材料科学
电催化剂
石墨烯
纳米孔
氧化物
镍
纳米复合材料
硫化镍
析氧
双功能
化学工程
无机化学
金属有机骨架
催化作用
分解水
纳米技术
电化学
冶金
电极
有机化学
吸附
化学
物理化学
工程类
光催化
作者
Kolleboyina Jayaramulu,Justus Masa,Ondřej Tomanec,Daniel Peeters,Václav Ranc,Andreas Schneemann,Radek Zbořil,Wolfgang Schuhmann,Roland A. Fischer
标识
DOI:10.1002/adfm.201700451
摘要
Engineering of controlled hybrid nanocomposites creates one of the most exciting applications in the fields of energy materials and environmental science. The rational design and in situ synthesis of hierarchical porous nanocomposite sheets of nitrogen‐doped graphene oxide (NGO) and nickel sulfide (Ni 7 S 6 ) derived from a hybrid of a well‐known nickel‐based metal‐organic framework (NiMOF‐74) using thiourea as a sulfur source are reported here. The nanoporous NGO/MOF composite is prepared through a solvothermal process in which Ni(II) metal centers of the MOF structure are chelated with nitrogen and oxygen functional groups of NGO. NGO/Ni 7 S 6 exhibits bifunctional activity, capable of catalyzing both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) with excellent stability in alkaline electrolytes, due to its high surface area, high pore volume, and tailored reaction interface enabling the availability of active nickel sites, mass transport, and gas release. Depending on the nitrogen doping level, the properties of graphene oxide can be tuned toward, e.g., enhanced stability of the composite compared to commonly used RuO 2 under OER conditions. Hence, this work opens the door for the development of effective OER/HER electrocatalysts based on hierarchical porous graphene oxide composites with metal chalcogenides, which may replace expensive commercial catalysts such as RuO 2 and IrO 2 .
科研通智能强力驱动
Strongly Powered by AbleSci AI