No abstract

In this study, three-dimensional (3D) hierarchical porous carbon with abundant functional groups is produced through a very simple low-cost carbonization of Artemia cyst shells. The unique hierarchical porous structure of this material, combining large numbers of micropores and macropores, as well as reasonable amount of mesopores, is proven favorable to capacitive behavior. The abundant oxygen functional groups from the natural carbon precursor contribute stable pseudocapacitance. As-prepared sample exhibits high specific capacitance (369 F g(-1) in 1 M H2SO4 and 349 F g(-1) in 6 M KOH), excellent cycling stability with capacitance retention of 100% over 10 000 cycles, and promising rate performance. This work not only describes a simple way to produce high-performance carbon electrode materials for practical application, but also inspires an idea for future structure design of porous carbon.

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Electroreduction of CO 2 to multi-carbon products has attracted considerable attention as it provides an avenue to high-density renewable energy storage.However,the selectivity and stability under high current densities are rarely reported. Herein, B-doped Cu (B-Cu) and B-Cu-Zn gas diffusion electrodes (GDE) were developed for highly selective and stable CO 2 conversion to C 2+ products at industrially relevant current densities.T he B-Cu GDE exhibited ah igh Faradaic efficiency of 79 %f or C 2+ products formation at ac urrent density of À200 mA cm À2 and apotential of À0.45 Vvs. RHE. The long-term stability for C 2+ formation was substantially improved by incorporating an optimal amount of Zn. Operando Raman spectra confirm the retained Cu + species under CO 2 reduction conditions and the lower overpotential for *OCO formation upon incorporation of Zn, whichlead to the excellent conversion of CO 2 to C 2+ products on B-Cu-Zn GDEs.