摘要
本工作通过微波水热法制备了系列Ni-Co双金属氧化物材料,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)和电子顺磁共振谱(EPR)等表征手段分析了材料的物相结构、形貌特征、元素价态及缺陷等,并揭示了Ni-Co双金属协同作用对氧空位(Ov)形成的调控机制。研究结果表明,当Ni与Co物质的量的比为1∶3时,所得产物NiCo_(3)O_(x)表现出最优OER性能,在50 mA/cm^(2)电流密度时过电位仅为393 mV,同时具备较低的Tafel斜率(172.3 mV/dec)和超过24 h的催化稳定性,这归因于其Co^(2+)/Co^(3+)与Ni^(2+)/Ni^(3+)氧化还原的协同作用并用原位拉曼验证了中间体*OOH吸附促进反应活性及Ov介导的电子快速转移机制,并通过DFT计算证明了双金属界面处的电子耦合效应增强了材料导电性。该研究为设计基于氧空位调控的高效OER催化剂提供了新策略。
A series of Ni-Co bimetallic oxides were synthesized via a microwave-assisted hydrothermal method.The phase structure,morphological features,valence states,and defects of the materials were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and electron paramagnetic resonance(EPR).The results reveal the regulatory mechanism of Ni-Co bimetallic synergy on the formation of oxygen vacancies(Ov).When the molar ratio of Ni to Co was 1∶3,the obtained NiCo_(3)O_(x) exhibited the best OER performance,delivering an overpotential of only 393 mV at a current density of 50 mA/cm^(2),along with a low Tafel slope(172.3 mV/dec)and catalytic stability exceeding 24 h.This superior activity is attributed to the synergistic redox interplay between Co^(2+)/Co^(3+)and Ni^(2+)/Ni^(3+),as further verified by in situ Raman spectroscopy,which confirmed that*OOH intermediate adsorption promoted reaction kinetics and that Ov mediated rapid electron transfer.Density functional theory(DFT)calculations further demonstrated that electronic coupling at the bimetallic interface enhanced the material’s conductivity.This study provides a new strategy for designing efficient OER catalysts based on oxygen-vacancy regulation.
作者
孟楚楚
王亚男
张丹
李君华
MENG Chuchu;WANG Yanan;ZHANG Dan;LI Junhua(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,China;Research Institute of Petrochemical Industry Technology Innovation in Liaoning Province,Shenyang 110170,China)
出处
《燃料化学学报(中英文)》
北大核心
2026年第2期102-113,共12页
Journal of Fuel Chemistry and Technology
基金
辽宁省教育厅高校基本科研项目(LJ212510148034)
辽宁省教育厅化工新材料创新团队项目(LJ222410148052)
抚顺市“抚顺英才计划”项目(FSYC202201001)资助。
关键词
氧析出
电催化
非贵金属催化剂
离子掺杂
oxygen evolution
electrocatalysis
non-noble metal catalysts
ion doping
