CoNi-MOF-74/泡沫镍衍生的CoNi@C/NF复合物用于高效有机电合成

CoNi-MOF-74/NF Derived CoNi@C/NF Hybrid for Efficient Electrosynthesis of Organics

电催化有机合成作为一种绿色可持续的合成方法,是替代工业上传统化学品合成的最佳选择,但目前大多以半反应为主.为了实现能源投资效益最大化,两电极同时进行有机物的电转化是行之有效的解决方案.电极材料需要满足两端反应同步高效进行,并总电子转移数保持一致.因此,合成廉价、高效以及高稳定性的多功能电催化剂是十分必要的.此研究中,以泡沫镍(NF)为镍源和模板,通过一步溶剂热法,原位生长CoNi-MOF获得CoNi-MOF-74/NF材料.以CoNi-MOF-74/NF为前驱体,在20%H_(2)/Ar混合气、400℃下煅烧得到NF负载的碳包裹CoNi合金纳米颗粒(CoNi@C/NF).该杂化材料不仅在三电极体系中对苯甲醇氧化成苯甲酸和硝基苯还原制苯胺这些半反应表现出优异的催化性能,对两电极体系即阳极的电氧化苯甲醇和阴极的电还原硝基苯都能实现99%产率.利用有限的催化剂及电量生产更多的高附加值产品,从而创建可持续的有机合成体系,为设计多功能电极材料在精细化学品的绿色合成领域开辟了新的思路.

Electrocatalytic organic synthesis as a green and sustainable synthesis method,has a great potential to replace traditional synthetic method of fine chemicals in industry.To maximize the energy investment,achieving simultaneous con-version of organics at two electrodes is an effective solution.The required electrocatalysts should be effective on two reac-tions at both anode and cathode,and balance the total electron transfer numbers.However,most reported catalysts are mono-functional and high selectivity of target products is difficult to control.Therefore,it is necessary to develop multi-functional electrocatalysts with low-cost,high efficiency and long-life.In this work,CoNi-MOF-74/NF composite was obtained by in-situ growth of bimetallic metal-organic framework(CoNi-MOF)on nickel foam(NF)via one-step solvothermal method.NF provided nickel source and template.Then the CoNi-MOF-74/NF was calcined to give nickel foam stabilized CoNi alloy nanoparticles coated with graphite carbon layer under 20%H_(2)/Ar atmosphere at 400℃.The CoNi@C/NF hybrid shown ex-cellent catalytic performance for the isolated electrooxidation of benzyl alcohol to benzoic acid and the electroreduction of nitrobenzene(NP)to aniline using three-electrode system.Furthermore,the hybrid achieved 99%conversion for the pairing reaction constructed by the electrocatalytic oxidation of alcohol at anode coupling with the electroreduction of nitrobenzene at cathode.Thus,more value-added organic products could be obtained using limited catalyst and electricity,creating a sus-tainable organic synthesis system.Furthermore,the CoNi@C/NF performs good catalytic stability at two electrodes even after six cycles.For comparison,various contrast catalysts including monometallic Ni@C/NF,Co@C,and CoNi@C have been also synthesized.The optimal activity of CoNi@C/NF mainly attributes to the synergistic catalysis between Co and Ni,good electric conductivity of NF and graphitic carbon,as well as the porous porosity from NF and porous carbon framework.This study opens up a novel way for designing multifunctional electrode materials in the green synthesis of fine chemicals from MOFs.