Department of Chemistry, Stanford University, Stanford, California 94305, USA.
J Am Chem Soc. 2013 Jun 12;135(23):8452-5. doi: 10.1021/ja4027715. Epub 2013 May 28.
Highly active, durable, and cost-effective electrocatalysts for water oxidation to evolve oxygen gas hold a key to a range of renewable energy solutions, including water-splitting and rechargeable metal-air batteries. Here, we report the synthesis of ultrathin nickel-iron layered double hydroxide (NiFe-LDH) nanoplates on mildly oxidized multiwalled carbon nanotubes (CNTs). Incorporation of Fe into the nickel hydroxide induced the formation of NiFe-LDH. The crystalline NiFe-LDH phase in nanoplate form is found to be highly active for oxygen evolution reaction in alkaline solutions. For NiFe-LDH grown on a network of CNTs, the resulting NiFe-LDH/CNT complex exhibits higher electrocatalytic activity and stability for oxygen evolution than commercial precious metal Ir catalysts.
用于水氧化以产生氧气的高效、持久且具有成本效益的电催化剂是一系列可再生能源解决方案的关键，包括水分解和可充电金属-空气电池。在这里，我们报告了在轻度氧化的多壁碳纳米管（CNT）上合成超薄的镍铁层状双氢氧化物（NiFe-LDH）纳米板。铁掺入镍氢氧化物中诱导了 NiFe-LDH 的形成。纳米板形式的结晶 NiFe-LDH 相在碱性溶液中对氧气析出反应表现出高度的活性。对于生长在 CNT 网络上的 NiFe-LDH，所得的 NiFe-LDH/CNT 复合物在氧气析出反应中的电催化活性和稳定性均高于商业贵金属 Ir 催化剂。
