NiRh nanosponges with highly efficient electrocatalytic performance for hydrogen evolution reaction

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

“…In which, the lowest value of an overpotential at a current density of 10 mA cm −2 is only 48 mV compared to Ni, Ni 3 Rh 1 , Ni 1 Rh 1 , and Rh samples (403, 75, 64, and 120 mV; respectively) [1] . To further understand the distribution of elements in Ni 1 Rh 3 nanosponge, we tested the element mapping for this sample with the EDS analysis as seen in the article [1] . As a result, Ni and Rh can be seen in appearance and distribution uniformly in the sample.…”

“…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.…”

“…According to these results, we realize that the sample of Ni 1 Rh 3 nanosponge exhibits a higher degree of crystallinity and the lowest average crystalline size (2.880 nm) compared to the other samples. It can be used to explain why the highly HER performance in 0.5 M H 2 SO 4 electrolyte for Ni 1 Rh 3 sample compared to the other sample as seen in the article [1] . In which, the lowest value of an overpotential at a current density of 10 mA cm −2 is only 48 mV compared to Ni, Ni 3 Rh 1 , Ni 1 Rh 1 , and Rh samples (403, 75, 64, and 120 mV; respectively) [1] .…”

“…It can be used to explain why the highly HER performance in 0.5 M H 2 SO 4 electrolyte for Ni 1 Rh 3 sample compared to the other sample as seen in the article [1] . In which, the lowest value of an overpotential at a current density of 10 mA cm −2 is only 48 mV compared to Ni, Ni 3 Rh 1 , Ni 1 Rh 1 , and Rh samples (403, 75, 64, and 120 mV; respectively) [1] . To further understand the distribution of elements in Ni 1 Rh 3 nanosponge, we tested the element mapping for this sample with the EDS analysis as seen in the article [1] .…”

“… Data source location Chungnam National University, Daejeon, South Korea Data accessibility Data is provided with this article Related research article Ngoc-Anh Nguyen, Van-Toan Nguyen, Sangho Shin, Ho-Suk Choi, “NiRh Nanosponges with Highly Efficient Electrocatalytic Performance for Hydrogen Evolution Reaction”, Journal of Alloys and Compounds, 789 ( 2019 ) 163–173. [1] …”