Hydrogen energy is considered to be a critical environmentally friendly and widely sourced renewable energy source that can be used as an alternative to fossil fuels. At present, the preparation of hydrogen (H₂) mainly depends on traditional fossil fuels. In order to achieve sustainable development of environmental protection, great attention has been paid to the preparation of H₂ by electrocatalysis, photocatalysis, and photoelectrochemistry. Here, it is reported for the first time that a novel active catalyst for the hydrogen evolution reaction, consisting of all‐2D amorphous nanosheets/2D crystal layer heterojunction structure and without any noble metal (no precious metals are present in the preparation or measuring), is almost entirely fabricated by laser ablation in liquid (LAL) growth of amorphous cobalt sulfide on the surface of multilayered molybdenum disulfide. In acidic media, the amorphous cobalt sulfide nanosheets/multilayered molybdenum disulfide (a‐CoS/MoS₂) catalyst exhibits fast hydrogen evolution kinetics with onset potential of −147 mV and a Tafel slope of 126 mV per decade, which is much better than only the amorphous cobalt sulfide and molybdenum disulfide layer. The high hydrogen evolution activity of the amorphous cobalt sulfide nanosheets/multilayered molybdenum disulfide hybrid is likely due to the unique electrocatalytic synergistic effects between hydrogen evolution‐active amorphous cobalt sulfide nanosheets and layered crystal molybdenum disulfide materials, as well as the much‐increased catalytic sites. This work provides a new general route based on all‐2D amorphous nanosheets/2D crystal structure for designing and preparing novel layered materials with effectively manipulated catalytic properties and active functionality surface.

中文翻译：

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用于电化学析氢的高效全二维非晶硫化钴纳米片/多层二硫化钼杂化异质结催化剂。


氢能被认为是一种重要的环保且来源广泛的可再生能源，可用作化石燃料的替代品。目前，氢气(H ₂ )的制备主要依靠传统的化石燃料。为了实现环境保护的可持续发展，电催化、光催化、光电化学制备H ₂受到了极大的关注。在此，首次报道了一种新型的析氢反应活性催化剂，由全二维非晶纳米片/二维晶层异质结结构组成，不含任何贵金属（制备或测量时均不存在贵金属） ，几乎完全是通过在多层二硫化钼表面上液态激光烧蚀（LAL）生长非晶态硫化钴而制成的。在酸性介质中，无定形硫化钴纳米片/多层二硫化钼（a-CoS/ _MoS2 ）催化剂表现出快速的析氢动力学，起始电位为-147 mV，塔菲尔斜率为每十年126 mV，这比仅使用催化剂要好得多。非晶态硫化钴和二硫化钼层。非晶硫化钴纳米片/多层二硫化钼杂化物的高析氢活性可能是由于析氢活性非晶硫化钴纳米片和层状晶体二硫化钼材料之间独特的电催化协同效应以及大量增加的催化位点。 这项工作为设计和制备具有有效控制催化性能和活性功能表面的新型层状材料提供了一种基于全二维非晶纳米片/二维晶体结构的新通用途径。