Zhuoyuan Yang,Yuqing Miao,Tianrui Wang,Xiaocai Liang,Mingshu Xiao,Weiwei Li,Yang Yang
The Ni ultrathin layer was obtained by the simple self-adsorption of Ni2+ on the surface of glassy carbon electrode. Through a consecutive potential scan in alkali solution, the adsorbed Ni2+ was transformed to the ultrathin layer of Ni(OH)2/NiOOH which exhibits good electrocatalysis toward the oxidation of glucose. Only a little of Ni2+ was consumed to obtain such an ultrathin layer of Ni with excellent electrochemical performance. Due to the low diffusion hindrance and the good electrocatalytic property of Ni(OH)2/NiOOH ultrathin structure, the electrode response toward glucose reaches a steady-state level within only 4 s, demonstrating a rapid and sensitive response. The calibration plot is linear over the wide concentration range of 0∼7 mM with a slope of 1.01 μA/mM (sensitivity) and a correlation coefficient of 0.9996. The detection limit of the electrode was found to be 10.9 μM at a signal-to-noise ratio of 3. The adsorption method is very simple and the ultrathin layer of Ni was formed in a controllable manner with the size lower than nanoscale, which will find the potential applications in nanofabrication for the nanodevices of fuel cell or electrochemical sensor in the future.
Ouyang Lei,Miao Yuqing,Xu Lina,Xiao Mingshu,Liang Xiaocai,Li Weiwei,Yang Yang
Molecular self-assembly is an important aspect of bottom-up approaches for the nanofabrication of functional materials. The self-assembly of smaller-size units like ions has yet to be studied further. The self-adsorption of Bi III without applied potential and electrochemical deposition of Bi/Bi III were studied and compared through cyclic voltammetry. Both of them exhibit two pairs of redox peaks assigned to the (2 × 2)-Bi adlayer and incommensurate ( p × √3)-2 Bi adlayer. The adsorption of two Bi surface phases is related with the Bi salt concentration and adsorption time. Within a certain concentration or time range, the adsorption approaches to be saturated due to the surface limitation of self-adsorbed surface layers. The (2 × 2)-Bi adlayer firstly adsorbs to the active sites of Au where there is strong interaction between Bi and Au. With the increase of time, more Bi adsorbs onto the unoccupied sites of Au with a relatively weak interaction force to form a denser ( p × √3)-2 Bi layer. A new pair of redox peaks appears for the electrodeposition of the Bi/Bi III bulky layer which is easily stripped from the Au surface through a consecutive potential scan. Comparatively speaking, the adsorbed (2 × 2) and ( p × √3)-2 Bi adlayers are stable in the same potential scanning condition due to the strong interaction between the two surface Bi layers and the below Au atoms. Such a controllable self-adsorption of the Bi III ultrathin layer on foreign substrates exhibits a potential for the modification of materials in the size of ions.
Developing high-performance, ultra-thin membranes for alkaline water electrolysis (AWE) remains challenging due to organic-inorganic phase separation under harsh conditions. Here, an ultrathin (≈120 µm) polyether sulfone/zirconia (PES/ZrO 2 ) composite membrane is designed via interfacial engineering using a titanate coupling agent (CHOPT). The modified ZrO 2 exhibits opposite Zeta potential to PES, enabling electrostatic self-adsorption that strengthens with alkalinity, ensuring durable nanoparticle anchoring. Incorporating a PPS mesh further enhances mechanical stability. The optimized membrane achieves exceptional performance: ultra-low area resistance (0.09 Ω cm 2 ), high bubble point pressure (4.55 bar), and excellent hydrophilicity. In 30 wt% KOH at 80 °C, the membrane enables electrolyzer operation at 1.82–1.88 V (1.0 A cm −2 ) with 150-hour stability. Additionally, theoretical calculations and molecular dynamics simulations provide insights into the mechanisms behind the membrane's outstanding performance. This work provides a scalable strategy for durable, high-efficiency AWE membranes, addressing critical challenges in green hydrogen production.
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