An Unusually High Sensitivity of Pt-black pH Electrode |
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| Authors: | SUN Yonghong XIANG Wenhua K L Cheng |
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| Affiliation: | SUN Yonghong1,XIANG Wenhua2,K L Cheng3 (1. School of Environmental , Chemical Engineering,Dalian Jiaotong University,Dalian 116028,China,2. School of Life Science & Technology,Central South University of Forestry , Technology,Changsha 410004,3. University of Missouri-Kansas City,Kansas MO64110,USA) |
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| Abstract: | The potentials of Pt-black electrode using a copper conducting wire instead of the salt bridge in acid and alkaline solutions without the use of H2 evolution reactions were measured. There were three nonlinear portions in the calibration curve. Unusually, the potential slopes at pH 3-5 and 8-10 indicated 200 mV and 70 mV per pH, respectively. Such high sensitivity for pH slope, more than 4 times of usual 59 mV per pH, may be credited to the special properties of the Pt-black surface. SEM (scanning electroni... |
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| Keywords: | Pt-black pH electrode sensitivity capacitance potential |
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