TY - JOUR
T1 - A simple fabrication route of porous palladium/palladium oxide/carbon nanostructures using one-step combustion waves for high-performance pH sensors
AU - Seo, Byungseok
AU - Hwang, Hayoung
AU - Park, Seonghyun
AU - Choi, Wonjoon
N1 - Funding Information:
This work was supported by the Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program ( 10080611 ), and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (Grant no. 20173010032170 ).
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/11/20
Y1 - 2018/11/20
N2 - Reduction-oxidation controls and synthesis of organic-inorganic hybrid structures are key features associated with their electrochemical properties. However, they involve bulky setup and long-time processes that incur high-cost. Herein, we report one-step combustion waves (CWs) for the fabrication of hybrid-porous palladium/palladium oxides/carbon (Pd/PdxOy@C) nanostructures with controllable atomic composition and their application as a high-performance pH sensor. Hybrid composites of Pd/formaldehyde (FA)/nitrocellulose (NC) were prepared as precursors. Self-propagating CWs through the NC networks carried out the transformation from Pd to PdO2 in the higher oxidation state and the formation of a carbon layer, while the fast release of chemicals in CWs developed the porous nanostructures with large surface areas. The flexible pH sensor using the synthesized Pd/PdxOy@C powders exhibited the outstanding specific voltage potential (2.08 V/mg at pH 2.83) and sensitivity (167 mV/mg pH). It showed no hysteresis during cycling of pH values and high stability over 4 h (voltage change <0.89%). The high oxidation states and conductive carbon layers of Pd/PdxOy@C with large surface areas improved the specific potential and the stability in minute changes of pH values and forward-reverse proton exchanges. The physicochemical synthesis using CWs would contribute to developing scalable processing for electrochemical applications, including chemical sensors.
AB - Reduction-oxidation controls and synthesis of organic-inorganic hybrid structures are key features associated with their electrochemical properties. However, they involve bulky setup and long-time processes that incur high-cost. Herein, we report one-step combustion waves (CWs) for the fabrication of hybrid-porous palladium/palladium oxides/carbon (Pd/PdxOy@C) nanostructures with controllable atomic composition and their application as a high-performance pH sensor. Hybrid composites of Pd/formaldehyde (FA)/nitrocellulose (NC) were prepared as precursors. Self-propagating CWs through the NC networks carried out the transformation from Pd to PdO2 in the higher oxidation state and the formation of a carbon layer, while the fast release of chemicals in CWs developed the porous nanostructures with large surface areas. The flexible pH sensor using the synthesized Pd/PdxOy@C powders exhibited the outstanding specific voltage potential (2.08 V/mg at pH 2.83) and sensitivity (167 mV/mg pH). It showed no hysteresis during cycling of pH values and high stability over 4 h (voltage change <0.89%). The high oxidation states and conductive carbon layers of Pd/PdxOy@C with large surface areas improved the specific potential and the stability in minute changes of pH values and forward-reverse proton exchanges. The physicochemical synthesis using CWs would contribute to developing scalable processing for electrochemical applications, including chemical sensors.
KW - Carbon coating
KW - Chemical potential
KW - Combustion synthesis
KW - High oxidation state
KW - Palladium oxide
KW - pH sensor
UR - http://www.scopus.com/inward/record.url?scp=85050864158&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2018.07.142
DO - 10.1016/j.snb.2018.07.142
M3 - Article
AN - SCOPUS:85050864158
SN - 0925-4005
VL - 274
SP - 37
EP - 46
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
ER -