纳米球状Ni5Mo1Sx的制备及其电催化析氧性能研究
Synthesis and electrocatalytic oxygen evolution performance of Ni5Mo1Sx nanospheres
针对镍基硫化物在电解水反应中存在的本征活性及耐久性不足的问题,采用杂原子掺杂策略构建了Mo掺杂硫化镍多级纳米球状复合材料(Ni5Mo1Sx@NF)。实验表明,Mo掺杂可有效调控NiSx的电子结构,通过增强镍活性位点的氧化态及优化关键氧中间体的吸附能,显著提升材料的本征催化活性。电化学测试显示,该催化剂材料在10 mA/cm2电流密度下的析氧反应(OER)过电位低至160 mV,使用该材料组装的阴离子交换膜电解槽(AEMWE)在1.72 V工作电压下即可实现500 mA/cm2电流密度,并保持200 h稳定运行。结合实验表征与理论计算分析,揭示了Mo掺杂诱导的电子结构重构对材料性能增强的关键作用。
To address the intrinsic activity and durability issues of nickel-based sulfides in water electrolysis,this study developed a molybdenum-doped nickel sulfide nanospherical composite (Ni5Mo1Sx@NF) through a heteroatom doping strategy.Experimental results demonstrate that Mo doping effectively regulates the electronic structure of NiSx by enhancing the oxidation state of nickel active sites and optimizing the adsorption energy of key oxygen intermediates,thereby significantly improving the material’s intrinsic catalytic activity.Electrochemical tests reveal that the catalyst exhibits an exceptionally low oxygen evolution reaction (OER) overpotential of 160 mV at 10 mA/cm2.The assembled anion exchange membrane water electrolyzer (AEMWE) achieves a current density of 500 mA/cm2 at a working voltage of 1.72 V and maintains stable operation for 200 hours.Combined experimental characterization and theoretical calculations elucidate the critical role of Mo doping-induced electronic structure reconstruction in enhancing material performance.
析氧反应 / 阴离子交换膜电解槽 / 镍基硫化物 / 杂原子掺杂
oxygen evolution reaction / anion exchange membrane water electrolyzer / nickel-based sulfides / heteroatom doping
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河北省地方科技发展指导基金项目(226Z1005G)
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