【摘 要】
：
Constructing efficient carbon material with enhanced mass transfer ability from vacuum residuum (VR) is of prime industrial and scientific significance.Herein,we demonstrated a one-pot synthesis of metal-free and highly symmetric hollow carbon cubes (HCCs
【机 构】
：
State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Qingdao 266580,China;Depa
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Constructing efficient carbon material with enhanced mass transfer ability from vacuum residuum (VR) is of prime industrial and scientific significance.Herein,we demonstrated a one-pot synthesis of metal-free and highly symmetric hollow carbon cubes (HCCs) using cost-efficient vacuum residuum (VR) as a C/N/S source.By multi-techniques such as TEM,SEM,Raman,XPS,and XRD,it is found that the CrAB surfactant plays an important role in emulsifying and forming oil-in-water suspension particles.Subsequently,high aromatics contents in VR favor the formation of HCCs shell by graphitization on the surface of NaCl tem-plate.Notably,heavy metals (e.g.,V,Ni) are not enriched in carbon skeleton due to the unique graphiti-zation mechanism.This metal-free HCCs catalyst showed good catalytic stability and high selectivity towards direct and local electrochemical production of hydrogen peroxide (H2O2) through two-electron O2 reduction due to enhanced mass transfer ability.The results provide a novel avenue to synthesize metal-free cubic carbon material from low-cost and plentiful VR,which are essential to the design of more efficient catalysts for O2 reduction to H2O2.
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