PEM水电解槽采用质子交换膜,隔绝电极两侧的气体,避免了碱性电解制氢隔膜气体易渗透的缺点。
PEM水电解槽以固体质子交换膜PEM为电解质,以纯水为反应物。由于PEM电解质氢气渗透率较低,产生的氢气纯度高,仅需脱除水蒸气,工艺简单,安全性高;电解槽采用零间距结构,欧姆电阻较低,显著提高电解过程的整体效率,且体积更为紧凑;压力调控范围大,氢气输出压力可达数兆帕,适应快速变化的可再生能源电力输入。
电解槽主要结构类似燃料电池电堆,分为膜电极、极板和气体扩散层。
为了从电解槽系统获得一定的氢气输出量,并且为了匹配商业电源电压,多个电池单元在PEM电解槽系统中串联堆叠。它们必须具有较低的电阻,在阳极和阴极室之间提供绝缘以避免气体混合,具有较高的机械和化学稳定性、流体分布,由于它们也有助于促进热传输,也需要具有较高的热传导性。
钛通常被认为是最先进的材料,因为它具有优良的强度,低电阻率,高导热率和低氢渗透性。但是钛容易被腐蚀,尤其在阳极侧,电位可能超过2V会导致表面氧化物的积累,从而增加接触电阻,降低导热系数。为了避免这种情况,我们利用在钛表面镀铂来降低表面电阻。
技术优势:
创新突破了大尺寸MW级抗冲刷、耐热冲击、高导电多孔扩散层镀铂涂层技术、MW级双极板耐腐蚀高导电高导热镀铂涂层处理技术,解决了电解堆中双极板和扩散层材料难题,成功应用于MW级电解堆并经受住了长寿命周期考验。
双极板和扩散层的电导率达到10mΩ·cm(@1.5Mpa),镀层厚度偏差≤±5%。
The PEM water electrolyzer uses a proton exchange membrane to isolate the gas on both sides of the electrode, avoiding the disadvantage that the gas of alkaline electrolytic hydrogen production diaphragm is easy to penetrate.
The PEM water electrolyzer uses solid proton exchange membrane PEM as the electrolyte and pure water as the reactant. Due to the low hydrogen permeation rate of PEM electrolyte, the generated hydrogen is of high purity and only water vapor needs to be removed, which makes the process simple and safe; the electrolyzer adopts a zero-pitch structure with low ohmic resistance, which significantly improves the overall efficiency of the electrolysis process and is more compact; the pressure regulation range is large, and the hydrogen output pressure can reach several megapascals, adapting to the rapidly changing renewable energy power input.
The main structure of the electrolyzer is similar to that of a fuel cell reactor, divided into membrane electrodes, pole plates and gas diffusion layers.
In order to obtain a certain amount of hydrogen output from the electrolyzer system and to match the commercial supply voltage, multiple cells are stacked in series in the PEM electrolyzer system. They must have low electrical resistance, provide insulation between the anode and cathode chambers to avoid gas mixing, have high mechanical and chemical stability, fluid distribution and, since they also help facilitate heat transfer, also need to have high thermal conductivity.
Titanium is often considered the most advanced material because of its excellent strength, low resistivity, high thermal conductivity and low hydrogen permeability. However, titanium is susceptible to corrosion, especially on the anode side, where potentials that may exceed 2 V can lead to the accumulation of surface oxides, which increases the contact resistance and reduces the thermal conductivity. To avoid this, we use platinum plating on the titanium surface to reduce the surface resistance.
Technical advantages:
Innovative breakthroughs in platinum plating coating technology for large size MW grade scour resistant, heat and shock resistant, highly conductive porous diffusion layer, and platinum plating coating treatment technology for MW grade bipolar plates with corrosion resistance, high conductivity and high thermal conductivity, solving the material problems of bipolar plates and diffusion layer in electrolytic stacks, successfully applied to MW grade electrolytic stacks and withstood the test of long life cycle.
The conductivity of bipolar plate and diffusion layer reaches 10mΩ-cm (@1.5Mpa), and the thickness deviation of plating layer is ≤±5%.
材质:钛
特点:刻蚀加工、版面平整度高、正反面流道可以定制不同图形
涂层:0.5um铂金镀层、高导电、高耐腐、耐高温、低流阻双极板
Material: titanium
Features: etching process, high flatness of the layout, front and back runners can be customized with different graphics
Coating: 0.5um platinum plating, high conductivity, high corrosion resistance, high temperature resistance, low flow resistance bipolar plate
钛双极板:
材质:钛
特点:刻蚀加工、版面平整度高、正反面流道可以定制不同图形
涂层:0.5um铂金镀层、高导电、高耐腐、耐高温、低流阻双极板
Material: titanium
Features: etching process, high flatness of the layout, front and back runners can be customized with different graphics
Coating: 0.5um platinum plating, high conductivity, high corrosion resistance, high temperature resistance, low flow resistance bipolar plate