期刊
ELECTROCHIMICA ACTA
卷 110, 期 -, 页码 663-669出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.01.014
关键词
Palladium; Selectivity; Fuel cell; Hydrothermal synthesis; Core-shell; Carbon nanoparticle; Voltammetry; pH; Sensor
资金
- CSC (China Scholarship Council) [2010695033]
A nano-composite of negatively charged carbon nanoparticles (Emperor 2000 (TM)), chitosan, and nano-palladium is produced in a one-step hydrothermal process with oxalate reductant. In voltammetric measurements strong pH effects on capacitance and Faradaic current responses are observed due to chitosan forming a shell (or hydrothermal wrapping) around both carbon nanoparticles and palladium particles in the water-based hydrothermal process. In spite of the wrapping, some Pd-catalytic processes are observed, but with pH controlling the rate. The shell around Pd nanoparticles appears to only allow small molecule reactants such as H-2 and O-2 but not formic acid or methanol to reach the active catalyst surface. Membrane-transport limited and reaction-type limited catalytic electrochemical responses are observed with high selectivity. Implications of small molecule selectivity and mechanistic selectivity in suppressing cross-over losses in fuel cell technology are discussed. (C) 2013 Elsevier Ltd. All rights reserved.
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