Science and Technology of China, Hefei 230029, China.
Department of Applied Chemistry, Anhui Agricultural University, Hefei 230036, China.
Nanomaterials (Basel). 2018 Feb 7;8(2):89. doi: 10.3390/nano8020089.
The development of a highly efficient and stable bifunctional electrocatalyst for water splitting is still a challenging issue in obtaining clean and sustainable chemical fuels. Herein, a novel bifunctional catalyst consisting of 2D transition-metal phosphide nanosheets with abundant reactive sites templated by Co-centered metal-organic framework nanosheets, denoted as CoP-NS/C, has been developed through a facile one-step low-temperature phosphidation process. The as-prepared CoP-NS/C has large specific surface area and ultrathin nanosheets morphology providing rich catalytic active sites. It shows excellent electrocatalytic performances for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in acidic and alkaline media, with the Tafel slopes of 59 and 64 mV/dec and a current density of 10 mA/cm² at the overpotentials of 140 and 292 mV, respectively, which are remarkably superior to those of CoP/C, CoP particles, and comparable to those of commercial noble-metal catalysts. In addition, the CoP-NS/C also shows good durability after a long-term test.
开发一种用于水分解的高效稳定双功能电催化剂，在获取清洁可持续化学燃料方面仍然是一个具有挑战性的问题。在此，通过简便的一步低温磷化工艺，开发了一种新型双功能催化剂，它由二维过渡金属磷化物纳米片组成，具有以钴为中心的金属有机框架纳米片为模板的丰富活性位点，记为CoP-NS/C。所制备的CoP-NS/C具有大比表面积和超薄纳米片形态，提供了丰富的催化活性位点。它在酸性和碱性介质中对析氢反应（HER）和析氧反应（OER）均表现出优异的电催化性能，塔菲尔斜率分别为59和64 mV/dec，在过电位为140和292 mV时电流密度为10 mA/cm²，显著优于CoP/C、CoP颗粒，与商业贵金属催化剂相当。此外，经过长期测试，CoP-NS/C也表现出良好的耐久性。
