7 documents found, page 1 of 1
Iridium–Iron Diatomic Active Sites for Efficient Bifunctional Oxygen Electrocat...
Yu, Zhipeng; Si, Chaowei; LaGrow, Alec P.; Tai, Zhixin; Caliebe, Wolfgang A.; Tayal, Akhil; Sampaio, Maria J.; Sousa, Juliana P. S.; Amorim, IsildaDiatomic catalysts, particularly those with heteronuclear active sites, have recently attracted considerable attention for their advantages over single-atom catalysts in reactions involving multielectron transfers. Herein, we report bimetallic iridium−iron diatomic catalysts (IrFe−N−C) derived from metal−organic frameworks in a facile wet chemical synthesis followed by postpyrolysis. We use various advanced cha...
Bifunctional atomically dispersed ruthenium electrocatalysts for efficient bipo...
Yu, Zhipeng; Si, Chaowei; Escobar-Bedia, Francisco Javier; LaGrow, Alec P.; Xu, Junyuan; Sabater, Maria J.; Amorim, Isilda; Araujo, AnaAtomically dispersed catalysts (ADCs) have recently drawn considerable interest for use in water electrolysis to produce hydrogen, because they allow for maximal utilization of metal species, particularly the expensive and scarce platinum group metals. Herein, we report the electrocatalytic performance of atomically dispersed ruthenium catalysts (Ru ADCs) with ultralow Ru loading (0.2 wt%). The as-obtained Ru A...
Efficient hydrogen production by saline water electrolysis at high current dens...
Yu, Zhipeng; Xu, Junyuan; Meng, Lijian; Liu, LifengSeawater electrolysis powered by renewable energy sources has been proposed to be a potentially cost-effective approach to green hydrogen production. However, the long-standing issue regarding the chlorine evolution reaction (CER) that deteriorates the performance of electrocatalysts and other components of electrolyzers has been impeding the market adoption of direct seawater electrolyzers. Herein, we demonstr...
Bifunctional porous cobalt phosphide foam for high-current-density alkaline wat...
Li, Yue; Wei, Bin; Yu, zhipeng; Bondarchuk, Oleksandr; Araujo, Ana; Amorim, Isilda; Zhang, Nan; Xu, Junyuan; Neves, Isabel C.; Liu, LifengAlkaline water electrolysis is a cost-effective approach to hydrogen production, but it suffers from low operational current densities (typically ⤠500 mA cm-2) and thereby a low hydrogen production rate. Herein, we report the fabrication of self-supported porous cobalt phosphide (Co-P) foam by electrochemical anodization of commercially available cobalt foam, followed by thermal oxidation and subsequent phosp...
Conformal and continuous deposition of bifunctional cobalt phosphide layers on ...
Thalluri, Sitaramanjaneva Mouli; Borme, Jerome; Yu, Kang; Xu, Junyuan; Amorim, Isilda; Gaspar, João; Qiao, Liang; Ferreira, Paulo; Alpuim, P.Vertically aligned p-silicon nanowire (SiNW) arrays have been extensively investigated in recent years as promising photocathodes for solar-driven hydrogen evolution. However, the fabrication of SiNW photocathodes with both high photoelectrocatalytic activity and long-term operational stability using a simple and affordable approach is a challenging task. Herein, we report conformal and continuous deposition of...
Highly-ordered silicon nanowire arrays for photoelectrochemical hydrogen evolut...
Thalluri, Sitaramanjaneya Mouli; Borme, Jerome; Xiong, Dehua; Xu, Junyuan; Li, Wei; Amorim, Isilda; Alpuim, P.; Gaspar, Joao; Fonseca, HelderVertically-aligned, highly-ordered silicon nanowire (SiNW) array photocathodes are fabricated employing e-beam lithography followed by deep reactive ion etching (DRIE) of Si. The effect of structural parameters of SiNWs, including wire diameter, length and inter-wire spacing, on their photoelectrocatalytic hydrogen evolution performance has been systematically investigated. Within the range of dimensions under ...
Vapor–solid synthesis of monolithic single-crystalline CoP nanowire electrodes ...
Li, Wei; Gao, Xuefei; Xiong, Dehua; Xia, Fang; Liu, Jian; Song, Wei-Guo; Xu, Junyuan; Thalluri, Sitaramanjaneya Mouli; Cerqueira, M. F.; Fu, XiuliElectrochemical water splitting into hydrogen and oxygen is a promising technology for sustainable energy storage. The development of earth-abundant transition metal phosphides (TMPs) to catalyze the hydrogen evolution reaction (HER) and TMP-derived oxy-hydroxides to catalyze the oxygen evolution reaction (OER) has recently drawn considerable attention. However, most monolithically integrated metal phosphide el...