Highly active PdSb catalysts on porous carbon for electrochemical oxidation reactions of biomass-derived C1–C3 alcohols

Abstract

The design of efficient and durable electrocatalysts is a challenge for development of direct alcohol fuel cells (DAFCs). Herein, highly active and stable PdSb nanoparticle catalysts that are supported on...

Surface Modification with F-Doped Carbon Layer Coating on Natural Graphite Anode for Improving Interface Compatibility and Electrochemical Performance of Lithium-Ion Capacitors

“…The Nyquist plots from EIS measurements with the equivalent circuit of Li-ion capacitors shown in Figure S7b verify that NG-F1 exhibited a semicircle with a smaller radius than NG, indicating a smaller R ct (77.074 Ω) than NG (109.651 Ω), resulting from the presence of the F-doped carbon coating layer facilitating the transport of charge carriers such as Li + ions and e – and enhancing the utilization of active materials. The slope of the Tafel plot can offer insights into the kinetics of electrochemical reactions through the equation η = b 0.25em log nobreak0em.25em⁡ i a − b 0.25em log nobreak0em.25em⁡ i o , b = 2.303 italicRT α F and a low slope value signifies high reaction kinetics. , The derived Tafel slope of NG-F1 (369.58 and 272.48 mV dec –1 ) stays smaller than that of NG (377.68 and 289.18 mV dec –1 ) during the first charging–discharging step after the formation step. Consequently, the F-doped carbon layer coating can accelerate the kinetics and the transportation of the charge carriers through voltage hysteresis, R ct , and Tafel slope.…”

“…The Nyquist plots from EIS measurements with the equivalent circuit of Li-ion capacitors shown in Figure S7b verify that NG-F1 exhibited a semicircle with a smaller radius than NG, indicating a smaller R ct (77.074 Ω) than NG (109.651 Ω), resulting from the presence of the F-doped carbon coating layer facilitating the transport of charge carriers such as Li + ions and e – and enhancing the utilization of active materials. The slope of the Tafel plot can offer insights into the kinetics of electrochemical reactions through the equation and a low slope value signifies high reaction kinetics. , The derived Tafel slope of NG-F1 (369.58 and 272.48 mV dec –1 ) stays smaller than that of NG (377.68 and 289.18 mV dec –1 ) during the first charging–discharging step after the formation step. Consequently, the F-doped carbon layer coating can accelerate the kinetics and the transportation of the charge carriers through voltage hysteresis, R ct , and Tafel slope.…”