Fabrication of Pd Nanocubes@CdIF-8 catalysts for highly efficient electrocatalytic sensing of H2O2 and high-performance supercapacitor

In this work, the Pd@Cd(2-methylimidazole)(2) (Pd@CdIF-8) was synthesized by two facile methods, in which the original cubic Pd nanoparticles anchored on the surface/interface of CdIF-8 and supported on the acidified activated carbon (AAC). Interestingly, CdIF-8 exhibited sphericity under hydrothermal condition and presented hexahedron under mild liquid. A(B)-Pd(x)CdyIF-8@AAC hybrids are researched by FESEM, TEM, contact angle measurement, XPS, XRD and BET analytical techniques. A(B)-PdxCdyIF-8@AAC hybrids are employed as nonenzymatic sensors for electrochemical detection of H2O2, and both exhibited excellent electrocatalytic activity, especially for A(B)-Pd0.2Cd1.5IF-8@AAC/GCE sensors. A(B)-Pd0.2Cd1.5IF-8@AAC/GCE sensors demonstrated a linear response to H2O2 in the range of from 10 mu M to 10.2 mM and 2 mu M to 17.5 mM, the sensitivity of 0.195 mu A mu M-1 and 0.266 mu A mu M-1, respectively. In addition, asymmetric supercapacitors have been fabricated using A(B)Pd(x)CdyIF-8@AAC hybrids as positive electrode and exhibited exceptional electrochemical properties with high specific capacitance (452 F g(-1) at 0.05 A g(-1) and 372 F g(-1) at 1 A g(-1) of A-Pd0.2Cd1.5IF-8@AAC, and 502 F g(-1) at 0.05 A g(-1) and 395 F g(-1) at 1 A g(-1) of B-Pd0.2Cd1.5IF-8@AAC), excellent stability (83.579% maintenance of specific capacitance at 5 A g(-1) of A-Pd0.2Cd1.5IF-8@AAC and 78.313% maintenance of B-Pd0.2Cd1.5IF-8@AAC), respectively. (c) 2019 Published by Elsevier Ltd.