Jihun Oh

Nanostructured Si eliminates several critical problems with Si photocathodes and dramatically improves a photoelectrochemical (PEC) reaction important to water-splitting. Our nanostructured black Si photocathodes improve the H2 production by providing (1) near-ideal anti-reflection that enables the absorption of most incident light and its conversion to photogenerated electrons and (2) extremely high surface area in direct contact with water that reduces the overpotential needed for the PEC hydr

Electrocatalytic CO₂ reduction is a promising way to provide renewable energy from gaseous CO₂ The development of nanostructures improves energy efficiency and selectivity for value-added chemicals, but complex nanostructures limit the CO₂ conversion rates due to poor mass transport during vigorous electrolysis. Herein, we propose a three-dimensional (3D) hierarchically porous Au comprising interconnected macroporous channels (200-300 nm) and nanopores (∼10 nm) f

Converting solar energy by photoelectrochemical water splitting has been regarded as a promising way to resolve the global energy crisis and alleviate environmental pollution. Silicon, which is earth-abundant and has a narrow band gap, is an attractive material for photoelectrochemical water splitting. However, Si-based photoelectrodes suffer from photocorrosion, which leads to instability in electrolytes and high overpotential. Herein, we have fabricated a metal–insulator–semiconductor structur

Abstract This study reports on substantial improvement of the open‐circuit voltage ( V oc ) of Cu 2 ZnSnSe 4 (CZTSe) thin film solar cells by applying a passivation strategy to both the top and bottom interfaces of the CZTSe absorber, which involves insertion of a thin dielectric layer between the CZTSe and the surrounding layers. The study also presents in‐depth material characterizations using transmission electron microscopy, energy dispersive X‐ray spectroscopy, low‐temperature photoluminesc

Morphology-controlled Au nanostructures are fabricated<italic>via</italic>electroreduction of anodized Au thin films, exhibiting efficient catalytic activity for electrochemical CO₂reduction.

The glycerol electro-oxidation reaction (GEOR) can economically convert glycerol, a byproduct of biodiesel production, to glycolic acid. Herein, nanostructured Au catalysts were fabricated on a Si substrate by the electrochemical reduction of anodic-treated (RA-treatment) Au films, which tuned the surface area from 1 to 16 cm2. Treatment of 0.1 M glycerol at 1.0 V (vs RHE) for 2 h in 1 M KOH solution afforded a glycerol conversion and glycolic acid selectivity of 50.9 and 47%, respectively. The

Cu acetate/PAN nanofibers were transformed into porous C nanofibers with doped N and Cu particles,<italic>via</italic>O₂partial pressure-controlled calcination. N atoms next to Cu trigger the CO₂RR by increasing the amount of CO* on the Cu, lowering the energy needed for CO dimerization.

The effect of local atomic arrangement of CuZn alloys was demonstrated on enhanced ethanol selectivity from CO 2 RR and supported by density functional theory (DFT) calculations.

The evaluation of catalysts on gas diffusion electrodes (GDEs) have propelled the progress of electrochemical CO2 reduction reaction (CO2RR) at industry-relevant activities. However, high experimental complexities exist in GDE-based flow electrolyzers, whereby various experimental factors can influence the evaluation of catalytic CO2RR performances. Not accounting for these experimental factors could result in inconsistent conclusions and thus hinder rational catalyst developments. This Perspect

A Ni single-atom catalyst with Ni–N4–xCx active sites is prepared in a single pyrolysis step in which the Ni single atom is incorporated in the carbon framework through nitrogen and carbon coordination utilizing the ionothermal synthesis method. In comparison to the complicated synthesis procedures of single-atom catalysts, this method provides a general and facile method to obtain single-atom catalysts with an opportunity to synthesize catalysts at a large scale. The precursors used in this met