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A direct H2O2 production based on hollow porous carbon sphere-sulfur nanocrystal composites by confinement effect as oxygen reduction electrocatalysts

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Nano Research 2019年第10期12卷 2614-2622页

作者： Guanyu Chen Jiwei Liu Qingqing Li Pengfei Guan Xuefeng Yu linshen xing Jie Zhang Renchao Che Laboratory of Advanced Materials Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials(iChem)Fudan UniversityShanghai 200438China Beijing Computational Science Research Center Beijing 100193China Innovative Center for Advanced Materials(ICAM) Hangzhou Dianzi UniversityHangzhou 310012China

Carbon-sulfur composites have draw n in creasing interest in various fields including electrocatalysis because of their unique ***,carb on-sulfur composite with tiny sulfur nano crystals has still received little ***,hollow porous carb on sphere-sulfur composite(HPCS-S)which possesses excellent electrochemical performance towards H2O2 has been prepared for the first time via a simple silica template *** 2-5 nm sulfur nan ocrystals being restricted in the cha nnel of the hollow porous carb on spheres are un der a strong compressive stress,which was further con firmed by high-resoluti on tran smissi on electr on microscopy(HRTEM)and *** HPCS-S nano crystals show better con ductivity tha n amorphous sulfur clusters because of the reducti on of the steric hindrance which efficie ntly promotes the electron ***,the higher activity and selectivity towards the 2e^oxygen reduction reaction(ORR)to H2O2 in alkaline solution was *** H2O2 selectivity rises from 20%to over 70%after the sulfur addition and the H2O2 production rate achieves 183.99 mmol-gcataiyst-1 with the Faradaic efficiency of 70%.Furthermore,performance enhancement mechanism was also investigated using the den sity functional theory(DFT)calculatio *** the in troduci ng of sulfur nano crystals,the appeara nee of S-S bond greatly decreases the overpotential compared with S-doping,which results in significant enhancement of the electrocatalytic ***,the HPCS-S can be an efficient H2O2 production electrocatalyst in alkaline solution.

关键词： sulfur nanocrystal hydrogen peroxide production carbon sphere oxygen reduction reaction

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Hierarchical coupling effect in hollow Ni/NiFe2O4-CNTs microsphere via spray-drying for enhanced oxygen evolution electrocatalysis

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Nano Research 2020年第2期13卷 437-446页

作者： Xuefeng Yu Guanyu Chen Yizhe Wang Jiwei Liu Ke Pei Yunhao Zhao Wenbin You Lei Wang Jie Zhang linshen xing Jingjun Ding Guangzhou Ding Min Wang Renchao Che Laboratory of Advanced Materials Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials(iChem)Fudan UniversityShanghai 200438China Materials Genome Institute International Centre of Quantum and Molecular Structuresand Physics DepartmentShanghai UniversityShanghai 200444China College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou 310012China

Design and fabrication of cost-effective transition metal and their oxides-based nanocomposites are of paramount significance for metal-air batteries and ***,the traditional optimized designs for nanostructure are complicated,low-efficient and underperform for wide-scale ***,a novel hierarchical framework of hollow Ni/NiFe2O4-CNTs compositemicrosphere forcibly-assembled by zero-dimensional(OD)Ni/NiFo204 nanoparticle(<16 nm)and one-dimensional(1D)self-supporting CNTs was fabricated *** from the unique nanostructure,such monohybrids can achieve remarkable oxygen evolution reaction(OER)performance in alkaline media with a low overpotential and superior durability,which exceeds most of the commercial catalysts based on IrO/RuO2 or other non-noble metal *** enhanced OER performance of Ni/NiFe2OA-CNTs composite is mainly ascribed to the increased catalytic activity and the optimized conductivity induced by the effects of strong hierarchical coupling and charge transfers between CNTs and Ni/NiFe204 *** effects are greatly boosted by the polarized heterojunction interfaces confirmed by electron *** density functional theory(DFT)calculation indicates the epitaxial Ni further enriches the intrinsic electrons contents of NiFe204 and thus accelerates absorption/desorption kinetics of OER *** work hereby paves a facile route to construct the hollow composite microsphere with excellent OER electrocatalytic activity based on non-noble metal oxide/CNTs.

关键词： spray-drying novel structure oxygen evolution reaction(OER) electron holography composite microsphere

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