Almost all research into what motivates people at work, including voluntary work, makes it clear that the best motivators are somehow linked to personal challenge and achievement. It seems that people are mostly motivated by recognition and positive reinforcement.
If you want to motivate people at work, set challenging and achievable goals and give feedback on progress. You might consider these “nine laws of motivation” as a guide to good practice:-
º You have to be motivated to motivate
º Everybody has a motivational fuse
º Motivation requires a goal
º Challenge only motivates if you can win
º Seeing potential for personal growth motivates
º Motivation requires recognition
º Participation motivates
º Group belonging motivates
º Motivation, once established, never lasts as the environment keeps changing.