A new electroplated Ir/Ir(OH)<i><sub>x</sub></i> pH electrode and its application in the coastal areas of Newport Harbor, California

ZHANG Xiao; YE Ying; KAN Yating; HUANG Yuanfeng; JIA Jianjun; ZHAO Yue; CHEN Chen-Tung Arthur; QIN Huawei

doi:10.1007/s13131-017-1064-5

一种新型电镀法制备的Ir/Ir(OH)_x pH电极及其在加州纽波特港海域的应用研究

doi: 10.1007/s13131-017-1064-5

1.
浙江大学海洋学院, 舟山, 316021
2.
浙江大学海洋学院, 舟山, 316021;台湾中山大学海洋科学系, 高雄, 80204
3.
杭州电子科技大学机械工程学院, 杭州, 310018

基金项目: The Key Laboratory Project of State Oceanic Administration for Marine Ecosystem and Biogeochemistry of China under contract No. 529101-X21601; the Foundation from Wendy Schmidt Ocean Health XPRIZE and the Southern California Coastal Water Research Project.

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- 收稿日期: 2016-03-07

A new electroplated Ir/Ir(OH)_x pH electrode and its application in the coastal areas of Newport Harbor, California

1.
Ocean College, Zhejiang University, Zhoushan 316000, China
2.
Ocean College, Zhejiang University, Zhoushan 316000, China;Institute of Marine Geology and Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, China
3.
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China

摘要

摘要: 大气中CO₂含量逐年上升，海洋酸化已经成为一个世界性难题。它对生态环境及人类的发展都产生着不可忽视的影响。因此，我们需要一个高精度传感器来监测海水pH值。本研究中传感器使用Ir/Ir（OH）_x电极，制备时以直径为0.25mm的铱丝为基材，在室温条件下通过电化学法在其上原位合成Ir（OH）_x膜。SEM图像显示铱丝表面包覆有纳米级颗粒的膜。该电极具有良好的能斯特斜率，并具有响应快速、稳定性与重现性好、寿命长的优点。将四支该方法制备的pH电极与一支参比电极集成于自制化学传感器，在加州纽波特港进行海试作业。结果显示，该传感器测得海水pH值与Sea-Bird 911 plus CTD测得数据十分接近，且在传感器下投和上拉过程中，数据吻合度更高。因此，自制海洋酸化传感器具有更高的精度和准确度。
- Ir/Ir(OH)_x电极 /
- pH值 /
- 电镀 /
- 加州纽波特港
Abstract: Resulting from the rising levels of atmospheric carbon, ocean acidification has become a global problem. It has significant impacts on the development, survival, growth and physiology of marine organisms. Therefore, a high-precision sensor is urgently needed to measure the pH of sea-water. Iridium wire with a diameter of 0.25 mm is used as the substrate, and an Ir/Ir(OH)_x pH electrode is prepared by a one-step electrochemical method in a LiOH solution at the room temperature. A scanning electron microscope (SEM) observation reveals that it is coated with nanoscale particles. In laboratory tests, the electrode exhibits a very promising pH response, with an ideal Nernst slope (56.14-59.52), fast response, good stability and long life-span in tested pH buffer solutions. For a sea trial, four pH electrodes and one Ag/AgCl reference electrode are integrated with a self-made chemical sensor, and a profile detection of nearly 70 m is implemented near Newport Harbor, California on August 3, 2015. The results reflect that the pH value measured by the sensor is very close to the data given by Sea-Bird 911 plus CTD, with a difference value ranging from 0.000 075 to 0.064 719. And the sensor shows a better data matching degree in 0-40 m water depth. In addition, the high precision and accuracy of the sensor make it possible to use in the ocean observation field.
- Ir/Ir(OH)(OH)_x electrode /
- pH value /
- electroplating /
- Newport Harbor

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参考文献(36)

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一种新型电镀法制备的Ir/Ir(OH)x pH电极及其在加州纽波特港海域的应用研究

doi: 10.1007/s13131-017-1064-5

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出版历程

A new electroplated Ir/Ir(OH)x pH electrode and its application in the coastal areas of Newport Harbor, California

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一种新型电镀法制备的Ir/Ir(OH)_x pH电极及其在加州纽波特港海域的应用研究

A new electroplated Ir/Ir(OH)_x pH electrode and its application in the coastal areas of Newport Harbor, California