Abstract
Carbon nanomaterials are potential materials with their intrinsic structure and property in energy conversion and storage. As the electrocatalysts, graphene is more remarkable in electrochemical reactions. Additionally, heteroatoms doping with metal-free materials can obtain unique structure and demonstrate excellent electrocatalytic performance. In this work, we proposed a facile method to prepare bifunctional electrocatalyst which was constructed by nitrogen, sulfur doped graphene (NSG), which demonstrate superior properties with high activity and excellent durability compared with Pt/C and IrO2 for oxygen reduction (OR) and oxygen evolution (OE) reactions. Accordingly, these phenomena are closely related to the synergistic effect of doping with nitrogen and sulfur by rationally regulating the polarity of carbon in graphene. The current work expands the method towards carbon materials with heteroatom dopants for commercialization in energy-related reactions.
Highlights
Graphene, a two-dimensional atom-thick conjugated structure, has drawn particular attention for its good conductivity, mechanical property, electrochemical stability and huge specific surface area as well as its wide potential applications in catalysts [1,2]
To address this problem, seeking alternative Oxygen reduction reaction (ORR) and OER electrocatalysts with low overpotentials and cost is urgent for sustainable energy solutions
Electrocatalytic Properties of Catalysts In O2 -saturated 0.1 M KOH electrolyte, a usual three-electrode electrochemical device consisted of Ag/AgCl, Pt wire and rotating ring-disk electrode (4 mm diameter) which was orderly used as a reference electrode, counter electrode and working electrode with the continuous flowing of O2 operated to test the ORR performances of different catalysts which was revealed by linear sweep voltammetry (LSV) [34]
Summary
A two-dimensional atom-thick conjugated structure, has drawn particular attention for its good conductivity, mechanical property, electrochemical stability and huge specific surface area as well as its wide potential applications in catalysts [1,2]. The platinum (Pt), with the advantage of low overpotential and high current density, has been served as the most promising ORR electrocatalyst regardless of the scarcity, high cost, and poor durability which obstruct its application in the energy field [7,19,20,21,22]. Heteroatom doped carbon-based materials as promising metal-free electrocatalysts have encouraged intensive research, while it is found that, the hybrids of doped graphene show multi-functions, and have a wide application. Low cost of and high electrocatalytic efficiency have a wide application prospect in energy storage and conversion and environmental detection. Developing low cost and and highpotassium as bifunctional materialselectrocatalysts for ORR/OER synthesis of graphene oxide electrocatalytic efficiency metal-free materials has become a focus of study. We developed an efficient method to prepare heteroatom nitrogen-, sulfur-doped as bifunctional materials for ORR/OER by hydrothermal synthesis of graphene oxide and. Resultsgraphene and Discussion potassium thiocyanate (KSCN), whether the guest gas (NH3) exists or not
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