Plasma-treated sponge-like NiAu nanoalloy for enhancing electrocatalytic performance in hydrogen evolution reaction

Effect of Ni/Rh ratios on characteristics of NixRhy nanosponges towards high-performance hydrogen evolution reaction

“…To see the morphology of prepared Ni x Rh y nanosponges, the HR-TEM images are exhibited for Ni, Ni 3 Rh 1 , Ni 1 Rh 1 , Ni 1 Rh 3 , and Rh nanosponges as seen in Fig. 1 , which is consistent with the previous reports [2] , [3] , [4] . The TEM images imply that all Ni x Rh y nanosponges are composed of fused nanoparticles with diameter from 10 to 20 nm.…”

“…2 (a’‘-a’’‘)-(e’‘-e’’‘), it can be clearly observed that there are nanoparticles covered with a thin amorphous layer in the samples possessed the higher content of Ni (Ni, Ni 3 Rh 1 , and Ni 1 Rh 1 samples). These thin amorphous layers may block the active sites, therefore, reducing the HER performance of the catalyst [1] , [4] . In order to further understand the effect of Ni/Rh ratios on the characteristics of Ni 3 Rh 1 , Ni 1 Rh 1 , Ni 1 Rh 3 , and Rh samples (except for Ni sample that possessed an amorphous structure), we measured the d-spacings for all these samples by two different methods.…”

“…As a result, Ni and Rh can be seen in appearance and distribution uniformly in the sample. On the other hand, the XRD and XPS results are performed to confirm the Ni/Rh alloying together [1] , [4] , [5] . The full XPS spectra of all samples of Ni, Ni 3 Rh 1 , Ni 1 Rh 1 , Ni 1 Rh 3 , and Rh samples are given as seen in Fig.…”

Data on a highly stable electrocatalyst of NiCoPt/Graphene-dot nanosponge for efficient hydrogen evolution reaction

“…The Tafel slope of Ni 48 Co 48 Pt 4 /G-dot is 33.90 (mV/dec), which is smaller than the slope of 37.62 mV/dec recorded for Ni 48 Co 48 Pt 4 nanoalloy. This data suggests that the electrochemical recombination step is the rate-determining step and the reaction follows the Volmer-Tafel mechanism [3] , [4] , [5] . The ECSA of Ni 48 Co 48 Pt 4 /G-dot is 57.51 cm 2 , which is larger than that of 45.71 cm 2 of Ni 48 Co 48 Pt 4 nanoalloy.…”

Hollow Ru Nanoparticles for Electrocatalytic Hydrogen Evolution

“…Pt is generally considered as the state-of-the-art electrocatalysts toward the hydrogen evolution reaction (HER) to date because of the appropriate strength of the Pt–H bond; however, the high cost and scarcity of Pt are unable to guarantee a sustainable hydrogen supply. Although numerous Pt-free HER electrocatalysts, such as metal phosphides, metal chalcogenides, metal carbides, and metal nanoalloys, have been fabricated to reduce the cost of the catalyst, the HER performance of such catalysts still has a certain gap with Pt. Among the various catalysts, the price of Ru is only 4% of that of Pt and is often applied in the industrial reactions of benzene hydrogenation and CO 2 methanation. , Theoretical studies showed that Ru is a promising alternative to Pt for HER since the energy of the Ru–H bond approaches that of the Pt–H bond .…”