Anchored RuSe₂nanospheres on Co–N–C nanosheets boost electrocatalytic alkaline hydrogen evolution

Abstract

Ru-based catalysts are potential substitutes for Pt in the hydrogen evolution reaction (HER). It is worth noting that the Se ions in RuSe2 can modulate the electronic structure of Ru...

RuSe2–CoTe Heterogeneous Surfaces Coated with NC Layer for Excellent HER Performance under Alkaline Condition

“…The successful synthesis of CoTe on nickel foam was confirmed . For RuSe 2 /NF, diffraction peaks appear at 30.1, 33.8, 37.1, 43.1, 51.0, 55.8, and 58.1°, respectively, which correspond to the (200), (210), (211), (220), (311), (023), and (321) crystal planes . Notably, the XRD of RuSe 2 –CoTe/NC exhibited all of the diffraction peaks of RuSe 2 and CoTe, which confirmed the successful synthesis of RuSe 2 –CoTe/NC.…”

Spindle Nanorods of CeO2 and NiS Heterointerface Coated by the NC Layer: A High-Performance Bifunctional Electrocatalyst for Water Splitting

“…The C dl value of NC/NiS-CeO 2 is 98.94 mF cm –2 , which is much better than that of Ni-CeO 2 (1.12 mF cm –2 ), NC/NiS (83.61 mF cm –2 ), and NF (0.24 mF cm –2 ). The large C dl value of NC/NiS-CeO 2 indicates the largest ESCA, suggesting that it has the most abundant number of active sites (Figure d). , …”

“…Importantly, NC/NiS-CeO 2 only requires an overpotential of 47 and 108 mV to provide a current density of 10 and 50 mA cm –2 , respectively, which is superior to other electrocatalysts (Figure b). Furthermore, the Tafel slope of the NC/NiS-CeO 2 electrode (86.6 mV dec –1 ) is lower than that of other samples, indicating that the NC/NiS-CeO 2 electrode has better reaction kinetics (Figure c). , The cyclic voltammetry (CV) can estimate the double-layer capacitance ( C dl ) of different samples, and then the electrochemical surface area (ECSA) of the electrocatalyst can be calculated by the C dl . Figure S5 shows the CV curve of the electrode in the nonfaradic region.…”

“…The large C dl value of NC/NiS-CeO 2 indicates the largest ESCA, suggesting that it has the most abundant number of active sites (Figure 5d). 6,50 However, to illustrate the effect of the introduction of CeO 2 and the treatment of thiourea on the specific activity in the catalyst, the ECSA values of NC/NiS-CeO 2 , Ni-CeO 2 , and NC/NiS were calculated, and the LSV curve and Tafel slope after ECSA normalized were compared. In Table S2, the ESCA of NC/NiS-CeO 2 (6.20 m 2 g −1 ) is significantly higher than that of Ni-CeO 2 (0.81 m 2 g −1 ) and NC/NiS (5.88 m 2 g −1 ).…”

Ni nanoparticles assembled on the surface of biomass-derived porous carbon as competitive candidates for the hydrogen evolution reaction

“…13,14 A range of nickel-based catalysts has been widely investigated over the past decades, including oxides, 15,16 hydroxy oxides, 17,18 sulfides, 19,20 nitrides, 21,22 and phosphates,. [23][24][25][26][27][28] For example, Liu et al generated in situ active NiOOH with ultrafine and porous textures, which delivered superior HER performance with an extraordinary 80% electricity-to-hydrogen energy conversion efficiency. 29 Zhou et al exhibited that the crystal strain induced the formation of NiOOH from the Co-Co bond to boost the electrocatalytic activity.…”