MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
Dalton Trans. 2018 Oct 23;47(41):14679-14685. doi: 10.1039/c8dt02706d.
Searching for highly active and stable bifunctional electrocatalysts for overall water splitting, e.g., for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), is dominating in terms of bringing future renewable energy storage and conversion processes to reality. In this work, a kind of two-dimensional ultrathin manganese (Mn) doped polyhedral cobalt phosphide (Mn-CoP) has been synthesized via the etching-carbonization-phosphidation of Co-centered metal-organic frameworks. The as-prepared porous Mn-CoP nanosheets had a larger specific surface area and higher porosity, furnishing them with more plentiful catalytically active sites than their counterpart hollow CoP and Mn-CoP nanoparticles, and thus showed much better electrocatalytic activity for both HER and OER in acidic and alkaline media. In addition, the Mn-CoP nanosheets also demonstrated excellent durability after long-term operation. These high performances are attributed to the synergistic effects of the CoP nanosheets with intrinsic activity, the graphitic carbon and the controllable electronic structure doped by Mn and N elements. This synthetic methodology of using a classical MOF as a precursor to build a new 2D sheet-like composite may create opportunities to search for highly efficient and robust non-precious metal catalysts for energy-related reactions.
寻找高效稳定的双功能电催化剂用于整体水分解，例如用于析氢反应（HER）和析氧反应（OER），对于将未来的可再生能源存储和转化过程变为现实至关重要。在这项工作中，通过 Co 中心金属有机骨架的刻蚀-碳化-磷化合成了一种二维超薄的锰掺杂多面钴磷化物（Mn-CoP）。所制备的多孔 Mn-CoP 纳米片具有更大的比表面积和更高的孔隙率，与它们的空心 CoP 和 Mn-CoP 纳米颗粒相比，提供了更多丰富的催化活性位点，因此在酸性和碱性介质中对 HER 和 OER 均表现出更好的电催化活性。此外，Mn-CoP 纳米片在长期运行后也表现出优异的耐久性。这些高性能归因于 CoP 纳米片固有的活性、石墨碳以及 Mn 和 N 元素掺杂的可控电子结构的协同作用。这种使用经典 MOF 作为前体制备新型二维片状复合材料的合成方法可能为寻找高效、稳定的非贵金属能源相关反应催化剂提供了机会。
