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首页> 外文会议>International Symposium on Energy and Electrochemical Processes for a Cleaner Environment, 2001, San Francisco, CA >EFFECT OF THERMAL TREATMENT OF IrO_2 ANODE CATALYSTS FOR PEM WATER ELECTROLYSIS
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EFFECT OF THERMAL TREATMENT OF IrO_2 ANODE CATALYSTS FOR PEM WATER ELECTROLYSIS

机译：IrO_2阳极催化剂的热处理对PEM水电解的影响

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摘要

IrO_2 powders for use as anode catalysts for PEM water electrolysis cells, were prepared and then annealed at different temperatures and compared as oxygen evolving catalysts in a PEM cell. Best performance of the catalysts, at high current densities, was obtained when annealing at 490℃ for 8 hours. Here the best compromise between electrocatalytic activity i.e. the number of active points at the surface and the electrical conductivity, seems to be achieved. The electrical conductivity of the oxide catalyst is found to increase by increasing annealing temperature whereas the activity of the catalyst decreases at higher annealing temperatures. The importance of high electrical conductivity of the catalyst is emphasized and may be related to the geometry of the porous backing/current collector. The catalysts were studied in situ in a PEM cell by voltammetry, AC-impedance and stationary current density-potential measurements. Particle size and crystallinity were studied by transmission electron microscopy (TEM).
机译：制备了用作PEM水电解池阳极催化剂的IrO_2粉末，然后在不同温度下进行了退火，并与PEM池中的放氧催化剂进行了比较。在490℃退火8小时，可获得高电流密度下的最佳催化剂性能。此处似乎在电催化活性，即表面活性点的数量和电导率之间达到了最佳折衷。发现通过提高退火温度，氧化物催化剂的电导率增加，而在更高的退火温度下，催化剂的活性降低。强调了催化剂的高电导率的重要性，并且其可能与多孔背衬/集电器的几何形状有关。通过伏安法，交流阻抗和固定电流密度电位测量法在PEM电池中原位研究了这些催化剂。通过透射电子显微镜（TEM）研究了粒度和结晶度。

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