Solar-driven CO 2 conversion is an attractive option for producing usable fuels and chemicals. However, traditionally synthesized TiO 2 materials suffer from the low activity of CO 2 conversion into multi-carbon products. Here, for the first time, strong magnetic fields were introduced into TiO 2 synthesis, and new TiO 2 {100} facets containing more active low-coordinate Ti atoms were developed. This is beneficial to the coupling of adsorbed CO*, which enables highly efficient CO 2 conversion into C 2 H 5 OH with a yield rate of 6.16 mmol g À1 h À1 .

As a multiple proton-coupled electron transfer process, photocatalytic conversion of CO2 usually produces a wide variety of products. Improving the yield and selectivity of CO2 to the single product is still a significant challenge. In this work, we describe that the rationally constructed W18O49/Cu2O­{111} interfaces achieve highly selective CO2 photocatalytic conversion to CH4. In situ Fourier transform infrared spectroscopy measurements reveal that the formation of W18O49/Cu2O­{111} interfaces restrains the desorption of CO* intermediates in CO2 photocatalytic conversion. UPS spectra, PL spectra, and photocurrent curves show that more photogenerated electrons are excited and transferred to W18O49/Cu2O­{111} interfaces. All of these play critical roles in CH4 production. As an outcome, the yield rate of CO2 photocatalytic conversion to CH4 was enhanced from 6.5 to 17.20 μmol g–1 h–1 with selectivity as high as 94.7%. The work demonstrates the feasibility and versatility of interface engineering in achieving highly selective CO2 photocatalytic conversion.

Amorphous Ni−Fe hydroxides (NiFe(OH) x ) are considered to possess promising potential as oxygen evolution reaction (OER) electrocatalysts, but amorphous NiFe(OH) x is hard to synthesize due to the complicated multistep synthesis process. Herein, amorphous NiFe(OH) x is successfully grown in situ on the surface of NiFe 2 O 4 via an ultrasonic-assisted reduction method. This method takes advantage of ultrasonic cavitation to achieve a unique reduction effect, migration of Ni and Fe cations of NiFe 2 O 4 to the crystal surface, and in situ growth of amorphous NiFe(OH) x , thereby forming a NiFe 2 O 4 /NiFe(OH) x composite. This material exhibits enhanced electrochemical performance with an overpotential of 276 mV at 10 mA cm −2 . The ultrasonic-assisted reduction method can be used to synthesize amorphous NiFe-(OH) x with no residual reactants, providing a simple and facile way to synthesize amorphous hydroxide materials.

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We regulated phosphorus vacancies in Co0.68Fe0.32P by Ar-plasma treatment, leading to a unique surface state.