CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Small. 2017 Apr;13(16). doi: 10.1002/smll.201603706. Epub 2017 Feb 6.
The rational design of Earth abundant electrocatalysts for efficiently catalyzing hydrogen evolution reaction (HER) is believed to lead to the generation of carbon neutral energy carrier. Owing to their fascinating chemical and physical properties, transition metal dichalcogenides (TMDs) are widely studied for this purpose. Of particular note is that doping by foreign atom can bring the advent of electronic perturbation, which affects the intrinsic catalytic property. Hence, through doping, the catalytic activity of such materials could be boosted. A rational synthesis approach that enables phosphorous atom to be doped into WS without inducing phase impurity to form WS P nanoribbon (NRs) is herein reported. It is found that the WS P NRs exhibit considerably enhanced HER performance, requiring only -98 mV versus reversible hydrogen electrode to achieve a current density of -10 mA cm . Such a high performance can be attributed to the ease of H-atom adsorption and desorption due to intrinsically tuned WS , and partial formation of NRs, a morphology wherein the exposure of active edges is more pronounced. This finding can provide a fertile ground for subsequent works aiming at tuning intrinsic catalytic activity of TMDs.
理性设计丰富的地球电催化剂，有效地催化析氢反应（HER），有望生成碳中性的能量载体。由于过渡金属二硫属化物（TMDs）具有迷人的化学和物理性质，因此被广泛研究用于此目的。值得注意的是，掺杂外来原子会带来电子扰动，从而影响内在的催化性能。因此，通过掺杂，可以提高这些材料的催化活性。本文报道了一种合理的合成方法，可将磷原子掺杂到 WS 中，而不会引入相杂质形成 WS P 纳米带（NRs）。研究发现，WS P NRs 表现出相当高的 HER 性能，仅需相对于可逆氢电极 -98 mV 即可实现 -10 mA cm 的电流密度。这种高性能可归因于由于固有调谐的 WS 和部分形成 NRs ，使得 H 原子的吸附和脱附更容易，其中活性边缘的暴露更加明显。这一发现为后续旨在调节 TMDs 内在催化活性的工作提供了肥沃的土壤。
