烧结温度对Ti/TiN_(x)/Mn_(2)O_(3)阳极涂层性能的影响

Effect of sintering temperature on coating properties of Ti/TiN_(x)/Mn_(2)O_(3) anode

采用热分解工艺在Ti/TiN_(x)表面制备了Mn2O3催化层,研究了制备过程中烧结温度对Ti/TiN_(x)/Mn2O3阳极材料析氧电催化性能的影响。通过SEM、XRD、Raman、XPS等表征方法对Mn2O3催化层的表面微观形貌和晶体结构进行分析;通过Tafel、LSV、恒流极化、EIS、ECSA等电化学测试手段对阳极材料的耐腐蚀性能、析氧催化活性进行分析。结果表明:烧结温度对Ti/TiN_(x)/Mn2O3阳极材料的表面微观结构、Mn的价态、耐电化学腐蚀性能以及电催化性能具有较大的影响。当烧结温度为200℃时,阳极材料表面的Mn2O3催化层致密平整且结晶性最好。随着烧结温度的升高,Mn2O3催化层产生较多的裂纹,同时氧空位的含量逐渐减少,Mn(Ⅳ)逐渐增多,参与电化学反应的电极表面的活性位点数量大幅降低,抑制了析氧动力学。

The Mn_(2)O_(3)catalytic layer was prepared on the surface of Ti/TiN_(x)by thermal decomposition process,and the effect of sintering temperature on the electrocatalytic performance of Ti/TiN_(x)/Mn_(2)O_(3)anode material for oxygen evolution was studied.The surface microscopic morphology and crystal structure of the Mn_(2)O_(3)catalytic layer of Ti/TiN_(x)/Mn_(2)O_(3)anode materials were analyzed by SEM,XRD,Raman,XPS and other characterization methods.The corrosion resistance and oxygen precipitation activity of the anode materials were analyzed by means of electrochemical tests,such as Tafel,LSV,constant current polarisation,EIS and ECSA.The results show that the sintering temperature has a strong influence on the surface microstructure,crystallinity,electrochemical corrosion resistance and electrocatalytic properties of Ti/TiN_(x)/Mn_(2)O_(3)anode materials.When the sintering temperature is 200℃,the Mn_(2)O_(3)catalytic layer on the surface of the anode material is compact,flat and has the best crystallinity.As the sintering temperature increases,more cracks are produced in the Mn_(2)O_(3)catalytic layer,while the contents of oxygen vacancies gradually decrease,Mn(Ⅳ)gradually increases,and the number of active sites on the surface of the electrode involved in the electrochemical reaction decreases significantly,which suppresses the oxygen precipitation kinetics.