Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry, Tsinghua University , Beijing 100084, China.
ACS Appl Mater Interfaces. 2016 Jan 27;8(3):2158-65. doi: 10.1021/acsami.5b10727. Epub 2016 Jan 12.
The development of efficient and low-cost hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalysts for renewable-energy conversion techniques is highly desired. A kind of hollow polyhedral cobalt phosphide (CoP hollow polyhedron) is developed as efficient bifunctional electrocatalysts for HER and OER templated by Co-centered metal-organic frameworks. The as-prepared CoP hollow polyhedron, which have large specific surface area and high porosity providing rich catalytic active sites, show excellent electrocatalytic performances for both HER and OER in acidic and alkaline media, respectively, with onset overpotentials of 35 and 300 mV, Tafel slopes of 59 and 57 mV dec(-1), and a current density of 10 mA cm(-2) at overpotentials of 159 and 400 mV for HER and OER, respectively, which are remarkably superior to those of particulate CoP (CoP particles) and comparable to those of commercial noble-metal catalysts. In addition, the CoP hollow polyhedron also show good durability after long-term operations.
开发高效、低成本的析氢反应（HER）和析氧反应（OER）电催化剂对于可再生能源转化技术至关重要。本文开发了一种中空多面体钴磷化物（CoP 中空多面体）作为高效双功能电催化剂，其模板为 Co 中心的金属有机框架。所制备的 CoP 中空多面体具有大的比表面积和高的孔隙率，提供了丰富的催化活性位点，在酸性和碱性介质中分别对 HER 和 OER 表现出优异的电催化性能，HER 和 OER 的起始过电势分别为 35 mV 和 300 mV，Tafel 斜率分别为 59 mV dec(-1)和 57 mV dec(-1)，在 159 mV 和 400 mV 的过电势下，HER 和 OER 的电流密度分别为 10 mA cm(-2)，明显优于颗粒状 CoP（CoP 颗粒），与商业贵金属催化剂相当。此外，CoP 中空多面体在长期运行后也表现出良好的耐久性。
