分解水
化学
异质结
电催化剂
中心(范畴论)
D波段
纳米技术
催化作用
光电子学
电化学
结晶学
物理化学
材料科学
光催化
电极
光学
物理
生物化学
拉曼光谱
作者
Xue‐Zhi Song,Tao Zhang,Yu-Hang Zhao,Jing-Chang Ni,Yu Pan,Zhenquan Tan,Xiao-Feng Wang
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2023-05-18
卷期号:62 (21): 8347-8356
被引量:2
标识
DOI:10.1021/acs.inorgchem.3c00876
摘要
Accomplishing a green hydrogen economy in reality through water spitting ultimately relies upon earth-abundant efficient electrocatalysts that can simultaneously accelerate the oxygen and hydrogen evolution reactions (OER and HER). The perspective of electronic structure modulation via interface engineering is of great significance to optimize electrocatalytic output but remains a tremendous challenge. Herein, an efficient tactic has been explored to prepare nanosheet-assembly tumbleweed-like CoFeCe-containing precursors with time-/energy-saving and easy-operating features. Subsequently, the final metal phosphide materials containing multiple interfaces, denoted CoP/FeP/CeOx, have been synthesized via the phosphorization process. Through the optimization of the Co/Fe ratio and the content of the rare-earth Ce element, the electrocatalytic activity has been regulated. As a result, bifunctional Co3Fe/Ce0.025 reaches the top of the volcano for both OER and HER simultaneously, with the smallest overpotentials of 285 mV (OER) and 178 mV (HER) at 10 mA cm-2 current density in an alkaline environment. Multicomponent heterostructure interface engineering would lead to more exposed active sites, feasible charge transport, and strong interfacial electronic interaction. More importantly, the appropriate Co/Fe ratio and Ce content can synergistically tailor the d-band center with a downshift to enhance the per-site intrinsic activity. This work would provide valuable insights to regulate the electronic structure of superior electrocatalysts toward water splitting by constructing rare-earth compounds containing multiple heterointerfaces.
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