Electrophotographic photoreceptor and image forming apparatus using the photoreceptor

An image forming apparatus comprising:

• an electrophotographic photoreceptor;
• a charger configured to charge the electrophotographic photoreceptor;
• a light irradiator configured to irradiate the photoreceptor with light to form an electrostatic latent image on the electrophotographic photoreceptor;
• an image developer configured to develop the electrostatic latent image with a developer comprising a toner to form a toner image on the electrophotographic photoreceptor
• a transfer configured to transfer the toner image onto a receiving material;
• and
• a fixer configured to fix the toner image on the receiving material,
• wherein the electrophotographic photoreceptor comprises a photosensitive layer on an electroconductive substrate, and wherein nitrate ion is present on a surface of the photosensitive layer in an amount of from 50 to 300 μg/m2.

A process cartridge for an image forming apparatus, comprising:

• a housing;
• and
• an electrophotographic photoreceptor contained in the housing,
• wherein the electrophotographic photoreceptor comprises a photosensitive layer on an electroconductive substrate, and wherein nitrate ion is present on a surface of the photosensitive layer in an amount of from 50 to 300 μg/m2.