电催化剂
过电位
析氧
插层(化学)
碳纳米管
材料科学
化学工程
层状双氢氧化物
催化作用
复合数
异质结
电子传输链
纳米技术
化学
无机化学
电极
电化学
复合材料
物理化学
有机化学
光电子学
工程类
生物化学
作者
Mengting Duan,Mingjun Qiu,Shangqing Sun,Xingmei Guo,Yuanjun Liu,Xiangjun Zheng,Fu Cao,Qinghong Kong,Junhao Zhang
标识
DOI:10.1016/j.clay.2021.106360
摘要
Layered double hydroxides (LDH) possess high intrinsic catalytic activity for oxygen evolution reaction (OER); however, the low electronic conductivity hinders their further development as high-performance electrocatalysts. To address this problem, NiFe LDH is synthesized and exfoliated into positively charged nanosheets, followed by assembling with negatively charged carbon nanotubes (CNTs). Under the effect of electrostatic interaction, NiFe LDH and CNTs layers are alternately stacked to form an intercalating heterostructure of NiFe LDH/CNTs. This unique configuration provides both sufficient active sites and efficient charge/electron transport channels for OER electrocatalysis. By tuning the relative amounts of NiFe LDH and CNTs, the optimized composite only needs a low overpotential of 234 mV (vs. RHE) to reach a current density of 10 mA cm−2, showing better OER activity than that of RuO2. The excellent performance should be attributed to the synergy between active NiFe LDH and conductive CNTs, as well as the intercalated structure with high accessible surface area.
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