![]() ![]() Creating abundant edges is straight-forward but leads to high surface energy and low stability 15, 19, 20. However, only the edge S sites of pure MoS 2 are catalytically active for the HER and the vast amount of S sites in the basal plane are quite inert and not sufficiently utilized 8, 15, 16, 17, 18. Two-dimensional MoS 2, an earth-abundant material with unique structural and chemical properties, has shown attractive catalytic activity for the reaction and is considered as a potential alternative to the precious platinum-based catalysts in acidic medium 6, 7, 8, 9, 10, 11, 12, 13, 14. However, the large-scale implementation of the reaction process is severely limited by scarcity of traditional platinum-based catalysts 4, 5. The electrochemical splitting of water for producing hydrogen via renewable energy supply is a significant, carbon-neutral technology for clean energy generation 1, 2, 3. This strategy provides a viable route for developing MoS 2-based catalysts for industrial HER applications. First-principles calculations demonstrate that inner layer-confined cobalt atoms stimulate neighbouring sulfur atoms while surface-confined selenium atoms stabilize the structure, which cooperatively enable the massive generation of both in-plane and edge active sites with optimized hydrogen adsorption activity. At a large current density of 1000 mA cm −2, a much lower overpotential of 382 mV than that of 671 mV over commercial Pt/C catalyst is achieved and stably maintained for 360 hours without decay. Herein, taking advantage of its tri-layer structure, we report a MoS 2 nanofoam catalyst co-confining selenium in surface and cobalt in inner layer, exhibiting an ultra-high large-current-density HER activity surpassing all previously reported heteroatom-doped MoS 2. MoS 2 as a low-cost candidate suffers from low catalytic performance. Those two, combined with good comp, intermediate gas barrel and the LMOS, could make for a flat shooting rifle.The lack of highly efficient, inexpensive catalysts severely hinders large-scale application of electrochemical hydrogen evolution reaction (HER) for producing hydrogen. You didn't even mention adjustable gas block (SLR Sentry is my pref) and buffer system (Taccom lightweight or JP SCS). Timney Comp or Calvin Elite come to mind.Ĭomp: If you're going all-out, get the best functional comp. Trigger: There are better triggers than Hiperfire on the market for a 223 AR, though they are pretty bulletproof. Or with the money you're saving not buying Cobalt, go with a Swaro z8i. Scope: At that price point, HD Razor 2e 1-8 or new 1-10. There are more functional stocks on the market. ![]() Stock/Buffer: I'm assuming this is just for looks. I'd look at 2A Arms latest forged lightweight receiver set. If you're just going for looks, sure, but there are better options. Their speedhole receivers are heavier than a normal forged set. Rainier has an Ultramatch 16" intermediate gas fluted barrel that is 1/3 the price of Proof, $100 less than a Stretch16, and looks like the hot ticket right now.į1: Ugh. The LMOS will last forever, and the difference is minimal.īarrel: Proof is nice, but sometimes the extra weight of a "normal" barrel is better for control. The ULMOS is aluminum, and is a short lifetime part, even according to JP. Please be mindful of reddit's few rules and practice good reddiquette. ![]()
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