  In this paper, we aim to examine the electric Penrose process (PP) around a
charged black hole in 4D Einstein-Gauss-Bonnet (EGB) gravity and bring out the
effect of the Gauss-Bonnet (GB) coupling parameter $\alpha$ and black hole
charge on the efficiency of the energy extraction from the black hole. This
research is motivated by the fact that electrostatic interactions significantly
influence the behavior of charged particles in the vicinity of a charged static
black hole. Under this interaction, decaying charged particles can have
negative energies, causing energy to be released from black holes with no
ergosphere. We show that the GB coupling parameter has a significant impact on
the energy efficiency of the electric PP, but the efficiency can be strongly
enhanced by the black hole charge due to the Coulomb force. Finally, we
consider the accretion disk around the black hole and investigate in detail its
radiation properties, such as the electromagnetic radiation flux, the
temperature, and the differential luminosity. We show that the GB coupling
parameter can have a significant impact on the radiation parameters, causing
them to increase in the accretion disk in the vicinity of the black hole.
Interestingly, it is found that the 4D EGB charged black hole is more efficient
and favorable for the accretion disk radiation compared to a charged black hole
in Einstein gravity.
