Data_Sheet_1_Co(OH)2 Nanosheets Supported on Laser Ablated Cu Foam: An Efficient Oxygen Evolution Reaction Electrocatalyst.PDF

Highly efficient and low-cost non-noble metal based electrocatalysts for oxygen evolution reaction (OER) have attracted more and more attention in recent years. However, the current research has been focused on the construction of novel OER electrocatalysts themselves, little attention has been paid to the modification of the substrates. In this work, a different strategy is proposed via laser ablation to fabricate the Cu foams with rich micro/nano-structures as OER substrates. Later, the precipitation conversion method was utilized to grow cobalt hydroxide on the laser fabricated Cu foams. The as-produced Cu/Cu oxides/Co(OH)2 electrocatalysts exhibit high OER activity in 1 M KOH, requiring an overpotential of only 259 mV at a current density of 50 mA cm−2 with excellent mild-term durability. The improved catalytic performance of the prepared samples can be attributed to the increased surface area, rich active sites, and the superhydrophilicity of the laser produced micro/nano-structures.

近年来，用于析氧反应（oxygen evolution reaction, OER）的高效低成本非贵金属基电催化剂受到了学界的广泛关注。然而，当前的研究多聚焦于新型OER电催化剂本身的构建，对基底改性的关注却相对不足。本研究提出了一种差异化策略：通过激光烧蚀制备具备丰富微纳结构的铜泡沫，并将其用作OER反应基底。随后，采用沉淀转化法在激光制备的铜泡沫表面生长氢氧化钴。所制备的铜/铜氧化物/Co(OH)₂电催化剂在1 mol/L KOH电解液中展现出优异的OER催化活性：在50 mA·cm⁻²的电流密度下仅需259 mV的过电位，且具备优异的中期耐久性。该样品催化性能的提升，可归因于激光制备的微纳结构带来的比表面积增大、丰富的活性位点以及超亲水性优势。