探索2D MXene支撑的黑磷量子点在氢气和氧气逸出反应中的协同作用<a href="#fn1" title="可用电子补充信息（ESI）：补充数字和表格。参见DOI：10.1039 / c8ta08374f">†</a>,Journal of Materials Chemistry A

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探索2D MXene支撑的黑磷量子点在氢气和氧气逸出反应中的协同作用 †
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-10-12 00:00:00 , DOI: 10.1039/c8ta08374f
Xiao-Dong Zhu _{1,

2,

3,

4} , Ying Xie _{3,

4,

5,

6,

7} , Yi-Tao Liu _{4,

8,

9,

10,

11}

Affiliation

通过范德华斯自组装将黑磷量子点（BP QDs）轻松装载到MXene纳米片上。一方面，BP QD具有较大的表面积和丰富的活性位，提供了相当高的电催化活性。另一方面，MXene纳米片充当2D基板以限制BP QD，从而防止它们聚集并因此防止电解质进入。它们可以进一步提供出色的电子导电性和出色的结构坚固性。BP QD依次充当隔离物，以隔离纳米片，避免其重新堆叠，从而保护活性位点不致丢失。所得的BP QDs / MXene纳米杂化物作为双功能电催化剂，在碱性介质中的氢气和氧气逸出反应（HER / OER）中均表现出显着的协同作用。特别是360 mV（与RHE）和64.3毫伏分解的塔菲尔斜率^-1被用于OER实现的，和的超电势190毫伏（的与RHE）和83.0毫伏分解的塔菲尔斜率^-1的HER中的1.0M KOH溶液实现。这些值明显低于其组分（BP QD和MXene纳米片）的值，甚至接近商品化RuO ₂或Pt / C的值。当将BP QDs / MXene纳米杂化物同时用作整个电池中的阴极和阳极以进行总水分解时，电流密度为10 mA cm ^-2 在仅1.78 V的电势下即可迅速达到。另外，通过密度泛函理论计算从根本上探索了BP QDs / MXene纳米杂化物优异电催化性能的潜在机理。

"点击查看英文标题和摘要"

Exploring the synergy of 2D MXene-supported black phosphorus quantum dots in hydrogen and oxygen evolution reactions†

Black phosphorus quantum dots (BP QDs) are facilely loaded on MXene nanosheets through van der Waals self-assembly. On the one hand, the BP QDs possess large surface areas and abundant active sites, offering fairly high electrocatalytic activity. On the other hand, the MXene nanosheets serve as a 2D substrate to confine the BP QDs, preventing them from aggregation and, thus, electrolyte inaccessibility. They can further provide excellent electronic conductivity and superior structural robustness. The BP QDs, in turn, act as a spacer to isolate the nanosheets from restacking, thus preserving the active sites from being lost. The resulting BP QDs/MXene nanohybrids, as a bifunctional electrocatalyst, exhibit remarkable synergy in both hydrogen and oxygen evolution reactions (HER/OER) in alkaline media. Specifically, an overpotential of 360 mV (vs. RHE) and a Tafel slope of 64.3 mV dec⁻¹ are achieved for the OER, and an overpotential of 190 mV (vs. RHE) and a Tafel slope of 83.0 mV dec⁻¹ for the HER in 1.0 M KOH solution are achieved. These values are significantly lower than those of their components (BP QDs and MXene nanosheets) and even approach those of commercialized RuO₂ or Pt/C. When the BP QDs/MXene nanohybrids are employed as both the cathode and anode in a full cell for overall water splitting, a current density of 10 mA cm⁻² is quickly reached at a potential of only 1.78 V. Additionally, the underlying mechanism of the superior electrocatalytic performance of the BP QDs/MXene nanohybrids is fundamentally explored by density functional theory calculations.

更新日期：2018-10-12

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