CATALYST AND ANODE

• Main Authors: NAKAYAMA MASAHARU, INOHARA DAIJIRO, KUROKAWA HARUMI, KAKIHARA YASUO
• Format: Patent
• Language: English; Japanese
• Published: 11.07.2019
• Subjects: APPARATUS THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

To provide an inexpensive catalyst with high activity, which is included in an anode for generating oxygen by water electrolysis, contributing to the reduction of overvoltage of the anode in order to reduce power loss effectively.SOLUTION: A catalyst comprises a particle of geothite with the cobalt content 5-45 mol% of iron and Tafel's gradient 26-55 mV/dec. The average length of the longwise axis of the particle of geothite is 50-200 nm. The BET specific surface area is 100-300 m/g.EFFECT: The particle of geothite is inexpensive because of having little amount of expensive cobalt in comparison with a catalyst material such as ruthenium oxide, iridium oxide, or iron hydroxide included in the conventional catalysts, and has high activity with small Tafel's gradient.SELECTED DRAWING: None 【課題】水の電気分解により酸素を発生させるための陽極に含まれる触媒であって、電力損失を効果的に低減させるために、陽極の過電圧低下に大きく寄与する高活性かつ安価な触媒の提供。【解決手段】コバルトの含有量が鉄に対して５〜４５ｍｏｌ％のゲータイトの粒子であり、ターフェル勾配が２６〜５５ｍＶ／ｄｅｃである触媒。更に、ゲータイトの粒子の長軸の平均長さが５０〜２００ｎｍであり、そのＢＥＴ比表面積が１００〜３００ｍ２／ｇである、触媒。【効果】前記ゲータイトの粒子は、従来の触媒に含まれる酸化ルテニウムや酸化イリジウム、或いは鉄水酸化物などの触媒材料と比べて、高価なコバルトの量が少く安価であり、またターフェル勾配の値が小さく高活性である。【選択図】なし