Carbon nitride decorated nitrogen doped graphene hollow spheres loaded Ni/Co and corresponding oxides nanoparticles as reversible air electrode catalysts for rechargeable zinc-air batteries

NiFe nanoparticles supported on N-doped graphene hollow spheres entangled with self-grown N-doped carbon nanotubes for liquid electrolyte/flexible all-solid-state rechargeable zinc–air batteries

“…Comparing the peaks of sample Ni@NGHS-NCNTs with the pure crystalline metallic Ni phase (JCPDS# 04-0850), the three diffraction peaks situated at 44.5°, 51.8°, and 76.37° should be attributed to metallic Ni. 40,42 A similar result was found from the XRD pattern of sample Fe@NGHS-NCNTs, and the peaks at 44.67°, 65.0°, and 82.3° should belong to metallic Fe. 42,45 Moreover, the d-spacing of 0.1780 nm (Fig.…”

“…1g), which is close to the standard lattice fringes of Ni (0.1762 nm, JCPDS#04-0850) and Fe (0.2026 nm, JCPDS# 06-0696), should correspond to the (200) plane of Ni and the (110) plane of Fe, respectively, indicating the presence of single metal. 40 For sample NiFe 3 @NGHS-NCNTs, the (111) lattice plane of NiFe alloy with d-spacing of $0.2088 nm could be observed clearly (Fig. 1i), which is approximately equal to the standard lattice fringes of NiFe alloy (0.2079 nm, JCPDS#47-1417).…”

“…First, positively charged PSs, which can be obtained by selecting a specific initiator, adsorb the negatively charged GO, owing to the surface oxygen-containing groups, through electrostatic attraction. 40 The subsequently added melamine (MeIM) can also be sandwiched between the carbon layers of the GO. Both the introduced PSs and MeIM adequately prevent the aggregation of GO and promote GO to expose more locations to accept the subsequently introduced 2-MIM.…”

“…Preparation of NiFe 3 @NGHS-NCNTs, Fe@NGHS-NCNTs, Ni@NGHS-NCNTs, NGHS and NiFe 3 @NGHS-NCNTs(thick) First, 4 mmol of 2-methylimidazole (2-MIM) and 1 g of PSs were dispersed in 25 mL of deionized (DI) water to form a suspension. Then, 50 mg of negatively charged GO (prepared by a modied Hummers' method as per our previous report 40 ) was added and vigorously stirred for 12 h. Next, 3 g of melamine (MeIM) was added and continuously stirred for another 12 h. Aer that, 15 mL of 0.125 mM Ni(NO 3 ) 2 and 15 mL of 0.375 mM Fe(NO 3 ) 3 were uniformly mixed and gradually added. Metal ions would be uniformly dispersed by 2-MIM mentioned above through coordination.…”

Electrochemically reconstructed high-entropy amorphous FeCoNiCrVB as a highly active oxygen evolution catalyst

“…3 Nowadays, noble metal oxides, such as RuO 2 and IrO 2 , have been used as benchmark OER catalysts, however, their high cost and poor stability limit large-scale applications. 4 Therefore, researchers have evaluated earth-abundant and promising transition-based-alloys and their phosphides, 5 selenides, 6 carbides, 7 and borides 8 for efficient water splitting. In fact, non-oxide catalysts would experience rapid in situ electrochemical transformation and form real OER active sites in alkaline solution.…”