催化作用
材料科学
吸附
Atom(片上系统)
选择性
金属
密度泛函理论
电解质
结合能
活动中心
过渡金属
碳纤维
无机化学
化学工程
纳米技术
物理化学
计算化学
化学
电极
冶金
原子物理学
有机化学
嵌入式系统
复合材料
工程类
物理
复合数
计算机科学
作者
Yahui Wang,Yueshuai Wang,Yonggao Yan,Lina Yan,Xing Cheng,Lirong Zheng,Yue Lu,Ge Chen
标识
DOI:10.1016/j.mtener.2023.101459
摘要
Electrocatalytic oxygen reduction reaction (ORR) for H2O2 production presents an alternative approach suitable for on-site applications. Although atomically dispersed earth-abundant metal species anchored in a nitrogen-doped carbon framework (M–N–C) have demonstrated significant 2e− ORR activity, the Ni–N–C catalyst exhibits unfavorable catalytic activity. It is well-recognized that the d-band center of the metal can be tailored by introducing transition metals, thereby altering the adsorption free energy of the OOH∗ reactive species. Herein, we have designed a dual-single-atom configuration (Ni–ZnNC), where the Zn atom serves as a modulator to adjust the d-band electronic energy of the Ni center, ultimately optimizing the intermediate adsorption and resulting in high 2e− ORR performance. The Ni–ZnNC catalyst demonstrates an H2O2 production rate of 5.6 mol/g/h at 0.0 VRHE with a notable H2O2 selectivity of approximately 60% in an acid electrolyte. Density-functional theory calculations reveal that the Zn atom effectively alters the d-band electronic energy of the Ni center, strengthening the Ni–OOH∗ binding affinity and thereby enhancing the adsorption process. This work provides valuable insights into the design of earth-abundant metal Ni-based electrocatalysts for H2O2 generation.
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