HYDROGEN ELECTRODE FOR WATER VAPOR ELECTROLYSIS

• Main Authors: SAKAI SHINGO, MORIKAWA AKIRA, FUJITA SATORU, HITOMI TAKUMA
• Format: Patent
• Language: English; Japanese
• Published: 08.12.2022
• Subjects: APPARATUS THEREFOR; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; CONCRETE; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; INORGANIC CHEMISTRY; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

To provide a hydrogen electrode for water vapor electrolysis where electron conductivity decreases a little even when exposed to a high-temperature water vapor.SOLUTION: A hydrogen electrode for water vapor electrolysis includes an active layer. The active layer is composed of a cermet containing a Ni-containing particle and an ACZ particle composed of a complex oxide (ACZ) of A2O3 (where A=Y, La, and/or Sc), CeO2, and ZrO2. An average value of a grain diameter of the ACZ particle is 0.071 μm or more and 2.5 μm or less. In the ACZ particle, a standard deviation of the grain diameter is preferably 0.35 μm or less. An electrode for water vapor electrolysis is further preferably provided with a diffusion layer formed on a surface on a separator side of the active layer.SELECTED DRAWING: Figure 8 【課題】高温の水蒸気に曝されても電子伝導性の低下が少ない水蒸気電解用水素極を提供すること。【解決手段】水蒸気電解用水素極は、活性層を含む。前記活性層は、Ｎｉ含有粒子と、Ａ2Ｏ3（但し，Ａ＝Ｙ、Ｌａ、及び／又は、Ｓｃ）、ＣｅＯ2及びＺｒＯ2の複合酸化物（ＡＣＺ）からなるＡＣＺ粒子とを含むサーメットからなる。前記ＡＣＺ粒子は、粒径の平均値が０．０７１μｍ以上２．５μｍ以下である。前記ＡＣＺ粒子は、粒径の標準偏差が０．３５μｍ以下であるものが好ましい。水蒸気電解用電極は、前記活性層のセパレータ側表面に形成された拡散層をさらに備えているものでも良い。【選択図】図８