Recently, the surface frustrated Lewis pairs (SFLP) have attracted more and more attention in the field of CO2 hydrogenation. The main research studies have focused on a single construction of SFLP; however, the exploration of the synergy between SFLP and other excellent techniques has been barely reported. In this work, a common photocatalyst, TiO2, was chosen as the research object and amorphous TiO2–x(OH)y and CuPt alloy were constructed on its surface to investigate the synergy between SFLP and the metal cocatalyst technique. The amorphous TiO2–x(OH)y could form effective SFLP to increase CO2 activation, and the CuPt alloy was beneficial for H2 dissociation to boost the formation of protonated/hydridic H. The synergy resulted in CuPt/TiO2–x(OH)y/TiO2 exhibiting significantly increased activity for the reverse water gas shift (RWGS) reaction compared to those of TiO2–x(OH)y/TiO2, CuPt/TiO2, and pristine TiO2. This work highlights an important research direction for the SFLP application in the field of CO2 hydrogenation.
The electrode material is vital for the performance of the electrochemical biosensor. Lately, many nanomaterials have been developed to improve the sensitivity and detection efficiency of the biosensors. In this work, a kind of one-dimensional nanomaterials, the CuPt alloy nanotubes with an open end (CuPt alloy NTs-AOE), was explored. The nanotubes with an open end can provide a larger electrochemical active surface area and more active sites for the immobilization of enzyme. The CuPt alloy displays excellent conductivity and catalytic activity. In addition, the Cu shows the great affinity to thio-compounds, which can greatly enhance the detection efficiency and sensitivity. As a result, the prepared biosensor demonstrates the wider linear range of 9.98 × 10−10–9.98 × 10–5 g l−1 for fenitrothion and 9.94 × 10−11–9.94 × 10–4 g l−1 for dichlorvos (as model OPs ) and with the lower detection limit of 1.84 × 10–10 g l−1 and 6.31 × 10–12 g l−1 (S/N = 3), respectively. Besides, the biosensor has been used to detect the real samples and obtains satisfactory recoveries (95.58%–100.56%).
It is challenging to synthesize oxygen reduction reaction (ORR) electrocatalysts that are highly efficient, affordable, and stable for use in proton exchange membrane fuel cells. To address this challenge, we developed a low platinum-loading (only 6.68% wt) ORR catalyst (PtCu1-NC), comprising CuPt nanoparticles (average size: 1.51 nm) supported on the N-doped carbon substrates. PtCu1-NC possesses a high specific surface area of 662 m2 g–1 and a hierarchical porous structure, facilitating efficient mass transfer. The synergistic effect from introduced copper and the electron effect from nitrogen modify the electronic structure of platinum, effectively accelerating the ORR reaction and enhancing stability. Density functional theory calculations demonstrate the catalytic mechanism and further verify the synergistic effect. Electrochemical assessments indicate that PtCu1-NC exhibits specific activity and mass activity 5.3 and 5.6 times higher, respectively, than commercial Pt/C. The half-wave potential is 27 mV more positive than that of commercial Pt/C. The electrochemical active surface area value is 104.3 m2 g–1, surpassing that of Pt/C. Approximately 78% of current is retained after 10,000 s chronoamperometry measurement. These results highlight the effectiveness of alloying in improving the catalyst performance.
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