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This study investigates the effect of economic policy uncertainty on the firm profitability through moderating role of logistics infrastructure index using US non-financial firms listed at NASDAQ.

We used secondary data set which includes firm-level indicators of 2,323 non-financial US firms listed at NASDAQ over the period of 1998–2018. Ordinary least squares regression with multiple fixed effects used to analyze the data and estimate hypotheses.

The results show that economic policy uncertainty negatively impacts the firm’s profitability whereas the logistics infrastructure positively moderates the negative impact of EPU on the firm’s profitability.

Economic policy uncertainty is a significant challenge for managerial decision making and a direct threat to a firm’s profitability. The results of this study imply that the state of logistics infrastructure must be considered as an important policy tool by the senior management to mitigate the negative impact of economic policy uncertainty and to safeguard a firm’s profitability.

This study highlights that logistic infrastructure plays an important role in alleviating the adverse effect of economic policy uncertainty on the profitability of a US non-financial firm.

This study explores the interplay between economic policy uncertainty (EPU) and corporate investment, with a focus on how corporate diversification influences this relationship based on a diverse sample of developed and emerging 22 countries firms from year 2000–2020 investment.

This study uses the ordinary least square regression method with year, industry, country fixed effect. Also, robustness tests including two stage least square, propensity score matching, subsampling analysis applied to support the main findings.

Grounded in the real options perspective and financial constraints theory, the research reveals that diversified firms mitigate the adverse impact of EPU on corporate investment. Empirical findings from a sample of listed firms across 22 countries (2000–2020) demonstrate that, during high EPU, companies generally limit investment, in line with the real options perspective. However, diversified firms show a reduced negative impact highlighting diversification’s moderating role. Notably, sub-sampling analysis indicates that the moderating impact of corporate diversification is more pronounced in developed economies than emerging economies with related diversification measure and vice versa with unrelated diversification measure.

This research highlights the strategic significance of corporate diversification in alleviating the effects of economic uncertainty, with implications for both developed and emerging economies’ firms’ strategic decision-makers.

Our study is the first which highlighted the role of corporate diversification between economic policy uncertainty and firm investment based on 22 emerging and developed economies from around the world.

The purpose of this paper is to investigate the chemical, optical and photovoltaic properties of titanium dioxide/reduced graphene oxide (TiO₂/rGO) photoanodes immersed in natural Roselle and synthetic (N719) dyes for dye-sensitized solar cell (DSSC) application.

TiO₂ mixed with rGO were doctor-bladed on fluorine doped tin oxide (FTO) glass substrate. The chemical and optical properties of TiO₂/rGO photoanodes immersed in Roselle and N719 dyes were characterized using Fourier-transformed infrared (FTIR) and ultraviolet–visible (UV–vis) spectroscopies, respectively. The DSSC’s photovoltaic performances were tested using Visiontec Solar I-V tester at standard illumination of AM1.5 and irradiance level of 100 mW/cm².

The presence of anthocyanin dye from Roselle flower was detected at 604 nm and 718 nm. TiO₂/rGO+Roselle dye sample revealed the smallest energy gap of 0.17 eV for ease of electron movement from valence band to conduction band. The TiO₂/rGO-based DSSC fabricated with Roselle dye had a power conversion efficiency, ƞ of 0.743 per cent higher than TiO₂/rGO photoanode sensitized with N719 dye (0.334 per cent). The obtained J-V curves were analyzed by a single-diode model of Lambert W-function and manual optimization to determine the internal electrical parameters of the DSSC. The average and uncertainty values of J_sc and ƞ were evaluated at different R_sh range of 1362 Ω to 32 k Ω.

R_s values were kept constant during optimization work.

New ideality factor of TiO₂/rGO-based DSSC was re-determined around 0.9995.