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论文类型：期刊论文

发表时间：2017-07-28

发表刊物：SCIENCE

收录刊物：Nature、Science、Cell期刊、SCIE、ESI高被引论文、Scopus

卷号：357

期号：6349

页面范围：389-+

ISSN号：0036-8075

摘要：The water-gas shift (WGS) reaction (where carbon monoxide plus water yields dihydrogen and carbon dioxide) is an essential process for hydrogen generation and carbon monoxide removal in various energy-related chemical operations. This equilibrium-limited reaction is favored at a low working temperature. Potential application in fuel cells also requires a WGS catalyst to be highly active, stable, and energy-efficient and to match the working temperature of on-site hydrogen generation and consumption units. We synthesized layered gold (Au) clusters on a molybdenum carbide (alpha-MoC) substrate to create an interfacial catalyst system for the ultralow-temperature WGS reaction. Water was activated over alpha-MoC at 303 kelvin, whereas carbon monoxide adsorbed on adjacent Au sites was apt to react with surface hydroxyl groups formed from water splitting, leading to a high WGS activity at low temperatures.