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MoS2 Quantum Dots as Efficient Electrocatalyst for Hydrogen Evolution Reaction over a Wide pH Range
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-07-07 , DOI: 10.1021/acs.energyfuels.0c01283 Bishnupad Mohanty 1, 2 , Arijit Mitra 3 , Bijayalaxmi Jena 2 , Bikash Kumar Jena 1, 4
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-07-07 , DOI: 10.1021/acs.energyfuels.0c01283 Bishnupad Mohanty 1, 2 , Arijit Mitra 3 , Bijayalaxmi Jena 2 , Bikash Kumar Jena 1, 4
Affiliation
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The development of cost-effective and efficient catalysts via an environmentally friendly synthetic process has significance for future renewable energy storage and conversion systems. Molybdenum disulfide (MoS2) is a promising 2D-material and has received increasing attention due to its high HER activity. Still, the HER activity of MoS2 remains challenging in a wide pH range. Here, we demonstrate that small size MoS2 quantum dots (MSQDs) can serve as a highly electrochemically active and low-cost electrocatalyst for HER over a wide pH range (pH 0–14). The bottom-up strategy was developed to synthesize water-soluble MSQDs from a carbon-free single molecular precursor, avoiding the formations of unwanted carbon quantum dots (CQDs). By taking the structural benefit, the as-synthesized MSQDs exhibit lower overpotentials and a smaller Tafel slope in acidic, basic, and neutral medium. The catalysts show long-term stability in the entire pH range. This study provides a noble strategy to synthesize MSQDs for optimizing its HER activity.
中文翻译：
MoS 2量子点作为在宽pH范围内进行氢发生反应的高效电催化剂
通过环保的合成工艺开发经济高效的催化剂对未来的可再生能源存储和转化系统具有重要意义。二硫化钼（MoS 2）是一种很有前途的2D材料，由于其高HER活性而受到越来越多的关注。尽管如此，MoS 2的HER活性在很宽的pH范围内仍然具有挑战性。在这里，我们演示了小型MoS 2量子点（MSQD）可以在很宽的pH范围（pH 0-14）内用作HER的高度电化学活性和低成本电催化剂。开发了自下而上的策略，可以从无碳的单分子前体中合成水溶性MSQD，避免形成不需要的碳量子点（CQD）。通过利用结构优势，在酸性，碱性和中性介质中，合成后的MSQD表现出较低的过电势和较小的Tafel斜率。催化剂在整个pH范围内均显示出长期稳定性。这项研究提供了合成MSQD的最佳策略，以优化其HER活性。
更新日期：2020-08-20
中文翻译：
MoS 2量子点作为在宽pH范围内进行氢发生反应的高效电催化剂
通过环保的合成工艺开发经济高效的催化剂对未来的可再生能源存储和转化系统具有重要意义。二硫化钼（MoS 2）是一种很有前途的2D材料，由于其高HER活性而受到越来越多的关注。尽管如此，MoS 2的HER活性在很宽的pH范围内仍然具有挑战性。在这里，我们演示了小型MoS 2量子点（MSQD）可以在很宽的pH范围（pH 0-14）内用作HER的高度电化学活性和低成本电催化剂。开发了自下而上的策略，可以从无碳的单分子前体中合成水溶性MSQD，避免形成不需要的碳量子点（CQD）。通过利用结构优势，在酸性，碱性和中性介质中，合成后的MSQD表现出较低的过电势和较小的Tafel斜率。催化剂在整个pH范围内均显示出长期稳定性。这项研究提供了合成MSQD的最佳策略，以优化其HER活性。
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