In-situ Growth of Ultrathin ZIF-67 Nanosheets on Conductive Ti@TiO2/CdS Substrate for High-efficient Electrochemical Catalysis
In-situ Growth of Ultrathin ZIF-67 Nanosheets on Conductive Ti@TiO2/CdS Substrate for High-efficient Electrochemical Catalysis
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导电 Ti@TiO2/CdS 基底上超薄 ZIF-67 纳米片的原位生长用于高效电化学催化
DOI：
10.1016/j.electacta.2016.10.002
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发表时间：
2016-11
影响因子：
6.6
通讯作者：
Xu Cailing
中科院分区：
文献类型：
--
作者：
Zhang Ting;Du Jing;Zhang Haoli;Xu Cailing
有效的电荷传输是电催化剂设计成功的关键。在这项工作中，我们报告了原位生长的ZIF-67纳米片的导电Ti @ TiO 2/CdS基板上的高效电化学催化由于优化的电荷传输。在Ti@TiO2/CdS纳米线阵列衬底上生长了纳米ZIF-67，得到了独特的三维层次结构，并将其作为析氧反应（OER）和H2 O2氧化的电催化剂进行了研究。纳米线支撑的ZIF-67纳米片电极对OER和H2 O2氧化表现出显着的电催化活性和优异的稳定性，这可以通过电子沿着一维Ti @ TiO 2/CdS纳米线沿着到Ti基底的快速传输、大的电化学活性表面积以及咪唑配体中电负性N原子诱导的Co离子价态上升来解释。与其他MOFs催化剂相比，我们获得了非常小的Tafel斜率（42 mV/dec）和10 mA cm− 2时的小过电位（0.41 V）。当用于H2 O2检测时，该电极给出了1214.3 μAmM−1cm−2的高灵敏度，5 μM-14 mM的宽线性范围和1.11 μM的低检测限。本研究表明，原位生长的Ti@TiO2/CdS/ZIF-67纳米结构在水的氧化和H2 O2的检测方面具有很好的应用前景。
Efficient charge transport is a key to the successful design of electrocatalyst. In this work, we report the in-situ growth of ultrathin MOF material (ZIF-67) nanosheets on conductive Ti@TiO2/CdS substrate for high-efficient electrochemical catalysis due to optimized charge transport. The ultrathin ZIF-67 nanosheets were grown on Ti@TiO2/CdS nanowire array substrates resulting unique 3D hierarchical structures, which were investigated as electrocatalyst for the oxygen-evolution reaction (OER) and H2O2oxidation. The nanowire-supported ZIF-67 nanosheet electrode shows remarkable electrocatalytic activity and excellent stability toward OER and H2O2oxidation, which can be explained by the rapid electron transport along the 1D Ti@TiO2/CdS nanowire to Ti substrates, large electrochemical active surface area and the rising valence state of Co ions induced by electronegative N atom in imidazole ligands. Compared with other MOFs catalysts, we obtained a very small Tafel slope (42 mV/dec) and a small overpotential (0.41 V) at 10 mA cm−2for OER. When used for H2O2detection, the electrode gave a high sensitivity of 1214.3 μAmM−1cm−2, a wide linear range of 5 μM–14 mM and a low detection limit of 1.11 μM. This research suggests that the in-situ grown nanostructure of Ti@TiO2/CdS/ZIF-67 hold great promise for advanced electrocatalytic electrode in water oxidation and H2O2detection.
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