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首页> 外文期刊>Catalysis science & technology >A mesoporous C,N-co doped Co-based phosphate ultrathin nanosheet derived from a phosphonate-based-MOF as an efficient electrocatalyst for water oxidation
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A mesoporous C,N-co doped Co-based phosphate ultrathin nanosheet derived from a phosphonate-based-MOF as an efficient electrocatalyst for water oxidation

机译：介孔C, N-co掺杂磷酸Co-based超薄nanosheet来自一个phosphonate-based-MOF作为一个有效的electrocatalyst水氧化

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摘要

The discovery of efficient and durable earth-abundant electrocatalysts for water splitting is highly desirable and is still a great challenge. Herein, we report a facile and simple approach to prepare amorphous, mesoporous C,N co-doped Co-phosphate ultrathin nanosheets via the one-step pyrolysis of a Co-based phosphate precursor with different kinds of coordinated atoms and a 2D layered structure. The resulting material supported on glassy carbon (GC) exhibited an excellent OER activity with a low overpotential of 291 mV, which is 21 mV lower than that of IrO2 catalyst on GC (312 mV) in the same alkaline solution, to afford 10 mA cm(-2). Besides, this electrocatalyst showed fast kinetics with a Tafel slope of 57 mV decade(-1) in a 1.0 M KOH electrolyte, and the polarization curve after continuous 2000 CV cycles showed a negligible difference, indicating its good stability in alkaline media. The highly efficient catalytic performance with long-term stability for OER could be attributed to the following advantages: C,N co-doping facilitates the charge transfer; the amorphous structure and ultrathin 2D nanosheet structure enhance the activity site density; mesoporous structure facilitates the diffusion of O-2. This study provides a new strategy for the design and synthesis of heteroatom-doped high performance electrocatalysts for water oxidation based on MOFs with different types of coordination atoms, such as N and O atoms in the MOFs precursor.
机译：有效的发现和耐用地球上充足electrocatalysts水分裂是非常可取的,仍然是一个巨大的挑战。简单的方法准备无定形,介孔C, N co-doped Co-phosphate超薄nanosheets通过一步热解Co-based磷酸与不同种类的前兆协调原子和二维层状结构。在玻璃碳产生的物质支持(GC)表现出一个优秀的OER活动了过电压低291 mV, 21个mV低比IrO2 GC (312 mV)的催化剂相同的碱性溶液,买得起马10厘米(2)。除此之外,这个electrocatalyst快速显示动力学的塔菲尔坡57 mV十年(1)1.0 KOH电解质,极化曲线连续2000年简历后循环显示微不足道的差异,说明其良好稳定在碱性介质。催化性能和长期稳定性OER可以归因于以下优点:C, N提出促进电荷转移;2 d nanosheet结构增强活动的网站密度;0 2的扩散。策略的设计和合成heteroatom-doped高性能electrocatalysts水氧化的基础上财政部与协调不同类型的原子,如财政部前体N和O原子。

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