Xinyue Liang,Bin Xiang,Xuefeng Zou,Feng Chen,Jiangyu Hao,Qin Hu,Wenpo Li
The poor cycling life hindered the progression of aqueous nickel-based batteries. Herein, a facile electrodeposition approach was employed to design a three-dimensional lamellar Bi anode (TL-Bi) on nickel foam with a long-term cycling stability for rechargeable aqueous Ni//Bi batteries. The areal capacity of the TL-Bi electrode was 0.19 mA h cm −2 at 4 mA cm −2 in a three-electrode system. Also, the fabricated Ni//Bi battery constituted through an as-obtained TL-Bi anode and a NiO cathode delivered an excellent power density specific capacity of 14.4 mW cm −2 and exceptional durability (retaining 94.1% after 4500 cycles) in an aqueous electrolyte. With the merits of safe and easy to operate, this simple available pressing method may inspire new development for reversible aqueous batteries.
Electroreduction of carbon dioxide into readily collectable and high-value carbon-based fuels is greatly significant to overcome the energy and environmental crises yet challenging in the development of robust and highly efficient electrocatalysts. Herein, a bismuth (Bi) heterophase electrode with enriched amorphous/crystalline interfaces was fabricated via cathodically in situ transformation of Bi-based metal-phenolic complexes (Bi-tannic acid, Bi-TA). Compared with amorphous or crystalline Bi catalyst, the amorphous/crystalline structure Bi leads to significantly enhanced performance for CO2 electroreduction. In a liquid-phase H-type cell, the Faraday efficiency (FE) of formate formation is over 90% in a wide potential range from −0.8 to −1.3 V, demonstrating a high selectivity toward formate. Moreover, in a flow cell, a large current density reaching 600 mA cm–2 can further be rendered for formate production. Theoretical calculations indicate that the amorphous/crystalline Bi heterophase interface exhibits a favorable adsorption of CO2 and lower energy barriers for the rate-determining step compared with the crystalline Bi counterparts, thus accelerating the reaction process. This work paves the way for the rational design of advanced heterointerface catalysts for CO2 reduction.
危险品化学品经营许可证（带存储）