Confined N-CoSe2 active sites boost bifunctional oxygen electrocatalysis for rechargeable Zn–air batteries

A NiFe/NiSe2 heterojunction bifunctional catalyst rich in oxygen vacancies introduced using dielectric barrier discharge plasma for liquid and flexible all-solid-state rechargeable Zn–air batteries

“…5 The small peaks of O-C]O are mainly due to the adsorption of O 2 in air on the surface of the material. 12 The high-resolution N 1s spectrum (Fig. 3c) can be adequately deconvoluted into four peaks belonging to pyridinic N (398.8 eV), pyrrolic N (400.1 eV), graphitic N (401.2 eV), and oxidized N (403.2 eV).…”

“…The electrochemically active-surface-area (ECSA) of the synthesized catalysts was estimated according to electrochemical double-layer capacitance (C dl ) on the catalytic surface, and there is a linear correlation between them that a high value of C dl means a high ECSA. 12 We obtained the C dl values from the CV curves in a non-faradaic region illustrated in Fig. S20, † at different scanning rates (20-100 mV s À1 ).…”

“…14 Meanwhile, the strong electronic coupling between the TMS NP core and wrapped carbon shells may reduce the energy barrier of the OER and ORR reactions. 12 Designing surfaces and interfaces by constructing heterostructures is an effective strategy to boost the intrinsic activity of electrocatalysts, since the interface is usually where the catalytic reaction takes place. 9,15 The electronic structure can be optimized by the strong electronic interaction between the different active phases in the heterostructure, thereby promoting the production of highly active substances or regulating the chemical adsorption of reactive intermediates on the catalyst surface.…”

“…11 Although the performance of these catalysts is relatively excellent, TMS NPs tend to aggregate during the preparation and catalysis processes, resulting in low conductivity and poor stability, which will impair their inherent activity and stability, so they cannot simultaneously contribute to the OER/ORR. 12 Recently, Fu et al constructed a hierarchical N-doped carbon framework with NiFe NPs encapsulated inside (Ni 3 Fe@N–C) by an organometallic coordination polymer (OCP) induced strategy, demonstrating that a suitable carbon layer thickness leads to optimal OER activity and stability. 13 In this regard, the TMS NPs wrapped in carbon shells may be a feasible method to improve stability and durability.…”

Dual Redox Active Sites N‐C@Ni2P/NiSe2 Heterostructure Supercapacitor Integrated with Triboelectric Nanogenerator toward Efficient Energy Harvesting and Storage

“…[ 10–12 ] Earth‐abundant transition‐metal selenides have been highlighted owing to their desirable theoretical capacities and strong redox reversibility. [ 13–16 ] Especially, the paramagnetic NiSe features superior electrical conductivity (1 × 10 –3 S m –1 ) resulting from its narrow energy gap, which accelerates electron migration. [ 16,17 ] Meanwhile, the metal‐selenium bond is relatively easy to break due to the larger radius of selenium facilitating the redox reaction kinetics.…”