Xu Peiman, Li Jingwei, Luo Jiaxian, Wei Licheng, Zhang Dawei, Zhou Dan, Xu Weiming, Yuan Dingsheng
School of Chemistry and Materials Science, Jinan University, Guangzhou, 510632, People's Republic of China.
Sci Rep. 2018 Jun 21;8(1):9425. doi: 10.1038/s41598-018-27477-z.
Earth-abundant and efficient bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are highly significant for renewable energy systems. However, the performance of existing electrocatalysts is usually restricted by the low electroic conductivity and the limited amount of exposed active sites. In this work, (FeNi)S tubular spheres supported on Ni foam have been prepared by a sulfuration of FeNi layered double hydroxide spheres grown on Ni foam. Benefiting from the unique tubular sphere architecture, the rich inner defects and the enhanced electron interactions between Fe, Ni and S, this electrocatalyst shows low overpotential of 48 mV for HER at 10 mA cm in 1.0 mol L KOH solution, which is one of the lowest value of non-previous electrocatalyts for HER in alkaline electrolyte. Furthermore, assembled this versatile electrode as an alkaline electrolyzer for overall water splitting, a current density of 10 mA cm is achieved at a low cell voltage of 1.56 V, and reach up to 30 mA cm only at an operating cell voltage of 1.65 V.
用于析氢反应（HER）和析氧反应（OER）的储量丰富且高效的双功能电催化剂对于可再生能源系统具有极其重要的意义。然而，现有电催化剂的性能通常受到低电导率和暴露活性位点数量有限的限制。在这项工作中，通过对生长在泡沫镍上的FeNi层状双氢氧化物球体进行硫化，制备了负载在泡沫镍上的（FeNi）S管状球体。受益于独特的管状球体结构、丰富的内部缺陷以及Fe、Ni和S之间增强的电子相互作用，这种电催化剂在1.0 mol L KOH溶液中，在10 mA cm下HER的过电位低至48 mV，这是碱性电解质中HER的非先前电催化剂的最低值之一。此外，将这种多功能电极组装成用于全水解的碱性电解槽，在1.56 V的低电池电压下实现了10 mA cm的电流密度，仅在1.65 V的工作电池电压下就达到了30 mA cm。
