海胆针状金纳米颗粒用于电催化二氧化碳还原

Urchin-like Gold Nanoneedle for Efficient Electrocatalytic CO_(2) Reduction

采用不加表面活性剂的种子介导生长策略合成了具有针状结构的金纳米颗粒,其针尖处的尖端电场效应能有效富集电解质阳离子并提高二氧化碳局部浓度,从而提高催化剂的电流密度和一氧化碳选择性,在−0.6 V(vs.RHE)时的法拉第效率可以达到96%.电化学性能测试结果表明,其高选择性不仅来源于丰富的表面缺陷,更主要源于其独特的针状结构所带来的尖端电场效应.

Electrocatalytic CO_(2) reduction is one of the effective strategies to solve today’s energy and environmental crisis,in which reducing CO_(2) to CO is the first and the most critical step.However,the low solubility of CO_(2) in electrolyte greatly limits its reaction dynamics and product selectivity.In this work,a seed-mediated growth method without any surfactants was applied to synthesize gold nanoparticles with an urchin-like structure.The electric field at the tip of the needle can effectively enrich electrolyte cations and increase the local concentration of CO_(2),thereby increasing the current density and Faraday efficiency(FE_(CO))of the catalyst,which can reach 96%at−0.6 V(vs.RHE).Electrochemical performance tests have also shown that the high selectivity is attributed to its unique needle structure and surface defects.